Practical File of C Language

1. 1
1. //Wap to print simple message.
#include<stdio.h>
#include<conio.h>
void main()
{
printf(" Get Well Soon");
clrscr();
getch();
}
Output:-

2. 2
2. //Wap to add two numbers .
#include<stdio.h>
#include<conio.h>
void main()
{
int a,b,c;
clrscr();
printf("enter the values of a and b");
scanf("%d%d",&a,&b);
c=a+b;
printf("sum=%d",c);
getch();
}
Output:-

3. 3
3. //Wap to calculate average of 5 numbers.
#include<stdio.h>
#include<conio.h>
void main()
{
int a,b,c,d,e,avg;
clrscr();
printf("enter the values of a, b, c, d, and e");
scanf("%d%d%d%d%d",&a,&b,&c,&d,&e);
avg=(a+b+c+d+e)/5;
printf("avg=%d",avg);
getch();
}
Output:-

4. 4
4. //Wap to multiply three numbers
#include<stdio.h>
#include<conio.h>
void main()
{
int a=5,b=8,c=6,d;
clrscr();
d=a*b*c;
printf("mul=%d",d);
getch();
}
Output:-

5. 5
5. //Wap to print area of a circle.
#include<stdio.h>
#include<conio.h>
void main()
{
int r;
float pie=3.14;
float area;
printf("Enter the value of r");
scanf("%d",&r);
area=(pie*r*r);
printf("Area=%f",area);
getch();
}
Output:-

6. 6
6. //Wap to print the biggestof three numbers
#include<stdio.h>
#include<conio.h>
void main()
{
int a,b,c;
clrscr();
printf("Enter the values of a,b,and c");
scanf("%d%d%d",&a,&b,&c);
if (a>b&&a>c)
{
printf(" A is Biggest");
}
if (b>a&&b>c)
{
printf("Bis Biggest");
}
if (c>a&&c>b)
{
printf("Cis Biggest");
}
getch();
}

7. 7
Output:-

8. 8
7. //Wap to check givennumber is even or odd.
#include<stdio.h>
#include<conio.h>
void main()
{
int a;
clrscr();
printf("enter the value of a");
scanf("%d",&a);
if(a%2==0)
{
printf("Number is Even");
}
else
{
printf("Number is Odd");
}
getch();
}
Output:-

9. 9
8. //Wap to check givennumber is positive or negative.
#include<stdio.h>
#include<conio.h>
void main()
{
int a;
clrscr();
printf("enter the value of a");
scanf("%d",&a);
if (a>0)
{
printf("Number is Positive");
}
else
{
printf("Number is Negative");
}
getch();
}

10. 10
9. //Wap to check givenyear is leap year or not?
#include<stdio.h>
#include<conio.h>
void main()
{
int a;
printf("Enter tha value of a");
scanf("%d",&a);
if (a%4==0)
{
printf("This year is Leap Year");
}
else
{
printf("This is not Leap Year");
}
getch();
}
Output:-

11. 11
10. //Wap to print the name of day according to user
choice.
#include<stdio.h>
#include<conio.h>
void main()
{
int day;
clrscr();
printf("Enter the value for day 1 to 7");
scanf("%d",&day);
if (day==1)
{
printf("n Monday");
}
else if (day==2)
{
printf("n Tuesday");
}
else if (day==3)
{
printf("n Wednesday");
}
else if (day==4)
{

12. 12
printf("n Thursday");
}
else if (day==5)
{
printf("n Friday");
}
else if (day==6)
{
printf("n Saturday");
}
else if (day==7)
{
printf("n Sunday");
}
else
{
printf("PleaseEnter Correct Value");
}
getch();
}

13. 13
11. //Wap to print the name of month.
#include<stdio.h>
#include<conio.h>
void main()
{
int month;
clrscr();
printf("Enter the value for month 1 to 12");
scanf("%d",&month);
switch (month)
{
case 1:
printf("January");
break;
case 2:
printf("Febuary");
break;
case 3:
printf("March");
break;
case 4:
printf("April");
break;
case 5:

14. 14
printf("May");
break;
case 6:
printf("June");
break;
case 7:
printf("July");
break;
case 8:
printf("August");
break;
case 9:
printf("September");
break;
case 10:
printf("October");
break;
case 11:
printf("November");
break;
case 12:
printf("December");
break;
default:

15. 15
printf("PleaseEnter Correct Value");
break;
}
getch();
}
Output:-

16. 16
12. //Wap to print 1 to 10 no by while loop
#include<stdio.h>
#include<conio.h>
void main()
{
int i=1;
clrscr();
while(i<=10)
{
printf("n %d",i);
i++;
}
getch();
}
Output:-

17. 17
13. //Wap to print 1 to 10 Numbers by using do while.
#include<stdio.h>
#include<conio.h>
void main()
{
int i=1;
clrscr();
do
{
printf("n %d",i);
i++;
}while(i<=10);
getch();
}
Output:-

18. 18
14. //Wap to print 1 to 10 by using for loop
#include<stdio.h>
#include<conio.h>
void main()
{
int i;
clrscr();
for(i=1;i<=10;i++)
{
printf("n %d",i);
}
getch();
}
Output:-

19. 19
15. //Wap to calculate factorial of a given number.
#include<stdio.h>
#include<conio.h>
void main()
{
int n,i,fact=1;
clrscr();
printf("Enter the value of n");
scanf("%d",&n);
for(i=n;i>=1;i--)
{
fact=fact*i;
}
printf("Factorialis=%d",fact);
getch();
}
Output:-

20. 20
16. //Wap to print the fibonacci series.
#include<stdio.h>
#include<conio.h>
void main()
{
int n,i,a=0,b=1,c;
clrscr();
printf("Enter the term of fibonacci series");
scanf("%d",&n);
printf("%d%d",a,b);
for(i=1;i<n;i++)
{
c=a+b;
printf("%d",c);
a=b;
b=c;
}
getch();
}
Output:-

21. 21
17. //Wap to print the table of given no.
#include<stdio.h>
#include<conio.h>
void main()
{
int n,i;
clrscr();
printf("Enter a Number");
scanf("%d",&n);
for(i=1;i<=10;i++)
{
printf("n %d*%d=%d",n,i,n*i);
}
getch();
}
Output:-

22. 22
18. //Wap to print reverse of a number.
#include<stdio.h>
#include<conio.h>
void main()
{
int num,n,rev=0,rem;
clrscr();
printf("Enter the Number");
scanf("%d",&num);
n=num;
while(n!=0)
{
rem=n%10;
n=n/10;
rev=rev*(10+rem);
}
printf("Old Number=%d",num);
printf("Reversed NO=%d",rev);
getch();
}
Output:-

23. 23
19. //Wap to print given number is armstrong or not?
#include<stdio.h>
#include<conio.h>
void main()
{
int num,n,rem,sum=0;
clrscr();
printf("Enter a Number");
scanf("%d",&num);
n=num;
while(n!=0)
{
rem=n%10;
sum=sum+(rem*rem*rem);
n=n/10;
}
if (sum==num)
{
printf("n Number is Armstrong");
}
else
{
printf("n Number is not Armstrong");
}

24. 24
getch();
}
Output:-

25. 25
20. //Wap to print odd numbers between 1 to 50.
#include<stdio.h>
#include<conio.h>
void main()
{
int i=1;
while(i<=50)
{
if(i%2!=0)
printf("n %d",i);
i++;
}
getch();
}
Output:-

26. 26
21. //Wap to check given number is palindrome or not?
#include<stdio.h>
#include<conio.h>
void main()
{
int n,rem,rev=0,num;
clrscr();
printf("Enter a Number");
scanf("%d",&n);
num=n;
while(n!=0)
{
rem=n%10;
n=n/10;
rev=((rev*10)+rem);
}
if(num==rev)
{
printf("Entered Number is palindrome");
}
else
{
printf("Entered Number is not Palindrome");
}

27. 27
getch();
}
Output:-

28. 28
22. //Wap to add two numbers using Functions.
#include<stdio.h>
#include<conio.h>
int sum(int,int);
void main()
{
int a,b,c;
printf("enter the values of a and b");
scanf("%d%d",&a,&b);
c=sum(a,b);
printf("sum=%d",c);
getch();
}
int sum(intx,int y)
{
int z;
z=x+y;
return z;
}
Output:-

29. 29
23. //Wap to calculate the factorial of given number.
#include<stdio.h>
#include<conio.h>
void main()
{
int n,result;
clrscr();
printf("Enter the value of n");
scanf("%d",&n);
result=fact(n);
printf("factorial=%d",result);
getch();
}
int fact(int x)
{
if (x==0)
{
return(1);
}
else
{
return(x*fact(x-1));
}
}

30. 30
Output:-

31. 31
24. //Wap to print the fibonacci series.
#include<stdio.h>
#include<conio.h>
int fib(int m);
void main()
{
int n,i;
clrscr();
printf("Enter the term of fibonacci series");
scanf("%d",&n);
printf("n0");
for(i=1;i<=n;i++)
printf("n &d",fib(i));
getch();
}
int fib(int m)
{
static int a=0,b=1;
int c;
return(0);
if(m==1)
return(1);
else
{

32. 32
c=a+b;
a=b;
b=c;
return(c);
}
Output:-

33. 33
25. //Wap to calculate simple interest.
#include<stdio.h>
#include<conio.h>
void main()
{
int p,t,r;
int splint;
clrscr();
printf("Enter the value of p r and t");
scanf("%d%d%d",&p,&r,&t);
splint=(p*r*t/100);
printf("Splint=%d",splint);
getch();
}
Output:-

34. 34
26. //Wap to show concept of function no argument
and with return.
#include<stdio.h>
#include<conio.h>
int mul();
void main()
{
int result;
result =mul();
printf("Multiplication=%d",result);
getch();
}
int mul()
{
int a,b,c;
printf("Enter the value of a and b");
scanf("%d%d",&a,&b);
c=a*b;
return c;
}

35. 35
27. //Wap to show the concept of function with
argument and NO return.
#include<stdio.h>
#include<conio.h>
void sub(int,int);
void main()
{
int a,b;
clrscr();
printf("Enter the value of a and b");
scanf("%d%d",&a,&b);
sub(a,b);
getch();
}
void sub(intx,int y)
{
int z; z=x-y;
printf("Result=%d",z);
}
Output:-

36. 36
28.//Wapto show concept of function with no argument
no return
#include<stdio.h>
#include<conio.h>
void display();
void programinfo();
void main()
{
clrscr();
display();
programinfo();
display();
getch();
}
void display()
{
int i;
for(i=1;i<=20;i++)
printf("*");
printf("n");
}
void programinfo()
{
printf(" No ArgumentNO Return n");

37. 37
}
Output:-

38. 38
29. //Wap to swap two numbers using call by value.
#include<stdio.h>
#include<conio.h>
void swap(int,int);
void main()
{
int a,b;
clrscr();
printf("Enter the value of a and b");
scanf("%d%d",&a,&b);
swap(a,b);
getch();
}
void swap(intx,int y)
{
int z;
z=x; x=y; y=z;
printf("%d%d",x,y);
}
Output:-

39. 39
30. //Wap to swap two no by call by reference.
#inclu30.de<stdio.h>
#include<conio.h>
void swap(int*,int *);
void main()
{
int a,b;
clrscr();
printf("Enter the value of a and b");
scanf("%d%d",&a,&b);
swap(&a,&b);
getch();
}
void swap(int*x, int *y)
{
int z; z=*x; *x=*y; *y=z;
printf("%d %d",*x,*y);
}
Output:-

40. 40
31. //Wap to print input elements using One-D array.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[20],n,i;
printf("Enter Array Size");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("Enter the value of Elements %d",i);
scanf("%d",&a[i]);
}
printf("Array Elemnets are");
for(i=0;i<n;i++)
{
printf("n %d",a[i]);
getch();
}
Output:-

41. 41
32. //Wap to find the maximum value fromarray.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[50],i,n,max;
printf("Enter the array size");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("n Enter the values of elements %d",i);
scanf("%d",&a[i]);
}
max=a[50];
for(i=0;i<n;i++)
{
if(max<a[i])
{
max=a[i];
}
}
printf("Maximumvalue=%d",max);
getch()
}

42. 42
Output:-

43. 43
33. //Wap to find the minimum value fromarray.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[50],i,n,min;
printf("Enter the array size");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("n Enter the values of elements %d",i);
scanf("%d",&a[i]);
}
min=a[0];
for(i=0;i<n;i++)
{
if(min>a[i])
{
min=a[i];
}
}
printf("Minimumvalue=%d",min);
getch();
}

44. 44
Output:-

45. 45
34. //Wap to print the sum of all array elements.
#include<stdio.h>
#include<conio.h>
void main()
{
int s[50],i,n,sum=0;
clrscr();
printf("Enter the array size");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("n Enter sum of student %d",i);
scanf("%d",&s[i]);
sum=sum+s[i];
}
{
printf("Sumof Student=%d",sum);
}
Output:-

46. 46
35. //Wap to print input elements using Two-D array.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[5][5],j,i,r,c;
clrscr();
printf("Enter row and column size");
scanf("%d%d",&r,&c);
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
printf("Enter the value of Elements %d%d:",i,j);
scanf("%d",&a[i][j]);
}
}
printf("Array Elemnets are");
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
printf("n %d",a[i][j]);
}

47. 47
printf("n");
}
getch();
}
Output:-

48. 48
36. //Wap to add two matrices.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[5][5],b[5][5],c[5][5];
int i,j,r,col;
clrscr();
printf("Enter the row and column size");
scanf("%d%d",&r,&col);
printf("n Enter the values of firstmatrix");
for(i=0;i<r;i++)
{
for(j=0;j<col;j++)
{
printf("n Enter the values of elements %d%d",i,j);
scanf("%d",&a[i][j]);
}
}
printf("n Enter the values of second matrix");
for(i=0;i<r;i++)
{
for(j=0;j<col;j++)

49. 49
{
printf("n Enter the values of elements %d%d",i,j);
scanf("%d",&b[i][j]);
}
}
for(i=0;i<r;i++)
{
for(j=0;j<col;j++)
{
c[i][j]=0;
c[i][j]=a[i][j]+b[i][j];
}
}
printf("n After Addition n");
for(i=0;i<r;i++)
{
for(j=0;j<col;j++)
{
printf("%dt",c[i][j]);
}
printf("n");
}
getch();
}

50. 50
Output:-

51. 51
37. //Wap to multiply two matrices.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[5][5],b[5][5],c[5][5];
int i,j,r,col;
clrscr();
printf("Enter the row and column size");
scanf("%d%d",&r,&col);
printf("n Enter the values of firstmatrix");
for(i=0;i<r;i++)
{
for(j=0;j<col;j++)
{
printf("n Enter the values of elements %d%d",i,j);
scanf("%d",&a[i][j]);
}
}
printf("n Enter the values of second matrix");
for(i=0;i<r;i++)
{
for(j=0;j<col;j++)
{

52. 52
printf("n Enter the values of elements %d%d",i,j);
scanf("%d",&b[i][j]);
}
}
for(i=0;i<r;i++)
{
for(j=0;j<col;j++)
{
c[i][j]=0;
c[i][j]=a[i][j]*b[i][j];
}
}
printf("n After Multiplication n");
for(i=0;i<r;i++)
{
for(j=0;j<col;j++)
{
printf("%dt",c[i][j]);
}
printf("nn");
}
getch();
}

53. 53
Output:-

54. 54
38. //Wap to subtract two matrices.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[5][5],b[5][5],c[5][5];
int i,j,r,col;
clrscr();
printf("Enter the row and column size");
scanf("%d%d",&r,&col);
printf("n Enter the values of firstmatrix");
for(i=0;i<r;i++)
{
for(j=0;j<col;j++)
{
printf("n Enter the values of elements %d%d",i,j);
scanf("%d",&a[i][j]);
}
}
printf("n Enter the values of second matrix");
for(i=0;i<r;i++)
{
for(j=0;j<col;j++)
{

55. 55
printf("n Enter the values of elements %d%d",i,j);
scanf("%d",&b[i][j]);
}
}
for(i=0;i<r;i++)
{
for(j=0;j<col;j++)
{
c[i][j]=0;
c[i][j]=a[i][j]-b[i][j];
}
}
printf("n After Subtraction n");
for(i=0;i<r;i++)
{
for(j=0;j<col;j++)
{
printf("%dt",c[i][j]);
}
printf("n");
}
getch();
}

56. 56
Output:-

57. 57
39. //Wap to Transpose a matrix.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[5][5],i,j,r,c;
clrscr();
printf("Enter the row and column size");
scanf("%d%d",&r,&c);
printf("n Enter the values of firstmatrix");
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
printf("n Enter the values of elements %d%d",i,j);
scanf("%d",&a[i][j]);
}
}
printf("n After Transposen");
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
printf("%dt",a[i][j]);

58. 58
}
printf("n");
}
getch();
}
Output:-

59. 59
40. //Wap to print diagonal elements of a matrix.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[5][5],i,j,r,c;
clrscr();
printf("Enter the row and column size");
scanf("%d%d",&r,&c);
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
printf("n Enter the values of elements %d%d",i,j);
scanf("%d",&a[i][j]);
}
}
printf("n Diagonal Elements are n");
for(i=0;i<j;i++)
{
for(j=0;j<c;j++)
{
if(i==j)
{

60. 60
printf("%dt",a[i][j]);
}
}
}
getch();
}
Output:-

61. 61
41. //Wap to print sum of diagonal elements of a
matrix.
#include<stdio.h>
#include<conio.h>
void main()
{
int a[5][5],i,j,r,c,sum=0;
clrscr();
printf("Enter the row and column size");
scanf("%d%d",&r,&c);
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
printf("n Enter the values of elements %d%d",i,j);
scanf("%d",&a[i][j]);
}
}
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
if(i==j)
{

62. 62
sum+=a[i][j];
}
}
printf("n Sum of DiagonalElements are=%d",sum);
getch();
}

63. 63
42. //Wap to calculate % in four subjects And show
rollno of students.
#include<stdio.h>
#include<conio.h>
structstudent
{
int rollno;
float sub1,sub2,sub3,sub4,per;
};
void main()
{
struct students1;
clrscr();
printf("Enter the info for students");
printf("n Enter the roll no for student:");
scanf("%d",&s1.rollno);
printf("Enter the marks for sub1,sub2,sub3,sub4");
scanf("%f%f%f%f",&s1.sub1,&s1.sub2,&s1.sub3,&s1.sub4);
s1.per=(s1.sub1+s1.sub2+s1.sub3+s1.sub4)/400*100;
printf("Info for student");
printf("n Roll no of Student=%d",s1.rollno);
printf("n Percentage of student=%f",s1.per);
getch();

64. 64
}
Output:-

65. 65
43. //Wap to print record of a school student.
#include<stdio.h>
#include<conio.h>
structstudent
{
int rollno;
int age;
char name;
float marks,sub1,sub2,per;
};
void main()
{
struct students1;
clrscr();
printf("Enter the info for students");
printf("n Enter the Name of student:");
scanf("%s",&s1.name);
printf("n Enter the roll no for student:");
scanf("%d",&s1.rollno);
printf("Enter the Age of student:");
scanf("%d",&s1.age);
printf("Enter the marks for sub1,sub2");
scanf("%f%f",&s1.sub1,&s1.sub2);

66. 66
s1.per=(s1.sub1+s1.sub2)/200*100;
printf("Info for student");
printf("n Name of student %s",s1.name);
printf("n Roll no of Student=%d",s1.rollno);
printf("n Age of student:%d",s1.age);
printf("n Marks of sub1 and sub2 of student:%f %f",s1.sub1,s1.sub2);
printf("n Percentage of student=%f",s1.per);
getch();
}
Output:-

67. 67
44. //Wap to print record of students using union.
#include<stdio.h>
#include<conio.h>
union student
{
int rollno;
char name[20];
int age;
float marks; } s;
void main() {
printf("Enter RollNo of Student :");
scanf("%d",&s.rollno);
printf("Enter the age of student :");
scanf("%d",&s.age);
printf("Enter the name of student:");
scanf("%s",&s.name);
printf("Enter the marks of student :");
scanf("%f",&s.marks);
printf("n RollNo=%d",s.rollno);
printf("n age=%d",s.age);
printf("n Name=%s",s.name);
printf("n marks=%f",s.marks);
getch();
}

68. 68
45. //Wap to print address & value of variable and
address of pointer variable.
#include<stdio.h>
#include<conio.h>
void main()
{
int * ptr;
int a=10;
clrscr();
ptr=&a;
printf("n %d",a);
scanf("%ld",&ptr);
printf("%ld",*ptr);
printf("n %ld",*ptr);
printf("n %ld",&a);
getch();
}
Output:-

69. 69
46. //Wap to show the concept of pointer to pointer.
#include<stdio.h>
#include<conio.h>
void main()
{
int ** ptr;
int * p;
int a=10;
clrscr();
p=&a;
ptr=&p;
printf("n Value of a=%d",a);
printf("n Address of p=%ld",&p);
printf("n Value of p=%ld",p);
printf("n Content of a through p=%d",*p);
printf("n Address of p through ptr=%ld",ptr);
printf("n Content of a through ptr=%d",**ptr);
getch();
}

70. 70
47. //Wap to show use of auto variable.
#include<stdio.h>
#include<conio.h>
void func1();
void main()
{
func1();
func1();
}
void func1()
{
auto int i=2;
printf("%dn",i);
i=i+2;
getch();
}
Output:-

71. 71
48. //Wap to show use of static variable.
#include<stdio.h>
#include<conio.h>
int func1();
int func2();
main()
{
static int i=1;
printf("%d",i);
printf("n%d",func1());
printf("n%d",func2()); }
int func1() {
static int i;
i=i+2;
return(i); }
int func2()
{
static int i;
i=i+3;
return(i);
getch(); }
Output:-

72. 72
49. //Wap to show use of external variable.
#include<stdio.h>
#include<conio.h>
int i=1;
int func1();
int func2();
void main()
{
printf("%d",i);
printf("n%d",func1());
printf("n%d",func2());
}
int func1()
{
i=i+10;
return(i);
}
int func2()
{
i=i+20;
return(i);
getch();
}

73. 73
Output:---

74. 74
50. //Wap to enter a mixed data into a file.
#include<stdio.h>
#include<conio.h>
void main()
{
FILE*fp;
int rollno;
char name[20];
float marks;
fp=fopen("stud.txt","w");
clrscr();
if(fp==NULL)
{
printf("Cannotopen file");
}
printf("Enter student name,rollno,marks");
scanf("%s %d %f",name,&rollno,&marks);
fprintf(fp,"%s %d %f",name,rollno,marks);
fclose(fp);
getch();
}

75. 75
Output:-
Output:-

76. 76
51. //Wap to read a mixed data froma file.
#include<stdio.h>
#include<conio.h>
void main()
{
FILE*fp;
int rollno;
char name[20];
float marks;
fp=fopen("stud.txt","r");
clrscr();
if(fp==NULL)
{
printf("Cannotopen file");
}
while(fscanf(fp,"%s %d %f",name,&rollno,&marks)!=EOF)
{
printf("%s %d %f",name,rollno,marks); }
fclose(fp);
getch(); }
Output

77. 77
52. //Wap to enter a string data into a file.
#include<stdio.h>
#include<conio.h>
void main()
{
FILE*fp;
char s[80];
fp=fopen("xyz.txt","w");
if(fp==NULL)
{
printf("Cannotopen file");
}
printf("Enter string data and press enter");
while((strlen(gets(s))>0))
{
fputs(s,fp);
fputs("n",fp);
}
close(fp);
}

78. 78
Output:-
Output:-

79. 79
53. //Wap to read a string data from a file.
#include<stdio.h>
#include<conio.h>
void main()
{
FILE*fp;
char s[80];
clrscr();
fp=fopen("xyz.txt","r");
if(fp==NULL)
{
printf("Cannotopen file");
}
while(fgets(s,80,fp)!=NULL)
puts(s);
fclose(fp);
getch();
}
Output:-

80. 80
54. //Wap to write integer into a file.
#include<stdio.h>
#include<conio.h>
void main()
{
FILE*fp;
int n;
fp=fopen("raj.txt","w");
clrscr();
if(fp==NULL)
{
printf("Cannotopen file");
}
printf("Enter any integar value");
scanf("%d",&n);
putw(n,fp);
fclose(fp);
getch();
}

81. 81
Output:-
Output:-

82. 82
55. //Wap to read integer into a file.
#include<stdio.h>
#include<conio.h>
void main()
{
FILE*fp;
int n;
fp=fopen("raj.txt","w");
clrscr();
if(fp==NULL)
{
printf("Cannotopen file");
}
while((n=getw(fp))!=EOF)
{
printf("%d",n);
}
fclose(fp);
getch(); }
Output:-