1. Collection of program<br />Program to print double pyramid<br />void main(void){clrscr();int i,j,k,l,b,n;printf(quot;
Enter the value of N:quot;
);scanf(quot;
%dquot;
,&n);for(i=0;i{printf(quot;
quot;
);for(l=0;lprintf(quot;
quot;
);for(j=i+1;j<=n;j++)printf(quot;
%dquot;
,j);for(k=n-1;k>i;k--)printf(quot;
%dquot;
,k);}b=n-1;for(i=0;i{printf(quot;
quot;
);for(l=n-2;l>i;l--)printf(quot;
quot;
);for(j=b;j<=n;j++)printf(quot;
%dquot;
,j);for(k=n-1;k>=b;k--)printf(quot;
%dquot;
,k);b--;}getch();}<br />WAP to print fabbonic series from 1 to 55<br />void main ()<br />{<br />int a,b,c;<br />clrscr ();<br />a=0;b=1;c=1;<br />printf (quot;
%d%dquot;
,a,b);<br />while (c<55)<br />{<br />c=a+b;<br />printf (quot;
%dquot;
,c);<br />a=b;<br />b=c;<br />}<br />getch ();<br />}<br />factorial<br />#include quot;
stdio.hquot;
#include quot;
conio.hquot;
long int factorial(int n);void main(){int n,i;float s,r;char c;clrscr();repeat : printf(quot;
You have this series:- 1/1! + 2/2! + 3/3! + 4/4!quot;
);printf(quot;
To which term you want its sum? quot;
);scanf(quot;
%dquot;
,&n);s=0;for (i=1;i<=n;i++){s=s+((float)i/(float)factorial(i));}printf(quot;
The sum of %d terms is %fquot;
,n,s);fflush(stdin);printf (quot;
Do you want to continue?(y/n):- quot;
);scanf(quot;
%cquot;
,&c);if (c=='y')goto repeat;getch();}long int factorial(int n){if (n<=1)return(1);elsen=n*factorial(n-1);return(n);} <br />//C Program to Print Square of Stars#include<stdio.h>#include<conio.h>void main(){int a,b;clrscr();for(a=1;a<=3;a++){for (b=1;b<=a;b++){if(a==2&&b==2){printf(quot;
quot;
);}else{printf(quot;
*quot;
);}}for(b=(3-a);b>=1;b--){printf(quot;
*quot;
);}printf(quot;
quot;
);}getch();}<br />/*c program for printing Pascal's Triangle*/#include <stdio.h>#include <conio.h>void main(){int p[10][10];int i,j,k;clrscr();printf(quot;
Pascal's Trianglequot;
);for(i=0;i<10;i++){j=1;p[i][0]=1;p[i][i]=1;while(j<i){p[i][j]=p[i-1][j-1]+p[i-1][j];j++;}}for(i=0;i<10;i++){j=10;while(j>i){printf(quot;
quot;
);j--;}for(k=0;k<=i;k++){printf(quot;
%4dquot;
,p[i][k]);}printf(quot;
quot;
);}getch();}<br />//C Program to Round Up a Number#include<stdio.h>#include<conio.h>void main(){float n;int i;clrscr();printf(quot;
Enter the Valuequot;
);scanf(quot;
%fquot;
,&n);i=(n<0)?n-0.5:n+0.5;printf(quot;
Round up value= %dquot;
,i);getch();}<br />Fuuny program<br />#include<stdio.h>#include<conio.h>void main(){char ch[]=quot;
I AM AN IDIOT.quot;
;char c='A';int i=0;while(c){c=getch();printf(quot;
%cquot;
,ch[i]);i++;if(i==14){printf(quot;
quot;
); i=0;}}}<br />http://free-c-programs.blogspot.com<br />by ujjwal kaushik<br />