This document discusses variables, their scope, and types of scope. It defines a variable as a storage location with a name that can contain a value. Scope refers to the visibility and accessibility of a variable. There are two main types of scope: global scope means a variable declared outside of any function can be accessed from anywhere, and local scope means a variable declared inside a function is only accessible within that function. Examples are provided to illustrate global and local variables. The document also notes that local variables must be initialized while global variables are initialized by the system.

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5. WELCOME

6. Scope of variables
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7. Content
• Variables
• Scope
• Types of scopes

8. What is a variable?
• A storage location and an associated symbolic name.
• Contain some quantity of info, a value.
• Variable name is the usual way to reference the stored value.
• Its value may change during execution.

9. What is its scope?
• It refers visibility of variables.
• In other words, which parts of your program can see
or use it.

10. Types of scope
• Global scope.
• Local scope.

11. Global variables
• Declared outside all functions.
• Every part of your program can access.

12. example
#include<stdio.h>
int a, b,answer; // Global variables
int main()
{
a = 5; b = 7; `
answer=a+b;
printf("%dn",answer);
}

13. Local variable
• a variable that is declared inside a function.
• limit a variable's scope to a single function.
• changes inside the function can't affect the main
program.

14. example
#include<stdio.h>
int main()
{
int a, b,answer; // locall variables
a = 5; b = 7;
printf("%dn",answer);
}

15. example
• Example program using global and local variables:
#include<stdio.h>
// Global variables
int a;
int b;
int Add()
{
return a + b;
}
int main()
{
int answer; // Local variable
a = 5; b = 7;
answer = Add();
printf("%dn",answer);
return 0;
}

16. When trying access a local variable outside the
function?
• It will leads to syntax error.
Example:
#include<stdio.h>
int Add()
{
return a + b;
}
int main()
{
int a,b,answer; // Local variable
a = 5; b = 7;
answer = Add();
printf("%dn",answer);
return 0;
}

17. Initializing Local and Global Variables
when you define them as follows:
Local variable Global variables
• must be initialized by the programmer. • initialized automatically by the system.
Data Type Initial Default Value
int 0
char '0'
float 0
double 0
pointer NULL

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