5.1.2 Scope of C Variables

• Which variable can be used in a place where a variable can be used. 
• This happens to his scope. 
• According to Scope, variables have been divided into 2 categories.

1. Local Variables
2. Globle variables

❖ Local Variable :-

• Local variables are those variables that are defined in a small block of the program such as function, control statement block etc. 
• Such variables are used only by the same block.
• Like if you have created a variable in any function, then you can not use that variable outside of that function.

#include<stdio.h>

using namespace std;

void myFunction();

int main()

{

int num=10;

myFunction();

printf("Num in main() : %d", num);

return 0;

}

void myFunction()

{

/* local variable num */

int num= 6;

printf("Num in myFunction : %dn",num);

}

OUTPUT

Num in myFuntion() : 6 Num in main() : 10

❖ Global Variables :-

• Global variables are variables that are scope in the whole program. 
• These variables allow you to access any of the entire program. 
• These variables are defined at the beginning of the program.

#include<stdio.h>

/* A global variable */

int num=10;

void myFunction();

int main()

{

myFunction();

printf("Num in main() : %d",num);

return 0;

}

void myFunction()

{

printf("Num in myFunction : %dn",num);

}

OUTPUT

Num in myFunction() : 10 Num in main() : 10