Call by Address: C Programming

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  Call by Address

                  

When we use call by value machanism actually we pass the address of variable. Hence if we change the value of variable in called function will also effect the original value in calling function. The concept of pointer is used in call by address mechanism.

Ex.

void show(int *,int *);

                void main()

{

int a,b;

printf("Enter two no.");

scanf("%d%d",&a,&b);

printf("Before calling:-%d%d",a,b);

show(&a,&b);

printf("After Calling:-%d%d",a,b);

 } 

void show(int *a, int *b)

 {

 printf("In called function:-\n");

*a=*a+5;

*b=*b+10;

printf("Modified value=%d%d",*a,*b);

} 

Output:-

Enter two no     10 20

 Before calling:-10 20

In called function

Modified value=15 30

After calling:-15 30

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