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1 Answers

Prakash nidhi Verma
Prakash nidhi Verma 17 Jul 2018
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Call by value:

the called function creates a new set of variables in stack is called call by value whch is copies the values of the arguments into method. 

void swap(int x, int y) 
{ 

     int z;

     z = x;

     x = y;

     y = z;

     printf("Swapped values are a = %d and b = %d", x, y);

 }
	 

int main (int argc, char *argv[])

{

     int a = 10, b = 6;

     printf("Original values are a = %d and b = %d", a, b);

     swap(a, b);

     printf("The values after swap are a = %d and b = %d", a, b);

}

- push value of b

- push value of a

- save return address

- call function

Call by reference: 

instead of passing values to the function by a pointers to the original variables are passed this method known as call by reference method. 

void swap(int *x, int *y) 
{

     int z;

    z = *x;

     *x = *y;

     *y = z;

     printf("Swapped values are a = %d and b = %d", *x, *y);

}

int main (int argc, char *argv[])

{

     int a = 10, b = 6;

     printf("Original values are a = %d and b = %d", a, b);

     swap(&a, &b);

     printf("The values after swap are a = %d and b = %d", a, b);

 }

- push address of b

- push address of a

- save return address

- call function

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