Call by Value and Call by Reference

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Prakash nidhi Verma · Answer

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.and 
void swap(int x, int y)and { 
and and and int z;
and and and z = x;
and and and x = y;
and and and y = z;
and and and printf("Swapped values are a = %d and b = %d", x, y);
and }
int main (int argc, char *argv[])
{
and and and int a = 10, b = 6;
and and and printf("Original values are a = %d and b = %d", a, b);
and and and swap(a, b);
and and and 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:and 
instead of passing values to the function by a pointers to the original variables are passed this method known as call by reference method.and 
void swap(int *x, int *y)and {
and and and int z;
and and z = *x;
and and and *x = *y;
and and and *y = z;
and and and printf("Swapped values are a = %d and b = %d", *x, *y);
}
int main (int argc, char *argv[])
{
and and and int a = 10, b = 6;
and and and printf("Original values are a = %d and b = %d", a, b);
and and and swap(anda, andb);
and and and printf("The values after swap are a = %d and b = %d", a, b);
and }
- push address of b
- push address of a
- save return address
- call function

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Call by Value and Call by Reference

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