Develop a C program to swap two integer values using (i). call by value (ii). Call by reference

Code

call by value

#include <stdio.h>
void swap(int, int); //prototype of the function
int main()
{
    int a = 10;
    int b = 20;
    printf("Before swapping the values in main a = %d, b = %d\n", a, b); // printing the value of a and b in main
    swap(a, b);
    printf("After swapping values in main a = %d, b = %d\n", a, b); // The value of actual parameters do not change by changing the formal parameters in call by value, a = 10, b = 20
}
void swap(int a, int b)
{
    int temp;
    temp = a;
    a = b;
    b = temp;
    printf("After swapping values in function a = %d, b = %d\n", a, b); // Formal parameters, a = 20, b = 10
}

output



call by reference

#include <stdio.h>
void swap(int *, int *); //prototype of the function
int main()
{
    int a = 10;
    int b = 20;
    printf("Before swapping the values in main a = %d, b = %d\n", a, b); // printing the value of a and b in main
    swap(&a, &b);
    printf("After swapping values in main a = %d, b = %d\n", a, b); // The values of actual parameters do change in call by reference, a = 10, b = 20
}
void swap(int *a, int *b)
{
    int temp;
    temp = *a;
    *a = *b;
    *b = temp;
    printf("After swapping values in function a = %d, b = %d\n", *a, *b); // Formal parameters, a = 20, b = 10
}

output


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