passbyvalueandpassbyreference.c

#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   
}