Programming

void main()
{
    int a=10;
     int b=20;
    swapr(a++,b++);
    printf("%d %d",a,b);
}
 swapr (int *x,int *y)
{
    x+=2;
    y+=3;
}

void swapr (int *x,int *y);

//shoule be return int,your style is old-fashioned
int main()
{
	int a=10;
	int b=20;
	//swapr needs two parameters of int *,it's a address.
	//C's reference means to use pointer.
	swapr(&a,&b);
	printf("%d %d",a,b);
}

//also,return value
void swapr (int *x,int *y)
{	
	//if you wanna change the values of x and y
	*x+=2;
	*y+=3;
}

#include <iostream.h>
void swapr (int * x,int * y);
//shoule be return int,your style is old-fashioned
int main()
{
    int a=10;
    int b=20;
    //swapr needs two parameters of int *,it's a address.
    //C's reference means to use pointer.
    swapr(&a , &b);
    cout <<a << "   "  << b;
    return 0;
}
//also,return value
void swapr (int * a,int * b)
{
 
//just fr your swapr to work
      * a= * a + * b;
      * b= * a - * b;
      * a= * a - * b;
}