//* Passing by pointer compared to passing by reference *
#include <stdio.h>

void SwapBad(int a, int b) {
    int t;
    t = a;
    a = b;
    b = t;
}

/*    *** does not exist in C ***
void SwapRef(int &a, int &b) {
    int t;
    t = a;
    a = b;
    b = t;
}
*/

void SwapPtr(int *a, int *b) {
    int t;
     t = *a;
    *a = *b;
    *b =  t;
}



int main() {
    int x, y, z;

    printf("Please enter three values to start testing\n");
    scanf("%d %d %d", &x, &y, &z);
    printf("E  : %d %d %d\n", x, y, z);
    SwapBad(x,y);
    printf("SB1: %d %d %d\n", x, y, z);
    SwapBad(y,z);
    printf("SB2: %d %d %d\n", x, y, z);
/*    *** does not exist in C ***
    SwapRef(x,y);
    printf("SR1: %d %d %d\n", x, y, z);
    SwapRef(y,z);
    printf("SR2: %d %d %d\n", x, y, z);
*/
    SwapPtr(&x,&y); // use & when * is used function-side!!!
    printf("SP1: %d %d %d\n", x, y, z);
    SwapPtr(&y,&z);
    printf("SP2: %d %d %d\n", x, y, z);


    return(0);
}