Example: C Program Swap Numbers in Cyclic Order using Call by Reference using Function

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// C Program Swap Numbers in Cyclic Order using Call by Reference using Function
#include <stdio.h>

void swapCycle(int *p, int *q, int *r);

// It's the driver function
int main() {
    int p, q, r;
    // p, q & r - denotes the input numbers to swap in cyclic order
    
    printf("-----Enter the three numbers one by one-----\n");
    scanf("%d %d %d", &p, &q, &r);

    printf("\n-----Values before swapping the numbers-----\n");
    printf("p = %d \nq = %d \nr = %d\n", p, q, r);

    swapCycle(&p, &q, &r);

    printf("\n\n-----Values after swapping the numbers-----\n");
    printf("p = %d \nq = %d \nr = %d\n", p, q, r);
    return 0;
}

// This function will swap the numbers itself
void swapCycle(int *x, int *y, int *z) {
    int temp;
    // swapping in cyclic order
    temp = *y;
    *y = *x;
    *x = *z;
    *z = temp;
}