Tag: circular shift

Given three variables x, y, z write a function to circularly shift their values to right. In other words if x = 5, y = 8, z = 10, after circular shift y = 5, z = 8, x = 10. Call the function with variables a, b, c to circularly shift values.

Analyze The Above Problem Statement

1. We need to write a function which receives 3 numbers.
2. Inside the function we need to swap the values of 3 variables circularly to the right.

i.e., value of x to y, value of y to z, and value of z to a.

Related Read:
Basics of Pointers In C Programming Language
Swap 2 Numbers Using a Temporary Variable: C

Very Important Note:

Any address preceded by a * (Indirection operator) will fetch the value present at that address.

Video Tutorial: C Program To Shift Variable Values Circularly To Right

Source Code: C Program To Shift Variable Values Circularly To Right

#include<stdio.h>

void shift_right(int*, int*, int*);

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

    printf("Enter 3 numbers\n");
    scanf("%d%d%d", &x, &y, &z);

    printf("Before shifting right: x = %d, y = %d and z = %d\n", x, y, z);

    shift_right(&x, &y, &z);

    printf("After shifting right: x = %d, y = %d and z = %d\n", x, y, z);

    return 0;
}

void shift_right(int *a, int *b, int *c)
{
    int temp;

    temp = *c;
    *c   = *b;
    *b   = *a;
    *a   = temp;
}

Output 1:
Enter 3 numbers
5
8
10
Before shifting right: x = 5, y = 8 and z = 10
After shifting right: x = 10, y = 5 and z = 8

Output 2:
Enter 3 numbers
2
3
1
Before shifting right: x = 2, y = 3 and z = 1
After shifting right: x = 1, y = 2 and z = 3

Logic To Shift Variable Values Circularly To Right

We ask the user to enter 3 numbers and store it inside the address of variables x, y and z. Now we pass these 3 address to the function shift_right();

Inside shift_right() function
Inside shift_right() function we shift the value present at *c to a temp variable. Then, we shift the value of *b to *c, then the value of *a to *b, and then we shift the value present in temp to *a. This shifts the values of variables x, y and z circularly to the right.

*a has the value present at the address &x;
*b has the value present at the address &y;
*c has the value present at the address &z;

int temp;

temp = *c;
*c = *b;
*b = *a;
*a = temp;

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