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C > Recursion Code Examples

C Program to Solve Tower-of-Hanoi Problem using Recursion

C Program to Solve Tower-of-Hanoi Problem using Recursion

This C Program uses recursive function & solves the tower of hanoi. The tower of hanoi is a mathematical puzzle. It consists of threerods, and a number of disks of different sizes which can slideonto any rod. The puzzle starts with the disks in a neat stack in ascending order of size on one rod, the smallest at the top. We have to obtain the same stack on the third rod.

    #include <stdio.h>

    void towers(int, char, char, char);

    int main()

    {

        int j;

        printf("Enter the number of disks : ");

        scanf("%d", &j);

        printf("The sequence of moves involved in the Tower of Hanoi are :\n");

        towers(j, 'A', 'C', 'B');

        return 0;

    }

    void towers(int j, char frompeg, char topeg, char auxpeg)

    {

        if (j == 1)

        {

            printf("\n Move disk 1 from peg %c to peg %c", frompeg, topeg);

            return;

        }

        towers(j - 1, frompeg, auxpeg, topeg);

        printf("\n Move disk %d from peg %c to peg %c", j, frompeg, topeg);

        towers(j - 1, auxpeg, topeg, frompeg);

    }

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