C program to reverse a number using loops

In this article, we will discuss the concept of the C program to reverse a number using loops

In this post, we are going to learn how to find reverse number of the given number in C programming language

C code to reverse a number using for loop

Program 1

The program allows the user to enter a number and it displays the reverse pattern of the given number using for loop in C language

when you are entered 45678,
The output will be displayed as 87654

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int num,rem,reverse=0;
    printf("Enter a number for find reverse\n");
    scanf("%d",&num);
    printf("You entered %d\n",num);
    for(;num!=0; num=num/10){
        rem=num%10;
        reverse=reverse*10+rem;
    }
    printf("Reverse of the given number %d",reverse);
    getch();
    return 0;
}

When the above code is executed, it produces the following result

Explanation

Declare and initialize three variables as follows int num,rem,reversed_Num=0;
The user is asked to enter a number and it is stored in the integer variable of ‘num‘
The for loop is used to find the reversed number of the given number
The for loop is functioning until ‘ num’ is not equal to zero
Finally, the output is displayed as the reversed number

C code to reverse a number using while loop

Program 2

The program allows the user to enter a number and it displays the reverse pattern of the given number using while loop in C language

when you are entered 13579,
The output will be displayed as 97531

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int num,reverse=0,rem;
    printf("Enter a number for find reverse\n");
    scanf("%d",&num);
    printf("You entered %d\n",num);
    while(num!=0){
        rem=num%10;
        reverse=reverse*10+rem;
        num/=10;
    }

    printf("Reverse number %d\n",reverse);
    getch();
    return 0;
}

When the above code is executed, it produces the following result

Explanation

Declare and initialize three variables as follows int num,rem,reversed_Num=0;
The user is asked to enter a number and it is stored in the integer variable of ‘num‘
The while loop is used to find the reversed number of the given number
The while loop is functioning until ‘ num‘ is not equal to zero
Finally, the output is displayed as the reversed number

C code to reverse a number using do-while loop

Program 3

The program allows the user to enter a number and it displays the reverse pattern of the given number using do-while loop in C language

when you are entered 54321
The output will be displayed as 12345

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int num,reverse=0,rem;
    printf("Enter a number for find reverse\n");
    scanf("%d",&num);
    printf("You entered %d\n",num);
    do{
        rem=num%10;
        reverse=reverse*10+rem;
        num/=10;
    }while(num!=0);

    printf("Reverse number %d\n",reverse);
    getch();
    return 0;
}

When the above code is executed, it produces the following result

Explanation

Declare and initialize three variables as follows int num,rem,reversed_Num=0;
The user is asked to enter a number and it is stored in the integer variable of ‘num‘
The do-while loop is used to find the reversed number of the given number
The do-while loop is functioning until ‘ num‘ is not equal to zero
Finally, the output is displayed as the reversed number

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Do while loop in C language

C program to reverse a number using loops

C program to reverse a number using loops