C Programming
Reverse number program in C
In this C program to reverse number article we will make some program which will take integer as the input from user and print the reverse of that number.
If a user gives the integer 123 then the program will print the output as 321. We can do such program in several way. Let’s see some example program of reverse a number using C.
Reverse number program
// reverse number program in C
#include<stdio.h>
int main(){
int num, rem, revNum = 0;
printf("Enter an integer to reverse it : ");
scanf("%d", &num);
while(num != 0){
rem = num % 10;
revNum = (revNum * 10) + rem;
num /= 10;
}
printf("\nReversed number is = %d\n",revNum);
return 0;
}Output of this reverse number program:
Reverse number program using recursion in C
// reverse number program using recursion in C
#include <stdio.h>
long revNum(long num){ // function to reverse number
static long rem = 0;
if (num == 0){
return 0;
}
rem = rem * 10;
rem = (num % 10) + rem;
revNum(num / 10);
return rem;
}
int main(){
long number, reminder;
printf("Enter the number : ");
scanf("%ld", &number);
reminder = revNum(number);
printf("\nReverse number is = %ld\n", reminder);
return 0;
}See output of reverse number program:
Previous page: Swap number
Next page: Decimal to binary