This post contains a total of 11+ Hand-Picked C Programs to Reverse a Number with Source Codes. All the programs are made using C Programming Language.
You can use the source code of these programs for educational purpose with credits to the original owner.
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1. By Mahesh Khatri
Made by Mahesh Khatri. Program to reverse a input number. Enter your number in n = 385. ( Source )
Reversed Number = 583
#include <stdio.h>
int main() {
int n, reversedNumber = 0, rem;
n = 385;
while(n != 0) {
rem = n % 10;
reversedNumber = reversedNumber * 10 + rem;
n /= 10;
}
printf("Reversed Number = %d", reversedNumber);
return 0;
}2. By Thanigai Velan
Made by Thanigai Velan. Simple C Program to reverse a number. ( Source )
5757 The reverse of the number is 7575
#include <stdio.h>
int main()
{
int r=0;
int n;
scanf("%d",&n);
while(n>0)
{
r=r*10;
r=r+n%10;
n=n/10;
}
printf("The reverse of the number is %d",r);
return 0;
}3. By vaibhav
Made by vaibhav. Program to accept any number and print it in reverse using recursive function. ( Source )
Enter an integer : 7345 reverse of integer is 5437
#include <stdio.h>
int reverse(int);
int main ()
{
int n , rev;
scanf("%d",&n);
printf("Enter an integer : %d\n",n);
rev = reverse(n);
printf("reverse of integer is %d",rev);
return 0;
}
int reverse (int n)
{
static int new=0;
if(n == 0)
return new;
else {
new = ((new*10) + (n%10)) ;
reverse(n/10) ;
}
return new;
}4. By AsterisK
Made by AsterisK. ( Source )
enter an integer 1334 the reverse of the number you entered is: 4331
#include <stdio.h>
int main() {
int a,b,cnt=0,n;
printf("enter an integer\n");
scanf("%d",&a);
n=a;
//this part counts how many digits are in the user input
while(a>0){
a = a/10;
++cnt;
}
//now the reverse part should be like this
printf("the reverse of the number you entered is: ");
while(cnt>0){
printf("%d", n%10);
n = n/10;
- cnt;
}
return 0;
}5. By Lakshay kamat
Made by Lakshay kamat. Prints the reversed numbers of a number. ( Source )
05 04 03 02 01 00
#include <stdio.h>
int main(int argc, char const *argv[])
{
//Enter a Number
int c;
scanf("%d",&c);
int i=c;
do
{
printf("%02d\n",i);
i--;
} while (i>=0);
return 0;
}6. By Mukund Kedia
Made by Mukund Kedia. ( Source )
468 864
#include<stdio.h>
void main()
{
int n,a,i;
int s=0;
scanf("%d ",&n);
for(i=1;n!=0;i++)
{
a=n%10;
n=n/10;
printf("%d",a);
}
}7. By Wajeeh
Made by Wajeeh. ( Source )
436 Enter an integer: Reversed Number = 634
#include <stdio.h>
int main()
{
int n, reversedNumber = 0, remainder;
printf("Enter an integer: ");
scanf("%d", &n);
while(n != 0)
{
remainder = n%10;
reversedNumber = reversedNumber*10 + remainder;
n /= 10;
}
printf("Reversed Number = %d", reversedNumber);
return 0;
}8. By Yamin Mansuri
Made by Yamin Mansuri. A basic c program to reverse a number. ( Source )
Entered Number is : 362 Reverse Number is : 263
#include <stdio.h>
int main() {
int num;
int lastdigit ;
int reverse ;
reverse = 0;
scanf("%d",&num);
printf("Entered Number is : %d \n",num);
while (num>0){
lastdigit = num % 10;
reverse = (reverse*10)+lastdigit;
num = num / 10;}
printf("Reverse Number is : %d",reverse);
return 0;
}9. By Umair Ali
Made by Umair Ali. ( Source )
Enter a no: 244 no = 442
#include <stdio.h>
int main()
{
int n,x=0;
printf("Enter a no: ");
scanf("%d",&n);while(n!=0)
{
x=x*10+n%10;
n=n/10;
}
printf("\n no = %d",x);
}10. By Ipang
Made by lpang. Program to Reverse a floating point number (double). ( Source )
Before: 14125.000000 After: 0.521410
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
double fp_reverse( const double n )
{
static char s[ 310 ] = { 0 };
if( !n ) return n;
if( -1 == sprintf( s, "%lf", n ) ) // put <n> into string <s>
{
return 0.0; // sprintf() return -1 on error, exit function
}
for( size_t L = strlen( s ) - 1, H = ( L + 1 ) / 2, i = ( *s == '-' ? 1 : 0 ); i < H; i++ )
{
char cswap = *( s + i ); // swap char from each end to reverse the string <s>
*( s + i ) = *( s + L - i );
*( s + L - i ) = cswap;
}
return strtod( s, NULL ); // return <s> as double
}
int main()
{
while( 1 )
{
double n;
if( 1 != scanf( "%lf", &n ) ) break; // read error, exit loop
printf( "Before: %lf\n", n );
printf( "After: %lf\n\n", fp_reverse( n ) );
}
return 0;
}11. By kyllen
Made by kyllen ( Source )
Input: 255 Result: 552
#include <stdio.h>
/**
* Reverses
* a number.
*/
long
reverse( long n )
{
long ret = 0;
while (n) // > 0
{
/**
* Pushes the digits
* to the left.
*/
ret *= 10;
/**
* Adds the
* last digit.
*/
ret += (n % 10);
/**
* Removes the
* last digit.
*/
n /= 10;
}
return ret;
}
/**
* Main function.
*/
int
main( int argc
, char const * argv[]
)
{
long input = 538279;
long result = 0;
scanf("%ld", &input);
result = reverse(input);
printf("Input: %ld\n", input);
printf("Result: %ld\n", result);
return 0;
}
12. By Skyler
Made by Skyler. Reverse number and check it with old number. ( Source )
Enter any 5 digit number: The entered number is = 1414 The reversed number is = 41410 Entered number and reversed number are not equal
#include <stdio.h>
int main()
{
int num,renum=0,a,n;
printf ("Enter any 5 digit number:\n");
scanf("%d",&num) ;
a=num%10; //5th
n=num/10;
renum=renum+a*10000;
a=n%10;
n=n/10;
renum=renum+a*1000; //4th
a=n%10;
n=n/10;
renum=renum+a*100;//3rd
a=n%10;
n=n/10;
renum=renum+a*10;//2nd
a=n%10;
renum=renum+a;
printf ("\nThe entered number is = %d\nThe reversed number is = %d",num,renum );
if(num==renum)
printf("\nEntered Number and reversed are equal.so its a Palindrome");
else
printf ("\nEntered number and reversed number are not equal");
return 0;
}