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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int n;
  5.     printf("Enter the number: ");
  6.     scanf("%d",&n);
  7.     int r=0;
  8.     int lastdigit=0;
  9.     while(n!=0){
  10.            lastdigit= n%10;
  11.            r=r*10;
  12.            r= r + lastdigit;
  13.            n=n/10;
  14.      }
  15.           int sum;
  16.           sum=n+r;
  17.           printf("The sum is %d",sum);
  18.  
  19.  
  20. 	return 0;
  21. }
  22.  
Success #stdin #stdout 0.01s 5288KB
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stdin
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stdout
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Enter the number: The sum is 21
https://ideone.com/4uwSM7
language:
C (gcc 8.3)
created:
4 hours ago
visibility:
public

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