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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<string.h>
  4.  
  5. char *strrev(char *str)
  6. {
  7.     char *p1, *p2;
  8.  
  9.     if (! str || ! *str)
  10.         return str;
  11.     for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2)
  12.     {
  13.         char temp = *p1;
  14.         *p1 = *p2;
  15.         *p2 = temp;
  16.     }
  17.     return str;
  18. }
  19.  
  20. int main(void) {
  21.     int numberWantToCheck;
  22.     printf("What's the number you want to check?\n");
  23.     scanf("%d", &numberWantToCheck);
  24. 	int bufferSize = snprintf(NULL, 0, "%d", numberWantToCheck) + 1;
  25.  
  26.     char stringOfTheNum[bufferSize];
  27.     char reversedNum[bufferSize];
  28.     snprintf(stringOfTheNum, bufferSize, "%d", numberWantToCheck); // converte numero para String
  29.     strcpy(reversedNum, stringOfTheNum); // copia a string para reversedNum
  30.     strrev(reversedNum); // inverte reversedNum
  31.  
  32.     if(strcmp(reversedNum, stringOfTheNum) == 0) {
  33.         printf("The number is palindrome.\n");
  34.     } else {
  35.         printf("The number is not palindrome.\n");
  36.     }
  37. }
Success #stdin #stdout 0s 9424KB
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stdout
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What's the number you want to check?
The number is not palindrome.
https://ideone.com/5MCd7n
https://pt.stackoverflow.com/q/352437/100
language:
C (clang 8.0)
created:
6 years ago
visibility:
secret

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