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  1. #include <stdio.h>
  2.  
  3. int isdigit(char c) {
  4.     return c >= '0' && c <= '9';
  5. }
  6.  
  7. int todigit(char c) {
  8.     return c - '0';
  9. }
  10.  
  11. int main() {
  12.     char input[256];
  13.     int i = 0, sign = 1, result = 0;
  14.  
  15.     scanf("%s", input);
  16.  
  17.     if (input[0] == '-') {
  18.         sign = -1;
  19.         i = 1;
  20.     } else if (input[0] == '+') {
  21.         sign = 1;
  22.         i = 1;
  23.     }
  24.  
  25.     while (input[i] != '\0' && isdigit(input[i])) {
  26.         result = result * 10 + todigit(input[i]);
  27.         i++;
  28.     }
  29.  
  30.     result *= sign;
  31.  
  32.     printf("value: %d\n", result);
  33.     printf("mod 25: %d\n", result % 25);
  34.  
  35.     return 0;
  36. }
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin
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-1234
stdout
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value: -1234
mod 25: -9
https://ideone.com/oBMC5B
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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