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  1. #include <stdio.h>
  2.  
  3. int isdigit(char c) {
  4.     return ('0' <= c && c <= '9');
  5. }
  6.  
  7. int todigit(char c) {
  8.     return c - '0';
  9. }
  10.  
  11. int main() {
  12.     char str[100];
  13.     int i = 0, sign = 1, result = 0;
  14.  
  15.     printf("文字列を入力: ");
  16.     scanf("%s", str);
  17.  
  18.     if (str[0] == '-') {
  19.         sign = -1;
  20.         i++;
  21.     } else if (str[0] == '+') {
  22.         i++;
  23.     }
  24.  
  25.     while (str[i] != '\0' && isdigit(str[i])) {
  26.         result = result * 10 + todigit(str[i]);
  27.         i++;
  28.     }
  29.  
  30.     result *= sign;
  31.  
  32.     printf("変換された数値: %d\n", result);
  33.     printf("25で割った余り: %d\n", result % 25);
  34.  
  35.     return 0;
  36. }
Success #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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文字列を入力: 変換された数値: 0
25で割った余り: 0
https://ideone.com/bfm17x
language:
C (gcc 8.3)
created:
8 hours ago
visibility:
public

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