#include <stdio.h>
 
#define SIZE 1000
 
// (a) 文字が数字かどうか判定
int isdigit(char c) {
    return c >= '0' && c <= '9';
}
 
// (b) 数字文字を数値に変換
int todigit(char c) {
    return c - '0';
}
 
// (c)(d) 文字列を整数に変換
int str_to_int(const char *str) {
    int i = 0;
    int sign = 1;
    int result = 0;
 
    // (d) 先頭が '+' または '-' の場合の処理
    if (str[i] == '-') {
        sign = -1;
        i++;
    } else if (str[i] == '+') {
        i++;  // sign は 1 のまま
    }
 
    // (c) 数字部分の処理
    while (str[i] != '\0' && isdigit(str[i])) {
        result = result * 10 + todigit(str[i]);
        i++;
    }
 
    return sign * result;
}
 
int main() {
    char input[SIZE];
    int num;
 
    printf("整数を文字列で入力してください: ");
    scanf("%s", input);  // (e) 文字列として読み込む
 
    num = str_to_int(input);
 
    printf("変換された数値: %d\n", num);
    printf("25で割った余り: %d\n", num % 25);
 
    return 0;
}

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

MTIzNA==

1234