#include <stdio.h>
#include <stdlib.h>  // abs関数を使うため
 
int main() {
    int num;
    int digits = 0;
 
    printf("整数を入力してください: ");
    scanf("%d", &num);
 
    // 0の桁数は1桁とする
    if (num == 0) {
        digits = 1;
    } else {
        num = abs(num);  // 負の数も正しく扱う
        while (num > 0) {
            num /= 10;
            digits++;
        }
    }
 
    printf("桁数: %d\n", digits);
 
    return 0;
}

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