sMayrD - Online C Compiler & Debugging Tool

#include <stdio.h>

int main(void) {
    int year, diff;

    printf("1900年以降の西暦を入力してください: ");
    scanf("%d", &year);

    if (year < 1900) {
        printf("1900年以降の数値を入力してください。\n");
        return 1;
    }

    diff = (year - 1900) % 12;

    printf("西暦%d年は「", year);

    switch (diff) {
        case 0:  printf("子"); break;
        case 1:  printf("丑"); break;
        case 2:  printf("寅"); break;
        case 3:  printf("卯"); break;
        case 4:  printf("辰"); break;
        case 5:  printf("巳"); break;
        case 6:  printf("午"); break;
        case 7:  printf("未"); break;
        case 8:  printf("申"); break;
        case 9:  printf("酉"); break;
        case 10: printf("戌"); break;
        case 11: printf("亥"); break;
    }

    printf("」年です。\n");

    return 0;
}