#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
 
int main(void) {
 
    char hako[256] = "";   // 出力した文字をためていくバッファ
    int running = 1;       // ループ継続フラグ
 
    srand((unsigned int)time(NULL));  // 乱数の初期化
 
    while (running) {
 
        // 0 または 1 を生成
        int x = rand() % 2;
 
        // あ or た を選ぶ（UTF-8 で 3バイト文字）
        const char *ch = (x == 0) ? "あ" : "た";
 
        // 出力
        printf("%s", ch);
 
        // hako に追記（strcat は安全でないが教育用途として採用）
        strcat(hako, ch);
 
        // 末尾が "あたたたた" か確認（strncmp で比較）
        // UTF-8 は可変長なので「最後の 5 文字」を正しく検出するには
        // "あたたたた" をそのまま含むかを strstr で確認する方が簡易。
        if (strstr(hako, "あたたたた") != NULL) {
            printf("\nお前はもう死んでいる\n");
            running = 0;
        }
    }
 
    return 0;
}
 

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