#include <stdio.h>
#include <stdlib.h>
#include <time.h>
 
#define TRIALS 100000  // 試行回数
#define COINS 3        // コインの枚数
 
int main() {
    int histogram[COINS + 1] = {0};  // 表の枚数ごとのカウントを保存する配列
    int heads;
 
    // 乱数の種を設定
    srand((unsigned int)time(NULL));
 
    // 試行を行う
    for (int i = 0; i < TRIALS; i++) {
        heads = 0;  // 表の枚数をリセット
 
        // コインを3回投げる
        for (int j = 0; j < COINS; j++) {
            if (rand() % 2 == 0) {  // 0なら表、1なら裏とする
                heads++;
            }
        }
 
        // 表の枚数をヒストグラムにカウント
        histogram[heads]++;
    }
 
    // 結果の表示
    printf("表の枚数\t試行回数\n");
    for (int i = 0; i <= COINS; i++) {
        printf("%d\t\t%d\n", i, histogram[i]);
    }
 
    return 0;
}
 

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