#include <stdio.h>
#include <stdlib.h>
#include <time.h>
 
#define NUM_TRIALS 100000 // 試行回数
#define NUM_COINS 3       // コインの枚数
 
int main() {
    int histogram[NUM_COINS + 1] = {0}; // 表が出た枚数をカウントする配列
    int i, j, heads;
 
    // 乱数シードの初期化
    srand(time(NULL));
 
    // 試行を繰り返す
    for (i = 0; i < NUM_TRIALS; i++) {
        heads = 0; // 表のカウントを初期化
 
        // 3枚のコインを投げる
        for (j = 0; j < NUM_COINS; j++) {
            if (rand() % 2 == 0) { // 0: 表, 1: 裏
                heads++;
            }
        }
 
        // 表の枚数をヒストグラムに記録
        histogram[heads]++;
    }
 
    // 結果を出力
    printf("表の枚数\t出現回数\n");
    for (i = 0; i <= NUM_COINS; i++) {
        printf("%d\t\t%d\n", i, histogram[i]);
    }
 
    return 0;
}
 

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