tGRcaK - Online C Compiler & Debugging Tool

#include <stdio.h>

int main() {
    // 画素値データ（260個）
    int data[] = {
        21,10,40,76,48,30,10,11,27,23,21,27,32,8,0,2,6,4,17,25,
        17,11,74,59,32,50,17,15,23,17,13,55,55,48,23,0,2,2,8,6,
        13,8,11,13,15,21,15,21,21,6,13,86,86,76,82,44,4,4,6,4,
        11,6,2,10,10,10,19,19,2,11,78,78,84,74,74,69,69,6,4,4,
        2,6,4,10,11,11,17,11,10,86,86,80,80,65,67,69,82,6,2,4,
        2,8,4,11,13,15,21,8,86,84,78,82,78,76,69,82,21,2,0,2,
        13,17,15,13,6,6,13,15,89,91,86,84,88,88,82,65,21,19,25,25,
        19,27,32,29,21,21,57,44,89,91,86,88,91,84,88,19,15,11,6,0,
        27,29,32,32,29,13,10,25,55,88,88,88,91,91,88,48,10,8,0,0,
        19,27,30,30,19,21,30,21,25,70,55,74,89,53,17,21,13,38,8,0,
        21,30,34,34,25,19,17,8,6,6,10,8,6,4,10,11,10,23,4,0,
        21,29,32,38,36,19,8,13,13,19,13,13,6,4,10,10,8,2,2,2,
        15,27,30,32,23,8,8,13,25,29,19,17,13,8,15,15,11,6,4,4
    };

    int histogram[10] = {0};
    int length = sizeof(data) / sizeof(data[0]);

    // ヒストグラムの集計処理
    for (int i = 0; i < length; i++) {
        int index = data[i] / 10;
        if (index > 9) index = 9; // 保険：最大値99までとする
        histogram[index]++;
    }

    // 結果の出力
    for (int i = 0; i < 10; i++) {
        printf("h(%d0-%d9): %d\n", i, i, histogram[i]);
    }

    return 0;
}