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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. // 無名構造体＋typedefでBody型を定義
  5. typedef struct {
  6.     int id;
  7.     double height;
  8.     double weight;
  9. } Body;
  10.  
  11. int main(void) {
  12.     // 構造体配列dataの初期化
  13.     Body data[] = {
  14.         {1, 165, 60},
  15.         {2, 170, 68},
  16.         {3, 160, 50},
  17.         {4, 180, 75},
  18.         {5, 175, 80}
  19.     };
  20.     int n = sizeof(data) / sizeof(data[0]);
  21.  
  22.     // 身長の昇順にソート（単純なバブルソート）
  23.     for (int i = 0; i < n - 1; i++) {
  24.         for (int j = 0; j < n - i - 1; j++) {
  25.             if (data[j].height > data[j + 1].height) {
  26.                 Body temp = data[j];
  27.                 data[j] = data[j + 1];
  28.                 data[j + 1] = temp;
  29.             }
  30.         }
  31.     }
  32.  
  33.     // ソート後の結果表示
  34.     printf("身長の低い順:\n");
  35.     for (int i = 0; i < n; i++) {
  36.         printf("ID:%d  Height:%.0f  Weight:%.0f\n", data[i].id, data[i].height, data[i].weight);
  37.     }
  38.  
  39.     // 上位3名の身長の平均と標準偏差を計算
  40.     double ave = 0.0, std = 0.0;
  41.     for (int i = n - 3; i < n; i++) {
  42.         ave += data[i].height;
  43.     }
  44.     ave /= 3.0;
  45.  
  46.     for (int i = n - 3; i < n; i++) {
  47.         std += pow(data[i].height - ave, 2);
  48.     }
  49.     std = sqrt(std / 3.0);
  50.  
  51.     printf("\n上位3名の平均身長: %.1f cm\n", ave);
  52.     printf("上位3名の身長の標準偏差: %.1f cm\n", std);
  53.  
  54.     return 0;
  55. }
  56.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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身長の低い順:
ID:3  Height:160  Weight:50
ID:1  Height:165  Weight:60
ID:2  Height:170  Weight:68
ID:5  Height:175  Weight:80
ID:4  Height:180  Weight:75

上位3名の平均身長: 175.0 cm
上位3名の身長の標準偏差: 4.1 cm
https://ideone.com/bqLvhZ
language:
C99 (gcc 8.3)
created:
4 days ago
visibility:
public

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