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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. typedef struct {
  5.     int id;
  6.     double height;
  7.     double weight;
  8. } Body;
  9.  
  10. int main(void) {
  11.     Body data[5] = {
  12.         {1, 165, 60},
  13.         {2, 170, 68},
  14.         {3, 160, 50},
  15.         {4, 180, 75},
  16.         {5, 175, 80}
  17.     };
  18.  
  19.     // --- 身長の昇順に並び替え（単純バブルソート） ---
  20.     for (int i = 0; i < 5 - 1; i++) {
  21.         for (int j = i + 1; j < 5; j++) {
  22.             if (data[i].height > data[j].height) {
  23.                 Body tmp = data[i];
  24.                 data[i] = data[j];
  25.                 data[j] = tmp;
  26.             }
  27.         }
  28.     }
  29.  
  30.     // --- 並び替え後の結果を表示 ---
  31.     printf("id  height  weight\n");
  32.     for (int i = 0; i < 5; i++) {
  33.         printf("%d   %.0f     %.0f\n", data[i].id, data[i].height, data[i].weight);
  34.     }
  35.  
  36.     // --- 下から3人の平均と標準偏差 ---
  37.     double sum = 0.0;
  38.     for (int i = 2; i < 5; i++) sum += data[i].height;
  39.     double ave = sum / 3.0;
  40.  
  41.     double var = 0.0;
  42.     for (int i = 2; i < 5; i++) var += pow(data[i].height - ave, 2);
  43.     double std = sqrt(var / 3.0);
  44.  
  45.     printf("\nAverage height (top 3): %.1f cm\n", ave);
  46.     printf("Standard deviation: %.1f cm\n", std);
  47.  
  48.     return 0;
  49. }
  50.  
Success #stdin #stdout 0s 5296KB
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stdin
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stdout
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id  height  weight
3   160     50
1   165     60
2   170     68
5   175     80
4   180     75

Average height (top 3): 175.0 cm
Standard deviation: 4.1 cm
https://ideone.com/9AlQPN
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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