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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.     int n = 5;
  20.  
  21.     // 身長の低い順にソート（単純交換法）
  22.     for (int i = 0; i < n - 1; i++) {
  23.         for (int j = i + 1; j < n; j++) {
  24.             if (data[i].height > data[j].height) {
  25.                 Body temp = data[i];
  26.                 data[i] = data[j];
  27.                 data[j] = temp;
  28.             }
  29.         }
  30.     }
  31.  
  32.     // 並べ替え後の表示
  33.     printf("身長の低い順に並べ替えたデータ：\n");
  34.     for (int i = 0; i < n; i++) {
  35.         printf("id:%d height:%.0f weight:%.0f\n", data[i].id, data[i].height, data[i].weight);
  36.     }
  37.  
  38.     // 下から3名（身長が高い3人）
  39.     double sum = 0.0;
  40.     for (int i = n - 3; i < n; i++) {
  41.         sum += data[i].height;
  42.     }
  43.     double ave = sum / 3.0;
  44.  
  45.     double var = 0.0;
  46.     for (int i = n - 3; i < n; i++) {
  47.         var += pow(data[i].height - ave, 2);
  48.     }
  49.     double std = sqrt(var / 3.0);
  50.  
  51.     printf("\n下から3名（身長が高い3名）の平均身長：%.1f cm\n", ave);
  52.     printf("標準偏差：%.1f cm\n", std);
  53.  
  54.     return 0;
  55. }
  56.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
身長の低い順に並べ替えたデータ：
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

下から3名（身長が高い3名）の平均身長：175.0 cm
標準偏差：4.1 cm
https://ideone.com/GpqtTq
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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