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  1. #include <stdio.h>
  2. #include <math.h>   
  3. typedef struct {
  4.     int id;
  5.     double height;
  6.     double weight;
  7. }list;
  8.  
  9. int main(void) {
  10.     list data[] = {
  11.         {1, 165, 60},
  12.         {2, 170, 68},
  13.         {3, 160, 50},
  14.         {4, 180, 75},
  15.         {5, 175, 80}
  16.     };
  17.     int n = 5;
  18.  
  19.     for (int i = 0; i < n - 1; i++) {
  20.         for (int j = i + 1; j < n; j++) {
  21.             if (data[i].height > data[j].height) {
  22.                 list tmp = data[i];
  23.                 data[i] = data[j];
  24.                 data[j] = tmp;
  25.             }
  26.         }
  27.     }
  28.  
  29.     printf("整列後のデータ（身長昇順）:\n");
  30.     for (int i = 0; i < n; i++) {
  31.         printf("id:%d  height:%lf  weight:%lf\n", data[i].id, data[i].height, data[i].weight);
  32.     }
  33.  
  34.     double sum = 0.0;
  35.     for (int i = n - 3; i < n; i++) {
  36.         sum += data[i].height;
  37.     }
  38.     double ave = sum / 3.0;
  39.  
  40.     double var = 0.0;
  41.     for(int i = n - 3; i < n; i++) {
  42.         var += pow(data[i].height - ave, 2);
  43.     }
  44.     double std = sqrt(var / 3.0); 
  45.  
  46.     printf("\n上位3名の身長平均値 ave = %lf cm\n", ave);
  47.     printf("上位3名の身長標準偏差 std = %lf cm\n", std);
  48.  
  49.     return 0;
  50. }
  51.  
Success #stdin #stdout 0.01s 5320KB
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stdin
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stdout
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整列後のデータ（身長昇順）:
id:3  height:160.000000  weight:50.000000
id:1  height:165.000000  weight:60.000000
id:2  height:170.000000  weight:68.000000
id:5  height:175.000000  weight:80.000000
id:4  height:180.000000  weight:75.000000

上位3名の身長平均値 ave = 175.000000 cm
上位3名の身長標準偏差 std = 4.082483 cm
https://ideone.com/wq6jpy
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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