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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <math.h>
  4. typedef struct {
  5.     int id;
  6.     int height; 
  7.     int weight; 
  8. } Body;
  9. int cmp_height_asc(const void *a, const void *b) {
  10.     const Body *A = a;
  11.     const Body *B = b;
  12.     return (A->height - B->height);
  13. }
  14. int main(void) {
  15.     Body data[] = {
  16.         {1, 165, 60},
  17.         {2, 170, 68},
  18.         {3, 160, 50},
  19.         {4, 180, 75},
  20.         {5, 175, 80}
  21.     };
  22.     const size_t n = sizeof(data) / sizeof(data[0]);
  23.     qsort(data, n, sizeof(Body), cmp_height_asc);
  24.     printf("id\theight[cm]\tweight[kg]\n");
  25.     for (size_t i = 0; i < n; ++i) {
  26.         printf("%d\t%d\t\t%d\n", data[i].id, data[i].height, data[i].weight);
  27.     }
  28.     const int k = 3;
  29.     if (n < (size_t)k) {
  30.         fprintf(stderr, "データ数が足りません。\n");
  31.         return 1;
  32.     }
  33.     double sum = 0.0;
  34.     for (size_t i = n - k; i < n; ++i) {
  35.         sum += data[i].height;
  36.     }
  37.     double ave = sum / k;
  38.     double sqsum = 0.0;
  39.     for (size_t i = n - k; i < n; ++i) {
  40.         double diff = data[i].height - ave;
  41.         sqsum += diff * diff;
  42.     }
  43.     double variance = sqsum / k; 
  44.     double std = sqrt(variance);
  45.  
  46.     printf("\n上位 %d 名の身長の平均 ave = %.1f cm\n", k, ave);
  47.     printf("上位 %d 名の身長の標準偏差 std = %.1f cm\n", k, std);
  48.  
  49.     return 0;
  50. }
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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id	height[cm]	weight[kg]
3	160		50
1	165		60
2	170		68
5	175		80
4	180		75

上位 3 名の身長の平均 ave = 175.0 cm
上位 3 名の身長の標準偏差 std = 4.1 cm
https://ideone.com/Qq7mYg
language:
C99 (gcc 8.3)
created:
1 day ago
visibility:
public

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