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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. // typedefと無名構造体を用いたBodyの定義
  5. typedef struct {
  6.     int id;
  7.     double height;
  8. } Body;
  9.  
  10. // 身長の昇順でソートするための比較関数
  11. int compareHeight(const void *a, const void *b) {
  12.     Body *bodyA = (Body *)a;
  13.     Body *bodyB = (Body *)b;
  14.     if (bodyA->height < bodyB->height) return -1;
  15.     else if (bodyA->height > bodyB->height) return 1;
  16.     else return 0;
  17. }
  18.  
  19. int main() {
  20.     // Body構造体の配列を宣言・初期化
  21.     Body data[] = {
  22.         {101, 172.5},
  23.         {102, 165.3},
  24.         {103, 180.2},
  25.         {104, 158.9},
  26.         {105, 170.0}
  27.     };
  28.  
  29.     int n = sizeof(data) / sizeof(data[0]);
  30.  
  31.     // 身長の昇順にソート
  32.     qsort(data, n, sizeof(Body), compareHeight);
  33.  
  34.     // 結果を表示
  35.     printf("ID\tHeight\n");
  36.     for (int i = 0; i < n; i++) {
  37.         printf("%d\t%.1f\n", data[i].id, data[i].height);
  38.     }
  39.  
  40.     return 0;
  41. }
Success #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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ID	Height
104	158.9
102	165.3
105	170.0
101	172.5
103	180.2
https://ideone.com/VoiebF
language:
C99 (gcc 8.3)
created:
1 day ago
visibility:
public

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