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  1. #include <stdio.h>
  2.  
  3. #define MAX 100
  4.  
  5. int size = 0;
  6. int seiseki[MAX];
  7.  
  8. void record(int score);
  9. double average(void);
  10.  
  11. int main(void) {
  12.     int num, i, score;
  13.  
  14.     printf("学生の人数を入力：\n");
  15.     scanf("%d", &num);
  16.  
  17.     for (i = 0; i < num; i++) {
  18.         printf("%d人目の点数を入力：\n", i + 1);
  19.         scanf("%d", &score);
  20.         record(score);
  21.     }
  22.  
  23.     printf("平均点：%.2f\n", average());
  24.  
  25.     return 0;
  26. }
  27.  
  28. // 点数を配列に記録し、sizeを更新
  29. void record(int score) {
  30.     if (size < MAX) {
  31.         seiseki[size] = score;
  32.         size++;
  33.     } else {
  34.         printf("エラー：配列がいっぱいです\n");
  35.     }
  36. }
  37.  
  38. // 現在の点数の平均を計算
  39. double average(void) {
  40.     int sum = 0;
  41.     for (int i = 0; i < size; i++) {
  42.         sum += seiseki[i];
  43.     }
  44.     return size > 0 ? (double)sum / size : 0.0;
  45. }
Success #stdin #stdout 0s 5320KB
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stdin
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2 3 4
stdout
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学生の人数を入力：
1人目の点数を入力：
2人目の点数を入力：
平均点：3.50
https://ideone.com/3LV1gZ
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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