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  1. #include <stdio.h>
  2.  
  3. typedef struct {
  4.     int id;
  5.     int english;
  6.     char class;
  7. } Student;
  8.  
  9.  
  10. void classify(Student *data) {
  11.     if (data->english >= 90) data->class = 'A';      
  12.     else if (data->english >= 80) data->class = 'B'; 
  13.     else if (data->english >= 70) data->class = 'C'; 
  14.     else if (data->english >= 60) data->class = 'D'; 
  15.     else data->class = 'F'; // 60未満
  16. }
  17.  
  18. int main() {
  19.  
  20.     Student students[5] = {
  21.         {1, 60}, {2, 80}, {3, 90}, {4, 70}, {5, 50}
  22.     };
  23.  
  24.     printf("ID\tEnglish\tClass\n");
  25.     for (int i = 0; i < 5; i++) {
  26.         classify(&students[i]);
  27.         printf("%d\t%d\t%c\n", students[i].id, students[i].english, students[i].class);
  28.     }
  29.     return 0;
  30. }
Success #stdin #stdout 0.01s 5284KB
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stdin
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Standard input is empty
stdout
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ID	English	Class
1	60	D
2	80	B
3	90	A
4	70	C
5	50	F
https://ideone.com/64RrsC
language:
C99 (gcc 8.3)
created:
1 day ago
visibility:
public

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