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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int main(void)
  5. {
  6.     typedef struct {
  7.         int id;     
  8.         int score;  
  9.         double ave; 
  10.         double std;
  11.     } Grades;
  12.  
  13.     Grades data[] = {
  14.         {1, 70, 0.0, 0.0},
  15.         {2, 65, 0.0, 0.0},
  16.         {3, 80, 0.0, 0.0},
  17.         {4, 75, 0.0, 0.0},
  18.         {5, 60, 0.0, 0.0}
  19.     };
  20.  
  21.     int n = sizeof(data) / sizeof(data[0]);
  22.     double sum = 0.0;
  23.     double var = 0.0;
  24.     int i;
  25.  
  26.     for (i = 0; i < n; i++) {
  27.         sum += data[i].score;
  28.     }
  29.     data[0].ave = sum / n;
  30.  
  31.     for (i = 0; i < n; i++) {
  32.         var += pow(data[i].score - data[0].ave, 2);
  33. 	    data[0].std = sqrt(var / (n - 1));
  34.  
  35.     	printf("id:%d\n",data[i].id);
  36.     	printf("標本平均：%.1f\n", data[0].ave);
  37.     	printf("標本標準偏差：%.1f\n", data[0].std);
  38. 	}
  39.  
  40.     return 0;
  41. }
Success #stdin #stdout 0s 5288KB
comments (?)
stdin 
Standard input is empty
stdout 
id:1
標本平均：70.0
標本標準偏差：0.0
id:2
標本平均：70.0
標本標準偏差：2.5
id:3
標本平均：70.0
標本標準偏差：5.6
id:4
標本平均：70.0
標本標準偏差：6.1
id:5
標本平均：70.0
標本標準偏差：7.9
https://ideone.com/Pe8uA6
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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