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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. #define STUDENTS 5
  5. #define EXAMS 3
  6.  
  7. typedef struct{
  8.     int id;
  9.     int math;
  10.     int english;
  11.     int physics;
  12.     double ave;
  13.     double std;
  14. } Grades;
  15.  
  16. int main(void)
  17. {
  18.     Grades data[] = {
  19.         { 1, 65, 80, 95 },
  20.         { 2, 70, 68, 75 },
  21.         { 3, 60, 100, 83 },
  22.         { 4, 100, 55, 74 },
  23.         { 5, 90, 85, 100 }
  24.     };
  25.  
  26.     for(int i = 0; i < STUDENTS; i++){
  27.         data[i].ave =
  28.             (data[i].math + data[i].english + data[i].physics) / EXAMS;
  29.  
  30.         data[i].std = sqrt(
  31.             (
  32.                 (data[i].math    - data[i].ave) * (data[i].math    - data[i].ave) +
  33.                 (data[i].english - data[i].ave) * (data[i].english - data[i].ave) +
  34.                 (data[i].physics - data[i].ave) * (data[i].physics - data[i].ave)
  35.             ) / EXAMS
  36.         );
  37.         printf("id %d : %.1f, %.1f\n",data[i].id, data[i].ave, data[i].std);
  38.     }
  39.  
  40.     return 0;
  41. }
Success #stdin #stdout 0.01s 5320KB
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stdin
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Standard input is empty
stdout
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id 1 : 80.0, 12.2
id 2 : 71.0, 2.9
id 3 : 81.0, 16.4
id 4 : 76.0, 18.4
id 5 : 91.0, 6.3
https://ideone.com/xfj4bQ
language:
C (gcc 8.3)
created:
14 hours ago
visibility:
public

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