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  1. #include <stdio.h>
  2. #include <math.h> 
  3.  
  4. typedef struct {
  5.     int id;
  6.     int math;
  7.     int english;
  8.     int physics;
  9.     double ave; 
  10.     double std; 
  11. } Grades;
  12.  
  13. int main() {
  14.     Grades data[5] = {
  15.         {1, 65, 80, 95, 0.0, 0.0},
  16.         {2, 70, 68, 75, 0.0, 0.0},
  17.         {3, 60, 100, 83, 0.0, 0.0},
  18.         {4, 100, 55, 74, 0.0, 0.0},
  19.         {5, 90, 85, 100, 0.0, 0.0}
  20.     };
  21.  
  22.  
  23.  
  24.     for (int i = 0; i < 5; i++) {
  25.  
  26.         data[i].ave = (data[i].math + data[i].english + data[i].physics) / 3.0;
  27.  
  28.  
  29.         double var = (pow(data[i].math - data[i].ave, 2) +
  30.                       pow(data[i].english - data[i].ave, 2) +
  31.                       pow(data[i].physics - data[i].ave, 2)) / 3.0;
  32.         data[i].std = sqrt(var);
  33.  
  34.  
  35.         printf("%d    %3d     %3d      %3d    %.1f    %.1f\n",
  36.                data[i].id, data[i].math, data[i].english, data[i].physics,
  37.                data[i].ave, data[i].std);
  38.     }
  39.  
  40.     return 0;
  41. }
Success #stdin #stdout 0.01s 5324KB
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stdin
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Standard input is empty
stdout
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1     65      80       95    80.0    12.2
2     70      68       75    71.0    2.9
3     60     100       83    81.0    16.4
4    100      55       74    76.3    18.4
5     90      85      100    91.7    6.2
https://ideone.com/LHkwvv
language:
C99 (gcc 8.3)
created:
13 hours ago
visibility:
public

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