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  1. #include<stdio.h>
  2. #include<math.h>
  3. #define STUDENTS 5
  4. #define EXAMS 3
  5.  
  6. typedef struct{
  7.     int id;
  8.     int math;
  9.     int english;
  10.     int physics;
  11.     double ave;
  12.     double std;
  13. }Grades;
  14.  
  15. int main(void){
  16.     Grades data[]={
  17.         {1,65,80,95},
  18.         {2,70,68,75},
  19.         {3,60,100,83},
  20.         {4,100,55,74},
  21.         {5,90,85,100}};
  22.  
  23.     for (int i=0; i<STUDENTS; i++){
  24.         data[i].ave=(data[i].math + data[i].english + data[i].physics) / EXAMS;
  25.         data[i].std=sqrt(((data[i].math - data[i].ave)*(data[i].math - data[i].ave))+((data[i].english - data[i].ave)*(data[i].english - data[i].ave))+((data[i].physics - data[i].ave)*(data[i].physics - data[i].ave)))/ EXAMS;
  26.         printf("id %d : ave %lf : std %lf\n",data[i].id,data[i].ave,data[i].std);
  27.     }
  28. return 0;
  29. }
Success #stdin #stdout 0s 5280KB
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stdin
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Standard input is empty
stdout
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id 1 : ave 80.000000 : std 7.071068
id 2 : ave 71.000000 : std 1.699673
id 3 : ave 81.000000 : std 9.463380
id 4 : ave 76.000000 : std 10.651030
id 5 : ave 91.000000 : std 3.620927
https://ideone.com/U65ARL
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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