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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. struct student {
  5.   char name[20];
  6.   double height;
  7.   double weight;
  8.   double bmi;
  9. };
  10.  
  11. int main()
  12. {
  13.   char s[100],buf[100];
  14.   int c=0,i,j;
  15.   FILE *fp;
  16.   struct student *data,t;
  17.   double h;
  18.  
  19. /*  printf("file name = ");*/
  20.   scanf("%s",s);
  21.   fp=fopen(s,"r");
  22.   if(!fp) {
  23.     printf("file open error!\n");
  24.     return 1;
  25.   }
  26.  
  27.   while(fgets(buf,100,fp))c++;
  28.   rewind(fp);
  29.  
  30.   data=malloc(c*sizeof(struct student));
  31.   for(i=0; fgets(buf,100,fp); i++) {
  32.     sscanf(buf,"%s %lf %lf",data[i].name,&data[i].height,&data[i].weight);
  33.     h=data[i].height/100;
  34.     data[i].bmi=data[i].weight/h/h;
  35.   }
  36.  
  37.   for(i=0; i<c; i++) {
  38.     for(j=i+1; j<c; j++) {
  39.       if(data[i].bmi<data[j].bmi) {
  40.         t=data[i];
  41.         data[i]=data[j];
  42.         data[j]=t;
  43.       }
  44.     }
  45.   }
  46.  
  47.   for(i=0; i<c; i++) {
  48.     printf("%s BMI=%f",data[i].name,data[i].bmi);
  49.     if(data[i].bmi>25)printf(" himan");
  50.     printf("\n");
  51.   }
  52.  
  53.   return 0;
  54. }
Runtime error #stdin #stdout 0.02s 1812KB
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stdin
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Standard input is empty
stdout
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file open error!
https://ideone.com/ZvUuR
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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