float 变量不存储浮动值

Question

struct score
{
  int math;
  int science;
  int english;
  int history;
  int mapeh;
  int tle;
  int filipino;
};

struct info
{
  string firstName;
  string lastName;
  score grades;
  float average;
  int studentnum;
  int rank;
  bool remark;
};

here is my code

the value stored in the subjects is:

 85 87 89 90 94 92 95

respectively,

vector<info> stud;

for( int i=0; i<stud.size(); i++)
{
 stud[i].average=  (stud[i].grades.math
                   +stud[i].grades.science
                   +stud[i].grades.english
                   +stud[i].grades.history
                   +stud[i].grades.mapeh
                   +stud[i].grades.tle
                   +stud[i].grades.filipino)/7;
}

the value stored in stud[i].average should be 90.28 but instead it is only 90.

what have i missed? i have tried using the debugger and it shows me 90 (no decimals)

using setprecision it will only show me 90.00 not 90.28

i have also tried changing the data type for the subjects to float, and it didnt work.

thank you.

Answer 1

Try changing to this:

stud[i].average=  (stud[i].grades.math
                   +stud[i].grades.science
                   +stud[i].grades.english
                   +stud[i].grades.history
                   +stud[i].grades.mapeh
                   +stud[i].grades.tle
                   +stud[i].grades.filipino)/7.0;

(int)/(float) will give you a (float) result.