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#include <iostream>
using namespace std;
const int SIZE=50,NUMTEST=4;
double findexamavg(int grades[][NUMTEST], int classsize);
void findhighscore(int grades[][NUMTEST], int classsize);
void findstudavg(int grades[][NUMTEST], int classsize);
void countermarks(int grades[][NUMTEST], int classsize);
int main()
{
int grades[SIZE][NUMTEST],classsize,stnum,test;
double exavg[NUMTEST],classavg,sum=0;
cout<<"How many students in class?"<<endl;
cin>>classsize;
//Read in data
cout<<"Please enter studnts' grades"<<endl;
for(stnum=0;stnum<classsize;stnum++)
{
for(test=0;test=NUMTEST;test++)
cin>>grades[stnum][test];
}
//Printing test average
for(test=0;test<NUMTEST;test++)
cout<<"test number "<<test<<"had an average of "<<findexamavg(grades,classsize)<<endl;
//Printing Students' individiual average
findstudavg(grades,classsize);
for(test=0; test<NUMTEST;test++)
{
exavg[test]=findexamavg(grades,classsize);
sum+=exavg[test];
}
classavg=(double)sum/NUMTEST;
cout<<"Overall class average is "<<classavg<<endl;
return 0;
}
// Find and print each exam's average and return to calling function
double findexamavg(int grades[][NUMTEST], int classsize)
{
int sum=0,stnum,test;
double exavg;
for(test=0;test<NUMTEST;test++)
{
sum=0;
for(stnum=0;stnum<classsize;stnum++)
sum+=grades[stnum][test];
exavg=(double)sum/classsize;
}
return exavg;
}
// Find and print each studet's average
void findstudavg(int grades[][NUMTEST], int classsize)
{
int sum=0,stnum,test;
double stavg;
for(stnum=0;stnum<classsize;stnum++)
{
sum=0;
for(test=0;test<NUMTEST;test++)
sum+=grades[stnum][test];
stavg=(double)sum/NUMTEST;
cout<<"student number "<<stnum<<"had an average of "<<stavg<<endl;
}
return ;
}
//Find and print highest score for each exam
void findhighscore(int grades[][NUMTEST], int classsize)
{
int stnum,test;
for(test=0;test<NUMTEST;test++)
{
int highscore=grades[0][test];
for(stnum=0;stnum<classsize;stnum++)
{
if(highscore<grades[stnum][test])
highscore=grades[stnum][test];
}
cout<<"Highest score for test number "<<test<<" is "<<highscore<<endl;
}
return;
}
//Find and print how many grades above,below and equal to average for each exam
void countermarks(int grades[][NUMTEST], int classsize,int &numless,int &numgr,int &numeq)
{
int stnum,test;
double exavg;
for(test=0;test<NUMTEST;test++)
{
numgr=0;
numless=0;
numeq=0;
exavg=findexamavg(grades,classsize);
for(stnum=0;stnum<classsize;stnum++)
if(grades[stnum][NUMTEST]<exavg)
numless++;
else if(grades[stnum][NUMTEST]>exavg)
numgr++;
else
numeq++;
cout<<"the number of grades greater than average in exam "<<test<<" is "<<numgr;
cout<<" less than average is "<<numless<<" and number of grades which are equal to the average is "<<numeq<<endl;
}
return;
}
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