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#include<iostream.h>
#include <stdlib.h>
#include<iomanip.h>
int main(void)
{   char s1;
    int i,s[100][4],n,j,s2,s3,s4;
    float a[100];char ch[100];
 
     {   
		cout<<"班級人數?";
        cin>>n;
        }
 
    for (i=0;i<n;i++)
		{   
		cout<<"輸入三成績\n";
        cin>>s[i][0]>>s[i][1]>>s[i][2];
        }
 
    for  (i=0;i<n;i++)
    {
      s[i][3]=s[i][0]+s[i][1]+s[i][2];
      a[i]=s[i][3]/3.0;
 
      if (a[i]>=60)
         ch[i]='P';
      else
         ch[i]='F';
     }
     cout<<"  國文 英文 數學 加總   平均       "<<endl<<"==============================\n";
 
     for  (i=0;i<n;i++)
          cout<<setw(5)<<s[i][0]<<setw(5)<<s[i][1]<<setw(5)<<s[i][2]<<setw(5)<<s[i][3]
              <<setw(8)<<setprecision(2)<<a[i]<<"    "<<ch[i]<<endl<<endl;
 
    cout<<"==========================================\n";
 
 
	//quest2
    s2=0,s3=0,s4=0;
    for (i=0;i<n;i++)
    {
	s2=s2+s[i][0];s3=s3+s[i][1];s4=s4+s[i][2];
    }
	 cout <<"tal"<<setw(2)<<s2<<setw(5)<<s3<<setw(5)<<s4<<endl;
	 s2=s2/n;s3=s3/n;s4=s4/n ;
	 cout <<"avg"<<setw(2)<<s2<<setw(5)<<s3<<setw(5)<<s4<<endl;     
	 cin>>s1;
 
	return 0;
	 }

prog.cpp:2:21: error: iostream.h: No such file or directory
prog.cpp:4:20: error: iomanip.h: No such file or directory
prog.cpp: In function ‘int main()’:
prog.cpp:11: error: ‘cout’ was not declared in this scope
prog.cpp:12: error: ‘cin’ was not declared in this scope
prog.cpp:17: error: ‘cout’ was not declared in this scope
prog.cpp:18: error: ‘cin’ was not declared in this scope
prog.cpp:31: error: ‘cout’ was not declared in this scope
prog.cpp:31: error: ‘endl’ was not declared in this scope
prog.cpp:34: error: ‘setw’ was not declared in this scope
prog.cpp:35: error: ‘setprecision’ was not declared in this scope
prog.cpp:46: error: ‘setw’ was not declared in this scope
prog.cpp:49: error: ‘cin’ was not declared in this scope
prog.cpp:7: warning: unused variable ‘j’

Standard output is empty