So, there is my coding, but i use, loop, and if else, BUT the one suppose is Function...

Code:
#include<iostream.h>
#include<string.h>
int main()
{
	char lect_name[30],subject[30];
	char grade,status;
	int mark;
	int numbof_student;
	float sum=0;
	float average;
	
	cout<<"Enter Your Lecturer name : ";
	cin>>lect_name;
	
	cout<<"Enter Your Subject code : ";
	cin>>subject;
	
	cout<<"Enter Number Of Student : ";
	cin>>numbof_student;
	
	for(int s=0; s<numbof_student; s++)
	{
		cout<<s+1<<" student enter grade:";
		cin>>grade;
		
		if(grade=='A')
		{
		mark=4;
		}
		
		else if(grade=='B')
		{
		mark=3;
		}
		
		else if(grade=='C')
		{
		mark=2;
		}
		
		else if(grade=='D')
		{
		mark=1;
		}
		
		else 
		{
			cout<<"Wrong Input"<<endl;
		}
		sum=sum+mark;

	average=sum/numbof_student;
	
	if ((average>=3.5) &&(average<=4.0))
	{
	cout<<"Excellence";
	}

	else if ((average<=3.0) &&(average<=3.5))
	{
	cout<<"Good";
	}

	else if ((average<=2.0) &&(average<=3.0))
	{
	cout<<"Average";
	}

	else if (average<=2.0)
	{
	cout<<"Poor";
	}
	}

	cout<<"\n\n\t\tUniversiti Pendidikan Sultan Idris";
	cout<<"\n\n\t\tTeaching & Learning Evaluation Report";
	cout<<"\n\nName : "<<lect_name<<endl;
	cout<<"Subject Code : "<<subject<<endl;
	cout<<"Average :"<<average<<endl;
	cout<<"Status : "<<status<<endl;
}
i did coding for function, but blablabla... still error and error and then hard i try the simplest coding...

can sumone?