FAQ: Code Challenge: C++ Functions - Tenth Power

This community-built FAQ covers the “Tenth Power” exercise from the lesson “Code Challenge: C++ Functions”.

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using namespace std;

class Student{
		float Marks[7];
		char Name[40];
		int Number;
	Student(float marks[], int number , char name[]){
		Number = number;
		Name[40] = name[40];
		Marks[7] = marks[7];
		cout << "Hello: " << name << endl;
    float calc_average(){
    	int m;
    	float sum=0, average;
    	for(m=0 ;m<Number; m++){
    		sum += Marks[m];
		average =sum / 7;
		return average;

int main (){
	char name[40];
	float marks[7];
	int i, number;
	char subjects [7][50] = {"Introduction to programming", "Programming Lab", "Discrete Math", "Introduction to Computer Systems", "Elements of Economics", "Communication Skills", "Physics for Computing Sysytems"};
	cout << "Enter your name: ";
	cin >> name;
	for(i=0; i<7; i++){
		cout << "Enter the marks for " << subjects[i] << ": ";
		cin >> marks[i];
	Student Gracio(marks, 7, name);
	cout << "The average for your marks is: " << Gracio.calc_average() << "\n";
	return 0;

Could someone help please…It’s giving me the wrong average…:thinking:

Maybe you can help yourself: since it’s doing a bunch of stuff, how far does it get before things start being wrong? Since it’s a program that you are writing, you could add code in it that prints out everything that is being done.

1 Like

It’s all good until it comes to printing average…The function is actually returning a wrong average.

That’s not a black box either. You can look at what happens in it. It divides some sum by some length, doesn’t it? So is the sum right, is the length right? And if not, continue looking at whichever of them wasn’t right.