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INCORPORATE IF ELSE IF STATEMENT INTO WHILE

fresh716 (8)
I need to incorporate an if else that only add points if they are good else make
them enter again. Can someone please help me with this?

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//This program will calculate and display student letter grade
#include <iostream>
#include <iomanip> //needed for manipulating output
#include <cmath>
#include <cstdlib>//needed to clear screen
#include <string>

using namespace std;


int main()
{

[code]
//Declare and initialize variables
double avg = 0;
double grade = 0;
double finalGrade = 0;
double points = 0;
double totalPoints = 0;
int numOfTest= 0;
char letterGrade;
char out1 = 'y';
char in1 = 'Y';
string fname, lname;

cout<<"Would you like to use this grading program ? <Y> or <y>"<<endl;
cout<<"OR enter <N> or <n> to exit"<<endl;
cin>>out1;
while(out1== 'Y'|| out1 =='y')//allows user to enter or exit program

{

system("cls");//clears screen
cout <<"Please enter your first name: " <<endl;
cin >>fname;//user enters name
cout <<"\nPlease enter your last name: " <<endl;
cin >>lname;
system("cls");
while(in1== 'Y' || in1== 'y')
{

cout << fname<<","<<endl;
cout<<"\nPlease enter the grade point value of the assignment:" <<endl;

cin >>points;
totalPoints = totalPoints+points;//Adds point total
numOfTest++;//adds number of grades entered
cout <<"\nPlease enter your score:"<<endl;
cin >> grade;

finalGrade = finalGrade + grade;//adds grade totals together

while(grade < 0 || grade > points)//decision making statement to determine if user entered correct values

{
cout<<fname <<" YOU ENTERED A INVALID VALUE"<<endl;
cout<<"Enter number between 0 and "<<points<<endl;
cin >> grade;

}

cout<<"Do you have another grade? <Y> or <y> yes";
cout<<"\nOr click <N> or <n> to continue to next screen"<<endl;

cin>> in1;//determines if user will leave the loop



}
avg = (finalGrade/totalPoints)*100;//Determines average

system("cls");
cout << setprecision(1);//sets decimal places
cout <<fixed<<showpoint;
cout <<fname <<" You have " <<numOfTest<< " grade(s) entered"<<endl;
cout <<" \nYour Average is: "<<avg<<"%"<<endl;
cout <<endl;
cout <<"Total Points possible: "<<totalPoints<<endl;
cout <<endl;
cout <<"Total points earned: "<<finalGrade<<endl;
cout <<endl;


if(avg <= 100.99 && avg >= 94.00)//determines grade
cout<<fname << " Your grade is a A"<<endl;
else
if(avg <= 93.99 && avg >= 90.00)
cout<<fname << " Your grade is a A-"<<endl;
else
if(avg <= 89.99 && avg >= 87.00)
cout<<fname << " Your grade is a B+"<<endl;
else
if(avg <= 86.99 && avg >= 83.00)
cout<<fname << " Your grade is a B"<<endl;
else
if(avg <= 82.99 && avg >= 80.00)
cout<<fname << " Your grade is a B-"<<endl;
else
if(avg <= 79.99 && avg >= 77.00)
cout<<fname << " Your grade is a C+"<<endl;
else
if(avg <= 76.99 && avg >= 73.00)
cout<<fname << " Your grade is a C"<<endl;
else
if(avg <= 72.99 && avg >= 70.00)
cout<<fname << " Your grade is a C-"<<endl;
else
if(avg <= 69.99 && avg >= 66.00)
cout<<fname << " Your grade is a D+"<<endl;
else
if(avg <= 65.99 && avg >= 60.00)
cout<<fname << " Your grade is a D"<<endl;
else
if(avg <= 59.99 && avg >= 0)
cout<<fname << " Your grade is a E"<<endl;


fname, lname;
avg = 0;
grade = 0;
finalGrade = 0;
points = 0;
totalPoints = 0;
letterGrade;
out1 = 'y';
in1 = 'Y';


cout<<"\nWould you like to continue to run this grading program <Y> or <y>"<<endl;
cout<<"OR enter <N> or <n> to exit"<<endl;
cin>>out1;
}


return 0;
}[/code]
Last edited on
AbstractionAnon (6954)
I find the easiest way to do this is to use a function.
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int get_points ()
{   int points;

    do
    {  cout<<"\nPlease enter the grade point value of the assignment:" <<endl; 
        cin >>points; 
    }   
    while (points <= 0 || points > 100);  // Or whatever your criteria are
    return points;
}

The function doesn't return unless the value is valid. This also simplifies your main line logic.

If you have a number of integer value to ask for, you generalize the routine: 
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int get_int (const string & prompt, int min, int max)
{   int value;

    do
    {   cout << prompt << endl;  
        cin >> value;   
    }          
    while (value < min || value > max) 
    return value; 
}


Line 122, 128: These statements don't do anything.

PLEASE USE CODE TAGS (the <> formatting button) when posting code.
It makes it easier to read your code and also easier to respond to your post.
http://www.cplusplus.com/articles/jEywvCM9/
Hint: You can edit your post, highlight your code and press the <> formatting button.

Last edited on
fresh716 (8)
I'm sorry I never used the do function would I have to declare it as a new variable?
AbstractionAnon (6954)
do while is a type of loop. It is not a function or variable.
http://www.cplusplus.com/doc/tutorial/control/

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  do
  { <statements> 
  }
  while ( <condition> );

fresh716 (8)
I was able to get the program to work correctly by moving the calculations down. Thank you for your help

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//This program will calculate and display student letter grade
#include <iostream>
#include <iomanip> //needed for manipulating output
#include <cmath>
#include <cstdlib>//needed to clear screen
#include <string>

using namespace std;


int main()
{


	
	//Declare and initialize variables
	double avg = 0;
	double grade = 0;
	double finalGrade = 0;
	double points = 0;
	double totalPoints = 0;
	int numOfTest= 0;
	char letterGrade;
	char out1 = 'y';
	char in1 = 'Y';
	string fname, lname;
	
	cout<<"Would you like to use this grading program ? <Y> or <y>"<<endl;
	cout<<"OR enter <N> or <n> to exit"<<endl;
	cin>>out1;
    while(out1== 'Y'|| out1 =='y')//allows user to enter or exit program
		
{
	
	system("cls");//clears screen
	cout <<"Please enter your first name: " <<endl;
	cin  >>fname;//user enters name
	cout <<"\nPlease enter your last name: " <<endl;
	cin  >>lname;
	system("cls");
	while(in1== 'Y' || in1== 'y')
{
	
	cout << fname<<","<<endl;
	cout<<"\nPlease enter the grade point value of the assignment:" <<endl;
	
	cin  >>points;
			
	cout <<"\nPlease enter your score:"<<endl;
	cin >> grade;
	
	
	if(grade < 0 || grade > points)
	{
	
		while(grade < 0 || grade > points)//decision making statement to determine if user entered correct values
		
	{		
		cout<<fname <<" YOU ENTERED A INVALID VALUE"<<endl;
		cout<<"Enter number between 0 and "<<points<<endl;
		cin >> grade;
		
	}
	}
	
		
	cout<<"Do you have another grade? <Y> or <y> yes";
	cout<<"\nOr click <N> or <n> to continue to next screen"<<endl;
	
	cin>> in1;//determines if user will leave the loop
	
	
	
}
			finalGrade = finalGrade + grade;//adds grade totals together
			totalPoints = totalPoints+points;//Adds point total
			numOfTest++;//adds number of grades entered
			avg = (finalGrade/totalPoints)*100;//Determines average
		 
	system("cls");
	cout << setprecision(1);//sets decimal places
    cout <<fixed<<showpoint;
    cout <<fname <<" You have " <<numOfTest<< " grade(s) entered"<<endl;
	cout <<" \nYour Average is: "<<avg<<"%"<<endl;
	cout <<endl;
    cout <<"Total Points possible: "<<totalPoints<<endl;
    cout <<endl;
    cout <<"Total points earned: "<<finalGrade<<endl;
    cout <<endl;
	
			
	if(avg <= 100.99 && avg >= 94.00)//determines grade
		cout<<fname << " Your grade is a A"<<endl;
	else
	if(avg <= 93.99 && avg >= 90.00)
		cout<<fname << " Your grade is a A-"<<endl;
	else
	if(avg <= 89.99 && avg >= 87.00)
		cout<<fname << " Your grade is a B+"<<endl;
	else
	if(avg <= 86.99 && avg >= 83.00)
		cout<<fname << " Your grade is a B"<<endl;
	else
	if(avg <= 82.99 && avg >= 80.00)
		cout<<fname << " Your grade is a B-"<<endl;
	else
	if(avg <= 79.99 && avg >= 77.00)
		cout<<fname << " Your grade is a C+"<<endl;
	else
	if(avg <= 76.99 && avg >= 73.00)
		cout<<fname << " Your grade is a C"<<endl;
	else
	if(avg <= 72.99 && avg >= 70.00)
		cout<<fname << " Your grade is a C-"<<endl;
	else
	if(avg <= 69.99 && avg >= 66.00)
		cout<<fname << " Your grade is a D+"<<endl;
	else
	if(avg <= 65.99 && avg >= 60.00)
		cout<<fname << " Your grade is a D"<<endl;
	else
	if(avg <= 59.99 && avg >= 0)
		cout<<fname << " Your grade is a E"<<endl;
		
		
	fname, lname;	
	avg = 0;
	grade = 0;
	finalGrade = 0;
	points = 0;
	totalPoints = 0;
	letterGrade;
	out1 = 'y';
	in1 = 'Y';
	
	
	cout<<"\nWould you like to continue to run this grading program <Y> or <y>"<<endl;
	cout<<"OR enter <N> or <n> to exit"<<endl;
	cin>>out1;
}
			
		
	
	return 0;
}[code]
[/code]
Last edited on
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