How do i set my code up for a invalid output

Question

0.00/5 (No votes)

See more:

i made a program that gives you a letter grade and average when you enter a number from 0 to 100. I'm missing one piece where the user inputs a number outside of 0 to 100. the output is suppose to look like this

Example output 1 (invalid input, input is in bolded italics):
GPA Conversion
- - - - - - -
Enter your grade: -10.2
You have not entered an grade between 0 and 100. Ending program.

every code i tried doesn't result in what im suppose to get above if i put an invalid number below 0 or over 100.

What I have tried:

C++

 #include <iostream>
 #include <string>
 using namespace std;

int main()
{

    float grade;
    cout.precision(2);

    cout << "GPA Conversion" << endl;
    cout << "--------------" << endl;
    cout << "Enter your grade: ";
    cin >> grade;
    cout << endl;

    if ( grade <=100 && grade  >=96)
        cout << "You will receive a letter grade of A with a 4.00 GPA.";

    if ( grade <=95 && grade  >=90)
        cout << "You will receive a letter grade of A- with a 3.70 GPA.";

    if ( grade <=89 && grade  >=87)
        cout << "You will receive a letter grade of B+ with a 3.30 GPA.";

    if ( grade <=86 && grade  >=84)
        cout << "You will receive a letter grade of B with a 3.00 GPA.";

    if ( grade <=83 && grade  >=80)
        cout << "You will receive a letter grade of B- with a 2.70 GPA.";

    if ( grade <=79 && grade  >=77)
        cout << "You will receive a letter grade of C+ with a 2.30 GPA.";

    if ( grade <=76 && grade  >=74)
        cout << "You will receive a letter grade of C with a 2.00 GPA.";

    if ( grade <=73 && grade  >=70)
        cout << "You will receive a letter grade of C- with a 1.70 GPA.";

    if ( grade <=69 && grade  >=67)
        cout << "You will receive a letter grade of D+ with a 1.30 GPA.";

    if ( grade <=66 && grade  >=64)
        cout << "You will receive a letter grade of D with a 1.00 GPA.";

    if ( grade <=63 && grade  >=60)
        cout << "You will receive a letter grade of D- with a 0.70 GPA.";

    if ( grade <=59 && grade  >=0)
        cout << "You will receive a letter grade of F with a 0.00 GPA.";






    return 0;
}

Posted 23-Feb-16 0:31am

Member 12329656

Updated 23-Feb-16 2:51am

CPallini

v2

Add a Solution

Comments

Jochen Arndt 23-Feb-16 6:43am

You should learn about the C/C++ keyword 'else'.

glen205 23-Feb-16 6:51am

Your code contains no less than twelve conditional -> output i.e.
if (condition to test)
cout << "output string";

After writing that 12 times, can you see a pattern and infer that it's possible to write the test/conditional statements (and output strings) for grade > 100 and grade < 0?

Aescleal 23-Feb-16 7:00am

You might want to see what the output is happens if someone enters 76.5

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Jochen Arndt · Answer 1 · 2016-02-23T00:47:00

Solution 1

See Statements and flow control - C++ Tutorials[^] to learn about the selection statements if and else.

Posted 23-Feb-16 0:47am

Jochen Arndt

CPallini · Answer 2 · 2016-02-23T02:50:00

The 'find right interval' is usually implemented this way:

C++

int grade; // looking at you code, grade should be an integer. 
//...
if (grade > 100) 
{// error, input out of range, too high
}
else if (grade >= 96) 
{// this handles 96 <= grade <= 100
  cout << "You will receive a letter grade of A with a 4.00 GPA.";
}
else if (grade >= 90)
{// this handles 90 <= grade <= 95
 //..
}
//..
else if ( grade >= 0)
{ // this handles 0 <= grade <= 59
}
else
{ // error, input out of range, too low
}