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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
Updated 23-Feb-16 2:51am
v2
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

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