If else /else if problem

This is a discussion on If else /else if problem within the C++ Programming forums, part of the General Programming Boards category; Ok so, I feared this would happen when I compiled and ran, and surely enough it did. I'm getting a ...

  1. #1
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    If else /else if problem

    Ok so, I feared this would happen when I compiled and ran, and surely enough it did.
    I'm getting a logical error within this program and i cant figure out how to fix it. I want to make it so that when I enter any of the numbers between 0 - 19, 20 - 39, 40 - 59, or 60+, it will only do the calculation of the entered number by the specific decimal value assigned to that group of numbers. Take a look at my code and you'll understand what im talking about

    Code:
    
    #include <iostream>
    using namespace std;
    
    
    int main()
    {
    	
    
    	double checkAmount;
    	int monthBankCharge = 10;
    	cout << "Enter the amount of checks you've written in the past month\n"; 
    
    	cin >> checkAmount;
    
    	if (checkAmount < 20)
    	{ cout << checkAmount * 0.10 << endl;}
    
    	else if (checkAmount >= 20)
    	{ cout << checkAmount * 0.08 << endl;}
    
    	else if (checkAmount >= 40)
    	{ cout << checkAmount * 0.06 << endl;}
    
    	else if (checkAmount >= 60)
    	{ cout << checkAmount * 0.04 << endl;}
    
    
     
     system("pause");
    	return 0;
    }

  2. #2
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    If checkAmount == 43 then the first if(checkAmount < 20) will not execute but since 43 > 20 the next if statement will execute and the rest of the statements will be skipped. You may want to rearrange your else if clauses. Maybe switch the >= 20 with >= 60.

    Jim

  3. #3
    C++ Witch laserlight's Avatar
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    Consider input such that checkAmount = 70. Then, trace the flow of control of the program, line by line. What do you observe?
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  4. #4
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    The question says:

    A bank charges $10 per month plus the following check fees for a commercial checking account:
    $0.10 each for fewer than 20 checks
    $0.08 each for 20-39 checks
    $0.06 each for 40-59 checks
    $0.04 each for 60 or more checks

    write a program that asks for the number of checks written during the past month, then computes and displays the bank's fees for the month.

  5. #5
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    never mind I finally figured it out. Thanks to all that helped (:

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