Looking for a mentor, of sorts

This is a discussion on Looking for a mentor, of sorts within the C Programming forums, part of the General Programming Boards category; I've always wanted to know: Is it better to store financila data as a float: eg. 19.99 or as an ...

  1. #16
    Registered User wintellect's Avatar
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    I've always wanted to know:

    Is it better to store financila data as a float: eg. 19.99
    or as an int: eg 1999

    (both values are to represent the same some of money)

    Which would be better to keep more acurate information?

  2. #17
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    Quote Originally Posted by wintellect
    I've always wanted to know:

    Is it better to store financila data as a float: eg. 19.99
    or as an int: eg 1999

    (both values are to represent the same some of money)

    Which would be better to keep more acurate information?
    I've always wondered this too, but I just use float for simplicity and have never encountered any problems.

  3. #18
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    WaltP: why remove the if statement? the program is more efficient without it, there's no point in using a function if you're passing it nothing to process.

    AFAIK financial corporations use base-10 floating points, but it's a good habit to use doubles over floats unless you have a specific reason (some floats give truncated results when being passed to an int).

  4. #19
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    WaltP:
    Thanks for the feedback. My original attempt does calculaye the pay correctly, but I can see what you mean about it being slower, so I went back and changed it to this:
    Code:
    #include <stdio.h>
    
    int main()
    {
    	float fHours = 0.0;
    	float fPayRate = 0.0;
    	double dTotalPay = 0.0;
    
    	puts("Please enter number of hours worked:");
    	scanf("%f", &fHours);
    
    	puts("Please enter hourly pay rate:");
    	scanf("%f", &fPayRate);
    	
    	//if overtime, calculate overtime pay
    	if(fHours > 40.0)
    	{
    		dTotalPay = (fHours - 40.0) * (fPayRate * 1.5);
    		fHours = 40.0;
    	}
    	
    	//calculate regular pay, add overtime if applicable
    	dTotalPay += fHours * fPayRate;
    
    	printf("The Employee earned $%g ", dTotalPay);
    	
    	return 0;
    }
    what do you think?

  5. #20
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    Quote Originally Posted by wintellect
    I've always wanted to know:

    Is it better to store financila data as a float: eg. 19.99
    or as an int: eg 1999

    (both values are to represent the same some of money)

    Which would be better to keep more acurate information?
    For the financial data to be accurate, you have to use some type of int (int, long, long long). My guess is you would simply store the amounts in cents. Then to print you'd use (amount / 100) and (amount % 100).

    A double or float can't represent every decimal number exactly, so if you need 100% accuracy, you must use something else.

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