rounder routine

This is a discussion on rounder routine within the C++ Programming forums, part of the General Programming Boards category; Do people have a usual function they use when rounding floats off to two decimal places (in order to represent ...

  1. #1
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    rounder routine

    Do people have a usual function they use when rounding
    floats off to two decimal places (in order to represent
    monetary amounts)?

    I am asking because my program takes a percentage of a
    dollar and cents amount, which can give a result of more
    than two decimal places.

    A friend suggested that I preserve the amount and just
    print a rounded-off amount to screen. Good idea?

    Miki
    Ustuzou@sympatico.ca

  2. #2
    Registered User C_Coder's Avatar
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    A friend suggested that I preserve the amount and just
    print a rounded-off amount to screen.
    Sounds like a good idea
    Code:
    #include <stdio.h>
    
    int main(void)
    {
       float num = 10.53456;
    
       printf("%.2f", num);   // The .2 specifies the number of decimal places
    
       return 0;
    }
    All spelling mistakes, syntatical errors and stupid comments are intentional.

  3. #3
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    Thanks. I have two more questions.

    First, does that code round up in case of a third decimal
    place that is 5 or more?

    Second, can you use <cstdio> instead of <stdio.h> in C++
    programs, as I prefer the newer header files?

    Miki
    ustuzou@sympatico.ca

  4. #4
    Registered User C_Coder's Avatar
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    First, does that code round up in case of a third decimal
    place that is 5 or more?
    Yup, change the value to 10.53656 and try it.
    Second, can you use <cstdio> instead of <stdio.h> in C++
    programs
    If you want to use cstdio try it, it will either work or it won't
    All spelling mistakes, syntatical errors and stupid comments are intentional.

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