Thread: help with mathematical problem in C

  1. #1
    Registered User
    Join Date
    Sep 2006

    help with mathematical problem in C


    i am new to this forum and C language too. This actually is my first post. I need help with performing this mathematical operation in C.

    B(X5 + Y3 + Z3)/7 where X,Y,Z are input data from the keyboard and B=4.

    PLS, X5,Y3,Z3 implies X raised to the power of 5, Y raised to the power of 3 and Z raised to the power of 3.

    Hope to hear from someone soon.


  2. #2
    Just Lurking Dave_Sinkula's Avatar
    Join Date
    Oct 2002
    multiplication is done with *, exponentiation with the function pow.
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  3. #3
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    > X5

    > B(X5
    Would be
    B * ( pow(x,5)

    Just have
    #include <math.h>
    and see what you can come up with.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  4. #4
    Frequently Quite Prolix dwks's Avatar
    Join Date
    Apr 2005
    You may also have to link with the math library; for GCC, add -lm to the end of the command line.
    $ cat 2pow20.c
    #include <stdio.h>
    #include <math.h>
    int main(void) {
        double x = 2.0, y = 20.0;
        printf("%f\n", pow(x, y));
        return 0;
    $ gcc -W -Wall -ansi -pedantic -O2 2pow20.c -o 2pow20 -lm
    $ ./2pow20

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