compound interest, need help

This is a discussion on compound interest, need help within the C Programming forums, part of the General Programming Boards category; this is a program i wrote to count the compound interest, but it's not working it's giving me following error ...

  1. #1
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    compound interest, need help

    this is a program i wrote to count the compound interest, but it's not working it's giving me following error message when i compile
    "compound.c:(.text+0x69): undefined reference to `pow'
    collect2: ld returned 1 exit status"

    following the code
    Code:
         #include <stdio.h>
         #include <math.h>
    
         int mian()
         {
    
             int rate;
             int amount;
             int p;
             int n;
             p=24;
             printf("Rate\t\tAmount");
    
             for(rate=5;rate<=10;rate++){
    
                for(n=1; n<=381; n++){
                   amount=p*pow(1+(rate/100),n);
                   printf("%d\t\t%d", rate,amount);
                  }
             }
               return 0;
         }

  2. #2
    and the hat of wrongness Salem's Avatar
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    Well your code isn't a copy/paste of your code, you spelt main wrong.

    In any case, you need to compile with
    gcc prog.c -lm

    The last bit is "minus-el-em".
    It tells the linker to also include the math library, where pow() will be defined.
    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.
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    Quote Originally Posted by Salem View Post
    Well your code isn't a copy/paste of your code, you spelt main wrong.

    In any case, you need to compile with
    gcc prog.c -lm

    The last bit is "minus-el-em".
    It tells the linker to also include the math library, where pow() will be defined.
    Thank for your help, but when i am compiling its telling me "NO SUCH FILE OR DIRECTORY"
    this how i am compiling gcc compound.c -lm compound

  4. #4
    Deathray Engineer MacGyver's Avatar
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    gcc compound.c -lm compound
    And what file, pray tell, is compound? Did you mean this?

    gcc compound.c -lm -o compound

  5. #5
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    Thanks for you help it's compiling now but result is not what I want. It's giving me some weird number. once last time just check the coding and see if everything seem correct.

  6. #6
    ZuK
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    Code:
    rate/100
    this is integer division and the result is 0 for your rate values
    use sth. like this
    Code:
    amount=p*pow(1+(rate/100.0),n);
    Kurt

  7. #7
    Frequently Quite Prolix dwks's Avatar
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    -l options should be the last on the list. They don't affect any arguments to their right.

    Also consider adding a '\n' to the end of your printf(), or another '\t' or something. Otherwise the numbers will run together.
    dwk

    Seek and ye shall find. quaere et invenies.

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    this program of mine is not working, please help me fix it. Its not giving what I am expecting.

  9. #9
    and the hat of wrongness Salem's Avatar
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    Well what is your latest code?
    What numbers do you enter for input?
    What numbers do you get for output?
    What numbers were you expecting?
    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.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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