Thread: Help with a couple compiler errors

  1. #1
    Registered User
    Join Date
    Mar 2005
    Posts
    60

    Help with a couple compiler errors

    Greetings,
    I'm kind of new to the C language and I had to write a program that computes a monthly payment. I'm using the gcc compiler and when I run the compile, I get the following messages:

    loan.c: In function "int main":
    loan.c:34: error: too few arguments to function 'pow'

    Any ideas? Here is my code:

    Code:
         /*
             Filename: loan.c
             Description: The monthly payment for an installment loan.
         */
    
    
    #include <stdio.h>
    #include <math.h>
    
     int main()
    
      {
    
          /* memory allocation for data */
    
          double monthlypayment;
          double principal;
          double rate;
          int months;
    
          /* prompt user for data */
    
      printf ("Enter the principal amount of the loan:");
      scanf  ("%lf",& principal);
    
      printf ("Enter the yearly interest rate (eg.0.05):");
      scanf  ("%lf",& rate);
    
      printf ("Enter the total number of payments in months:");
      scanf  ("%d",& months);
    
           /* compute monthly payment */
    
           monthlypayment = principal*(rate/12)/1-pow(1+rate/12)-months;
    
           /* display result */
    
      printf ("Your monthly payment will be: $%lf/n",monthlypayment);
    
           /* End */
    
     return 0;
    
      }

  2. #2
    Registered Luser cwr's Avatar
    Join Date
    Jul 2005
    Location
    Sydney, Australia
    Posts
    869
    What are you trying to do?

    pow takes two arguments, for example pow(2,3) will compute 2 raised to the power of 3. You are only giving one argument.

    Edit:

    Also, remember that if you divide by an integer value, the result will be an integer. You probably want rate/12.0
    Last edited by cwr; 09-15-2005 at 10:21 PM.

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