Complex Number Implementation

This is a discussion on Complex Number Implementation within the C Programming forums, part of the General Programming Boards category; Here is my code for a program that adds and multiplies two complex numbers: main.c Code: #include <stdio.h> #include "complex.h" ...

  1. #1
    Drunken Progammer CaptainMorgan's Avatar
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    Complex Number Implementation

    Here is my code for a program that adds and multiplies two complex numbers:

    main.c
    Code:
    #include <stdio.h>
    #include "complex.h"
     
    int main ( int argc , char *argv[] ) {
     
      comp *ptr1, *ptr2, *j, *k, *sum, *product;
      double r, i;
     
      printf ( "Enter first complex number-\n" );
      printf ( "Enter real part: " );
      scanf  ( "%d",  &r );
      printf ( "Enter imaginary part: " );
      scanf  ( "%d",  &i );
     
      load_complex ( ptr1, r, i );
       
      printf ( "Enter second complex number-\n" );
      printf ( "Enter real part: " );
      scanf  ( "%d",  &r );
      printf ( "Enter imaginary part: " );
      scanf  ( "%d",  &i );
     
      load_complex ( ptr2, r, i );
     
      add_complex  ( sum, ptr1, ptr2 );
      retrieve_complex ( sum, j, k );
     
      printf ( "Sum is %lf%lf\n", sum->real, sum->imaginary );
       
      multiply_complex ( product, ptr1, ptr2 );
      retrieve_complex ( product, j, k );
     
      printf ( "Product is %lf%lf\n", product->real, product->imaginary );
     
      return ( 0 );
     
    }
    complex.h and complex.c:
    Code:
    /*
      complex.h
    */
     
    typedef struct {
      double real;
      double imaginary;
    } comp;
     
    extern void load_complex ( comp *p_complex, double real,
    					double imaginary );
     
    extern void retrieve_complex ( comp *p_complex, double *p_real,
    						double *imaginary );
     
    extern void add_complex ( comp *p_sum, comp *p_complex1,
    				   comp *p_complex2 );
     
    extern void multiply_complex ( comp *p_product, comp *p_complex1,
    						comp *p_complex2 );
    }
    
    /*
      complex.c
    */
     
    #include "complex.h"
     
    extern void load_complex ( comp *p_complex, double real, double imaginary ) {
     
      p_complex->real = real;
      p_complex->imaginary = imaginary;
     
    }
     
    extern void retrieve_complex ( comp *p_complex, double *p_real,
    						double *p_imaginary ) {
     
      *p_real = p_complex->real;
      *p_imaginary = p_complex->imaginary;
     
    }
     
    extern void add_complex ( comp *p_sum, comp *p_complex1, comp *p_complex2 ) {
     
      p_sum->real = p_complex1->real + p_complex2->real;
     
      p_sum->imaginary = p_complex1->imaginary + p_complex2->imaginary;
     
    }
     
    extern void multiply_complex ( comp *p_product, comp *p_complex1,
    						comp *p_complex2 ) {
     
      p_product->real = p_complex1->real * p_complex2->real -
    	p_complex1->imaginary * p_complex2->imaginary;
     
      p_product->imaginary = p_complex1->real * p_complex2->imaginary *
    	p_complex1->imaginary * p_complex2->real;
     
    }


    I'm receiving seg faults at the load_complex function ( gdb ), but I don't know what's wrong with the function. Originally, I was able to enter two complex numbers and then it seg faulted at retrieve, but for some reason now it's seg'n at the load's.. any ideas?

  2. #2
    Guest Sebastiani's Avatar
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    well, since a pointer is just a variable that contains an address - the object at that address has to exist for the pointer to be valid!

    Code:
    comp cmp1;
    load_complex ( &cmp1, r, i );
    Code:
    if( numeric_limits< byte >::digits != bits_per_byte )
        error( "program requires bits_per_byte-bit bytes" );
    24bbs.cpp

  3. #3
    Drunken Progammer CaptainMorgan's Avatar
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    Quote Originally Posted by Sebastiani
    well, since a pointer is just a variable that contains an address - the object at that address has to exist for the pointer to be valid!
    d'oh.. thank you.

    Cheers

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