Homework & Coursework Questions

driver.o: In function `main':
driver.c:(.text+0x34): undefined reference to `swap'
driver.c:(.text+0x48): undefined reference to `swap'
driver.c:(.text+0x5c): undefined reference to `swap'
collect2: ld returned 1 exit status
make: *** [swapbig] Error 1

#include "swapbig.h"

void swap_big(float *a, float *b)
{

   float temp;

        if ( temp <= *a )
        {temp = *a;
         *a = *b;
        *b = temp;
        }
printf(" %x, contents %f\n", a, *a);
printf(" %x, contents %f\n", b, *b);
}

swapbig.h
#include <stdio.h>

/* Given two pointer values (floats) and swap the values in cell pointed
 * return the swap value, the first has to be less than or equal to the second*/

void swap_big(float *a, float *b);

#include "swapbig.h"
//#define DEBUG

int main()
{

        #ifdef DEBUG
        printf("Initial values:\t a = %f, b = %f, c = %f\n",a, b, c);
        #endif

        swap_big(&a, &b);

        #ifdef DEBUG
        printf("First swap:\t a = %f, b = %f, c = %f\n",a, b, c);
        #endif

        swap_big(&b, &c);

        #ifdef DEBUG
        printf("Second swap:\t a = %f, b = %f, c = %f\n",a, b, c);
        #endif

        swap_big(&a, &b);

        #ifdef DEBUG
        printf("Third swap:\t a = %f, b = %f, c = %f\n",a, b, c);
        #endif

}

# target to make all programs for Lab 12
 all: swap swapbig reorder

# Problem 1 - swap programs
#complete the dependency and action lines for your filenames
swap: swaptest.o swap.o
        cc swaptest.o swap.o -o swap

swaptest.o: swap.h

swap.o: swap.h

# Problem 2 - swapbig programs
swapbig:swapbig.o
        cc driver.o swapbig.o -o swapbig

driver.o: swapbig.h

swapbig.o: swapbig.h

# Problem 3 - reorder programs
reorder: reorder.o
        cc driver1.o  reorder.o -o reorder

driver1.o: reorder.h

reorder.o: reorder.h

# source file dependencies
# add target lines showing dependencies for your .o files


# utility targets

clean:
        rm -f *.o

real_clean: clean
        rm -f swap swapbig reorder