Thread: Sort numbers in order in C programming.

Okay, so here's my question:

Write a program that orders three double numbers by increasing value. The program
should include a function named sort3 that takes three double * arguments (pointer
to double). The function prototype is
void sort3(double *x, double *y, double *z);
The function should reorder the values pointed to by its arguments so that after the call
sort3(&x, &y, &z);
the numbers satisfy .
Your program should input data and print results using the following format:
Enter three numbers: 4.7 1.4 3.2
The ordered sequence is: 1.4 3.2 4.7

And here is my program:
C code - 32 lines - codepad

I am getting a lot of errors when I run it through GCC. Can someone help me out here ASAP?
Oh and I can only use pointers.

Please post your code here, as plain text, properly indented and formatted. Make sure you use code tags: [code]Your code here[/code].

Also, please post your exact error messages (copy-paste) with line numbers.

Well, the obvious error is that you're not dereferencing your pointers

Originally Posted by whiteflags

Three numbers is enough to sort the normal way:

Code:

int dbl_comp (const void *x, const void *y)
    {
    double item1 = (*(double *) x), item2 = (*(double *) y);
    return item1 < item2 ? -1 : item1 > item2 ? 1 : 0;
    }


double foo[] = {x, y, z};
qsort (foo, 3, sizeof (foo[0]), &dbl_comp);

I doubt the exercise would allow the use of qsort()... Otherwise what would be the point?