Thread: Sorting the numbers

Hello!! Its been two weeks since I started to study programming. I need to program that asks the user to input three numbers, and then outputs the numbers from the largest to the smallest. For example, if the input is 23 5 15, the output is 23 15 5.

Should I use bubble sort or qsort? I dont know where to begin. I need some friendly advices.

Qsort is overkill for sorting a very small number of items. Not the fastest sorter either.

Here's an easy sorter (not quite bubble sort, but like it, and just a tad faster). To use it, you should have an array of int's with your numbers in a[0], a[1], and a[2], and #define SIZE 3
just below the include file listing in your program

Code:

for(i=0; i<SIZE-1;i++) {
  for(j=i+1;j<SIZE; j++) {
    if(a[i] > a[j]) {
      temp = a[i];
      a[i] = a[j];
      a[j] = temp;
    }
  }
}

Whats the error in the code below?

Code:

#include <stdio.h>
#include <stdlib.h>
#define MAX 3

int intcmp(const void *v1, const void *v2);
 
main()
{
     int i, arr[MAX];
     
   
     //Asks the user to input three interger numbers
     
     printf("Enter %d integer values; press Enter after each.\n", MAX);
     
     for (i = 0; i < MAX; i++)
         scanf("%d", &arr[i]);
    
         
     //Sort the array into ascending order.

     qsort(arr, MAX, sizeof(arr[1]), intcmp);
     
     //Display the sorted array.

     for (i = 0; i < MAX; i++)
         printf("\n%d", i, arr[i]);
     
     
}


int intcmp(const void *v1, const void *v2)
{
	int cmpvalue1, cmpvalue2;

	cmpvalue1 = *(int*)v1;
	cmpvalue2 = *(int*)v2;

	return cmpvalue1 - cmpvalue2;
	
}