First-Project/first.c at master · CherryRum/First-Project · GitHub

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#include <stdio.h>
#include <stdlib.h>

#define NUM 40
void fillarray(double ar[], int n);
void showarray(const double ar[], int n);
int mycomp(const void * p1, const void * p2);

int main(void)
{
	double vals[NUM];
	fillarray(vals, NUM);
	puts("Random list:");
	showarray(vals, NUM);
	qsort(vals, NUM, sizeof(double), mycomp);
	puts("\nSorted list: ");
	showarray(vals, NUM);
	return 0;
}
void fillarray(double ar[], int n)
{
	int index;

	for (index = 0; index < n; index++)
		ar[index] = (double)rand() / ((double)rand() + 0.1);

}
void showarray(const double ar[], int n)
{
	int index;
	for (index = 0; index < n; index++)
	{
		printf("%9.4f ", ar[index]);
		if (index % 6 == 5)
			putchar('\n');

	}
	if (index % 6 != 0)
		putchar('\n');

}
int mycomp(const void * p1, const void * p2)
{

	const double * a1 = (const double *)p1;
	const double * a2 = (const double *)p2;
	if (*a1 < *a2)
		return -1;
	else if (*a1 == *a2)
		return 0;
	else
		return 1;

}