C库函数执行排序 [英] C library function to perform sort

问题描述

C标准库中是否有可用的库函数来进行排序?

Is there any library function available in C standard library to do sort?

推荐答案

qsort()是您要查找的函数.您可以使用指向数据数组的指针，该数组中元素的数量，每个元素的大小以及比较函数来调用它.

qsort() is the function you're looking for. You call it with a pointer to your array of data, the number of elements in that array, the size of each element and a comparison function.

它发挥了魔力，您的数组就地排序.下面是一个示例:

It does its magic and your array is sorted in-place. An example follows:

#include <stdio.h>
#include <stdlib.h>
int comp (const void * elem1, const void * elem2) 
{
    int f = *((int*)elem1);
    int s = *((int*)elem2);
    if (f > s) return  1;
    if (f < s) return -1;
    return 0;
}
int main(int argc, char* argv[]) 
{
    int x[] = {4,5,2,3,1,0,9,8,6,7};

    qsort (x, sizeof(x)/sizeof(*x), sizeof(*x), comp);

    for (int i = 0 ; i < 10 ; i++)
        printf ("%d ", x[i]);

    return 0;
}

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