小编ibr*_*mG.的帖子

我是C的初学者.我正在尝试解决一些问题.当我编译代码时,我收到此错误.

[错误]从'void*'无效转换为'triangle*'[-fpermissive]

代码和目的解释如下.

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

struct triangle
{
    int a;
    int b;
    int c;
};

typedef struct triangle triangle;

//sort_by_area() function is here
int main()
{
    int n;
    scanf("%d", &n);
    triangle *tr = malloc(n * sizeof(triangle));
    for (int i = 0; i < n; i++) {
        scanf("%d%d%d", &tr[i].a, &tr[i].b, &tr[i].c);
    }
    sort_by_area(tr, n);
    for (int i = 0; i < n; i++) {
        printf("%d %d %d\n", tr[i].a, tr[i].b, tr[i].c);
    }
    return 0;
}

正如你所看到我有结构,我试图用输入的数量为它分配内存.并尝试将其用于sort_by_area功能.但问题是 …