xdm,可以看看我的代码哪里有问题吗，最后一个给了红

CR7syn @ 2022-11-23 15:30:37

#include<stdio.h>
#include<string.h>
#include<math.h>
typedef struct date {
    float a;
    float b;
}node;
int main()
{

    int i;
    int c;
    int e;
    double dis=0;
    node d[3];
    scanf("%f %f", &d[0].a, &d[0].b);
    scanf("%f %f", &d[1].a, &d[1].b);
    scanf("%f %f", &d[2].a, &d[2].b);
    for (i = 0; i < 3; i++)
    {
        c = d[i % 3].a - d[(i + 1) % 3].a;
        e = d[i % 3].b - d[(i + 1) % 3].b;
        dis += sqrt(c * c + e * e);
    }
    printf("%.2lf", dis);

}

by NightStriker @ 2022-11-23 15:48:48

@CR7syn 看看是否需要 double / long long 等数据类型。

by CR7syn @ 2022-11-23 15:56:51

@ljp 我把数据类型都改成double了，还是会出现一个wa

by ChampionYoung @ 2022-11-23 16:11:09

@CR7syn 能发下改之后的代码吗

by ChampionYoung @ 2022-11-23 16:16:40

@CR7syn 不用了， int c, e 改成 double c, e

by liuzr156 @ 2022-11-23 16:32:12

@CR7syn 两个地方第一把除了i之外全改成double类型

第二输入改成scanf("%lf %lf", &d[i].a, &d[i].b);

最后附赠亲手改的

#include<stdio.h>
#include<string.h>
#include<math.h>
typedef struct date {
    double a;
    double b;
}node;
int main()
{

    int i;
    double c;
    double e;
    double dis=0;
    node d[4];
    scanf("%lf %lf", &d[0].a, &d[0].b);
    scanf("%lf %lf", &d[1].a, &d[1].b);
    scanf("%lf %lf", &d[2].a, &d[2].b);
    for (i = 0; i < 3; i++)
    {
        c = d[i % 3].a - d[(i + 1) % 3].a;
        e = d[i % 3].b - d[(i + 1) % 3].b;
        dis += sqrt(c * c + e * e);
    }
    printf("%.2lf", dis);

}

by CR7syn @ 2022-11-23 17:30:37

谢谢各位了，眼瞎了不好意思