C语言结构体输出的是分数低的，哪里错了 - C语言论坛

已结贴√ 问题点数：20 回复次数：4

C语言结构体输出的是分数低的，哪里错了

#include<stdio.h>
#define N 3
struct xx
{
    char name[20];
    char sex;
    float score[4];
    float peraver;
} stu[N];
void input (struct xx *pstu, int n);
void jisuan (struct xx *pstu, int n, float *pall);
void compare (struct xx *pstu, int n);
void output (struct xx *pstu, int n, float *pall);
int main ()
{
    float allaver;
    input (stu, N);
    jisuan (stu, N, &allaver);
    compare (stu, N);
    output (stu, N, &allaver);

    return 0;
}
计算某班N个学生4门课程的平均成绩，输入姓名，性别，成绩，输出平均成绩高于N个学生总平均成绩的男生的信息
void input (struct xx *pstu, int n)
{
    int i, j;
    for (i = 0; i < n; i++)
    {
        printf ("请输入姓名:\n");
        scanf ("%s", pstu[i].name);
       getchar ();
        printf ("请输入性别:\n");
        scanf ("%c", &pstu[i].sex);
        getchar ();
        for (j = 0; j < 4; j++)
        {
            printf ("请输入成绩:\n");
            scanf ("%f", &pstu[i].score[j]);
        }
    }
}
void jisuan (struct xx *pstu, int n, float *pall)
{
    int i, j;
    float a = 0, b = 0;
    for (i = 0; i < n; i++)
    {
        for (j = 0; j < 4; j++)
        {
            a += pstu[i].score[j];
        }
        pstu[i].peraver = a / 4;
        b += pstu[i].peraver;
    }
    *pall = b / 4;
}

void compare (struct xx *pstu, int n)
{
    int i, j;
    struct xx temp;
    for (i = 0; i < n - 1; i++)
    {
        for (j = i + 1; j < n; j++)
        {
            if (pstu[i].peraver > pstu[j].peraver)
            {
                temp = pstu[i];
                pstu[i] = pstu[j];
                pstu[j] = temp;
            }
        }
    }
}
void output (struct xx *pstu, int n, float *pall)
{
    int i, j;
    for (i = 0; i < n; i++)
    {
        if (pstu[i].peraver < *pall && pstu[i].sex == 'm')
        {
            printf ("%s\t%c\t", pstu[i].name, pstu[i].sex);
            for (j = 0; j < 4; j++)
            {
                printf ("%f\t", pstu[i].score[j]);
            }
            printf ("\n");
        }
    }
}

搜索更多相关主题的帖子: 课程　结构体　 C语言　

第 2 楼

得分:0

回复楼主 yuanxiubao

[ 本帖最后由 A13433758072 于 2011-8-26 03:05 编辑 ]

一步一个脚印...............................默默地前进.....
诚邀乐于解答c菜鸟问题，的热心网友加入， QQ群38490319

第 3 楼

得分:0

回复 2楼 A13433758072

if (pstu[i].peraver < *pall && pstu[i].sex == 'm') 我是说这样，运行结果是输出的比平均分高的分数，为什么？

第 4 楼

得分:20

根据题意，compare函数没必要使用；jisuan函数内两处错误，另外就是那个if语句的错误，修改如下：

程序代码：

//C语言结构体输出的是分数低的，哪里错了
#include<stdio.h>
#define N 3
struct xx
{
    char name[20];
    char sex;
    float score[4];
    float peraver;
} stu[N];
void input (struct xx *pstu, int n);
void jisuan (struct xx *pstu, int n, float *pall);
void compare (struct xx *pstu, int n);
void output (struct xx *pstu, int n, float *pall);
int main ()
{
    float allaver;
    input (stu, N);
    jisuan (stu, N, &allaver);
    //compare (stu, N);
    output (stu, N, &allaver);

    return 0;
}
//计算某班N个学生4门课程的平均成绩，输入姓名，性别，成绩，输出平均成绩高于N个学生总平均成绩的男生的信息
void input (struct xx *pstu, int n)
{
    int i, j;
    for (i = 0; i < n; i++)
    {
        printf ("请输入姓名:\n");
        scanf ("%s", pstu[i].name);
        getchar ();
        printf ("请输入性别:\n");
        scanf ("%c", &pstu[i].sex);
        getchar ();
        for (j = 0; j < 4; j++)
        {
            printf ("请输入成绩:\n");
            scanf ("%f", &pstu[i].score[j]);
        }
    }
}
void jisuan (struct xx *pstu, int n, float *pall)
{
    int i, j;
    float a = 0, b = 0;
    for (i = 0; i < n; i++)
    {
        for (j = 0; j < 4; j++)
        {
            a += pstu[i].score[j];
        }
        pstu[i].peraver = a / 4;
        b += pstu[i].peraver;
        a=0;//a没有初始化
    }
    *pall = b / n;//b应该除以n
}

/*void compare (struct xx *pstu, int n)
{
    int i, j;
    struct xx temp;
    for (i = 0; i < n - 1; i++)
    {
        for (j = i + 1; j < n; j++)
        {
            if (pstu[i].peraver > pstu[j].peraver)
            {
                temp = pstu[i];
                pstu[i] = pstu[j];
                pstu[j] = temp;
            }
        }
    }
}*/
void output (struct xx *pstu, int n, float *pall)
{
    int i, j;
    for (i = 0; i < n; i++)
    {
        if (pstu[i].peraver> *pall && pstu[i].sex == 'm')//此处为>
        {
            printf ("%s\t%c\t", pstu[i].name, pstu[i].sex);
            for (j = 0; j < 4; j++)
            {
                printf ("%f\t", pstu[i].score[j]);
            }
            printf ("\n");
        }
    }
}

A real warrior never quits.

第 5 楼

得分:0

#include<stdio.h>
#define N 3
#include <malloc.h>
struct student
{
    char name[20];
    char sex;
    float score[4];
    float peraver;
} stu[N];
void input (struct student *pstu, int n);
float *jisuan (struct student *pstu, int n);
//void compare (struct student *pstu, int n);
void output (struct student *pstu, int n, float *pall);
int main ()
{
    //float allaver;
    float *p1;
    input (stu, N);
    p1=jisuan (stu, N);
    printf("%f\n",*p1);
    //compare (stu, N);
    output (stu, N, p1);

    return 0;
}
//计算某班N个学生4门课程的平均成绩，输入姓名，性别，成绩，输出平均成绩高于N个学生总平均成绩的男生的信息
void input (struct student *pstu, int n)
{
    int i, j;
    for (i = 0; i < n; i++)
    {
        printf ("请输入姓名:\n");
        scanf ("%s", &pstu[i].name);
       getchar ();
        printf ("请输入性别:\n");
        scanf ("%c", &pstu[i].sex);
        getchar ();
        for (j = 0; j < 4; j++)
        {
            printf ("请输入成绩:\n");
            scanf ("%f", &pstu[i].score[j]);
        }
    }
}
float *jisuan (struct student *pstu, int n)
{
    int i, j;
    float a = 0, b = 0;
    float *p;
    for (i = 0; i < n; i++)
    {
        a=0;
        for (j = 0; j < 4; j++)
        {
            a += pstu[i].score[j];
        }
         //a=0;
         pstu[i].peraver = a / 4;
    }
    for(i=0;i<n;i++)
    {
        b += pstu[i].peraver;
    }
    p=(float*)malloc (100);
    *p=b/3;
    return(p);
}

/*void compare (struct student *pstu, int n)
{
    int i, j;
    struct student temp;
    for (i = 0; i < n - 1; i++)
    {
        for (j = i + 1; j < n; j++)
        {
            if (pstu[i].peraver > pstu[j].peraver)
            {
                temp = pstu[i];
                pstu[i] = pstu[j];
                pstu[j] = temp;
            }
        }
    }
}*/
void output (struct student *pstu, int n, float *pall)
{
    int i, j;
    for (i = 0; i < n; i++)
    {
        if (pstu[i].peraver < (*pall) && pstu[i].sex == 'm')
        {
            printf ("%s\t%c\t", pstu[i].name, pstu[i].sex);
            for (j = 0; j < 4; j++)
            {
                printf ("%f\t", pstu[i].score[j]);
            }
            printf ("\n");
        }
    }
}
我给写好了，你写的程序里边compare根本在这里边没什么作用，不知道你写了这个干什么，我给改好了，我的这个完全可以运行。