C语言实现学生成绩信息的读取和处理

功能

读取文件中关于学生姓名、专业、成绩等信息，计算其总成绩和各专业的学生数、平均成绩，并输出。

效果

读取文件：

小红 通信 84 88 84
小明 通信 77 65 58
张三 通信 89 93 95
李四 软件 88 91 94
钱五 软件 95 49 98
王五 网络 71 94 88
大明 网络 45 54 45

程序运行结果：

源代码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
#define IsCommu(x) (strcmp((x)->major, "通信") == 0) //利用宏判断专业类型
#define IsNet(x) (strcmp((x)->major, "网络") == 0)
#define IsSoft(x) (strcmp((x)->major, "软件") == 0)

struct student //存放学生数据的结构体
{
    char name[100];
    char major[100];
    int eng;
    int alg;
    int c;
    int sum;
} *p = NULL;

struct calc //存放专业统计数据的结构体
{
    char major[100];
    int snum;
    int avg;
} Commu = {"通信", 0, 0}, Net = {"网络", 0, 0}, Soft = {"软件", 0, 0};

int ReadStudentInfo(const char *filename) //打开文件，读取数据
{
    int sum = 0, i;
    char name[100];
    char major[100];
    int eng;
    int alg;
    int c;
    FILE *fp;
    int num = 0;
    struct student *p1 = NULL;
    fp = fopen(filename, "rt");
    if (fp == NULL)
        return -1;
    while (1) //统计学生数量
    {
        if (fscanf(fp, "%s%s%d%d%d", name, major, &eng, &alg, &c, &sum) < 5)
            break;
        num++;
    }
    if (num < 1)
    {
        fclose(fp);
        return num;
    }
    p1 = (struct student *)malloc(sizeof(struct student) * num); //开辟动态存储空间，存放数据
    p = p1;
    fseek(fp, 0, SEEK_SET);
    while (1)
    {
        if (fscanf(fp, "%s%s%d%d%d", name, major, &eng, &alg, &c, &sum) < 5)
            break;
        strcpy(p1->name, name);
        strcpy(p1->major, major);
        p1->eng = eng;
        p1->alg = alg;
        p1->c = c;
        p1++;
    }
    fclose(fp);
    return num;
}

void Count(int num) //计算学生总成绩，计算各专业学生人数和平均分
{
    int i, csum = 0, nsum = 0, wsum = 0;
    for (i = 0; i < num; i++)
    {
        (p + i)->sum = ((p + i)->eng + (p + i)->alg + (p + i)->c);
    }
    for (i = 0; i < num; i++)
    {
        if (IsCommu(p + i))
        {
            Commu.snum++;
            csum += (p + i)->sum;
        }
        if (IsNet(p + i))
        {
            Net.snum++;
            nsum += (p + i)->sum;
        }
        if (IsSoft(p + i))
        {
            Soft.snum++;
            wsum += (p + i)->sum;
        }
    }
    Commu.avg = (csum / Commu.snum);
    Net.avg = (nsum / Net.snum);
    Soft.avg = (wsum / Soft.snum);
}

void print(int num) //显示结果
{
    int i;
    printf("学生信息：\n-----------------------------------------------------\n");
    printf(" 序号 | 姓　名 | 专业名称 | 英语成绩 | 代数成绩 | C语言成绩 | 总成绩\n");
    for (i = 1; i <= num; i++)
    {
        printf("%5d %8s %10s %10d %10d %11d %7d\n", i, p->name, p->major, p->eng, p->alg, p->c, p->sum);
        p++;
    }
    printf("\n统计信息：\n-----------------------------------------------------\n");
    printf(" 序号 专业名称 学生人数 平均成绩\n");
    printf("    1 %8s %8d %8d\n", Commu.major, Commu.snum, Commu.avg);
    printf("    2 %8s %8d %8d\n", Net.major, Net.snum, Net.avg);
    printf("    3 %8s %8d %8d\n", Soft.major, Soft.snum, Soft.avg);
}

int main()
{
    int num;
    struct student *p = NULL;
    char file[100];
    printf("请输入文件路径\n");
    gets(file);
    num = ReadStudentInfo(file);
    if (num < 1)
    {
        printf("读取信息失败！\n");
        system("pause");
        return -1;
    }
    Count(num);
    print(num);
    system("pause");
    return 0;
}