实验七

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

#define N 10

typedef struct student {
    int num;
    char name[20];
    int score;
}STU;

int main() {
    STU st, stmax, stmin;
    int i;
    FILE *fp;
    
    fp = fopen("file1.dat", "r");
    if( !fp ) {  
        printf("fail to open file1.dat\n");
        exit(0);
    }
    
    stmax.score = 0;    
    stmin.score = 100;
    
    while( !feof(fp) ) {
        fscanf(fp, "%d %s %d", &st.num, st.name, &st.score); 
        
        if(st.score > stmax.score)
            stmax = st;
        else if(st.score < stmin.score)
            stmin = st; 
    } 
    
    fclose(fp);
    
    printf("最高分学生信息: %5d%15s%5d\n", stmax.num, stmax.name, stmax.score);
    printf("最低分学生信息: %5d%15s%5d\n", stmin.num, stmin.name, stmin.score);

    system("pause");
    return 0;
}

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

#define N 10

typedef struct student{
    int num;
    char name[20];
    int score;
}STU;

int main()
{
    FILE *fin,*fout;
    STU st[N];
    int i;
    
    fin=fopen("file4.dat","wb");
    if(!fin)
    {
        printf("fail to open file4.dat\n");
        exit(0);
    }
    for(i=0;i<N;i++)
    if(fwrite(&st[i],sizeof(struct student),1,fin)!=1)
    printf("file write error\n");
        fclose(fin);
        
    fout=fopen("file4.dat","rb");
    if(!fin)
    {
        printf("fail to open file4.dat\n");
        exit(0);
    }
        
    for(i=0;i<N;i++)
    if(fread(&st[i],sizeof(struct student),1,fout)==1){
    printf("%d\t%s\t%d\n",st[i].num,st[i].name,st[i].score );
    }
    else{
        printf("file read error\n");
        break;
    }
    
    fclose(fout);

}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
const int N = 10;

// 定义结构体类型struct student，并定义其别名为STU 
typedef struct student {
    long int id;
    char name[20];
    float objective;    /*客观题得分*/
    float subjective;    /*操作题得分*/
    float sum;
    char level[10];    
}STU; 

// 函数声明
void input(STU s[], int n);
void output(STU s[], int n);
void process(STU s[], int n);

int main() {
    STU stu[N];
    
    printf("录入%d个考生信息: 准考证号，姓名，客观题得分(<=40)，操作题得分(<=60)\n", N); 
    input(stu, N);
    
    printf("\n对考生信息进行处理: 计算总分，确定等级\n");
    process(stu, N);
    
    printf("\n打印考生完整信息: 准考证号，姓名，客观题得分，操作题得分，总分，等级\n");
    output(stu, N); 
    
    system("pause");
    return 0;
} 

// 从文本文件examinee.txt读入考生信息:准考证号，姓名，客观题得分，操作题得分
void input(STU s[], int n) {
    // 补足代码
    // ××× 
    FILE *fp;
    int i;
    
    fp=fopen("examinee.txt","r");
    if(!fp)
    {
        printf("fail to open examinee.txt\n");
        exit(0);
    }
    for(i=0;i<N;i++)
        fscanf(fp,"%ld %s %f %f\n",&s[i].id,s[i].name,&s[i].objective,&s[i].subjective);
    
    fclose(fp);
}

// 输出考生完整信息: 准考证号，姓名，客观题得分，操作题得分，总分，等级
// 不仅输出到屏幕上，还写到文本文件result.txt中 
void output(STU s[], int n) {
    // 补足代码
    // ××× 
    FILE *fout;
    int i;
    
    fout=fopen("result.txt","w");
    if(!fout)
    {
        printf("fail to open result.txt\n");
        exit(0);
    }
    
    for(i=0;i<N;i++)
    {
        fprintf(fout,"%ld %8s %10lf %10lf %10lf %5s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level);
        printf("%ld %8s %10lf %10lf %10lf %5s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level);
    }
    fclose(fout);
}

// 对考生信息进行处理：计算总分，排序，确定等级
void process(STU s[], int n) {
    // 补足代码
    // ××× 
    int i,j;
    STU ch;
    for(i=0;i<N;i++)
    {
        s[i].sum=s[i].objective+s[i].subjective;
    }
    
    for(i=0;i<N-1;i++){
        for(j=0;j<N-1;j++)
        {
            if(s[j].sum<s[j+1].sum)
            {
            ch=s[j];
            s[j]=s[j+1];
            s[j+1]=ch;
            }
        }
}
    for(i=0;i<N;i++)
    {
        if((i+1)<=N*0.1)
        strcpy(s[i].level,"优秀");
        if((i+1)>N*0.1&&(i+1)<=N*0.5)
        strcpy(s[i].level,"合格");
        if((i+1)>N*0.5)
        strcpy(s[i].level,"不合格");
    }
}

void process(STU s[], int n) {
    // 补足代码
    // ××× 
    int i,j;
    float a,b;
    STU ch;
    a=N*0.1-1;
    b=N*0.5-1;
    for(i=0;i<N;i++)
    {
        s[i].sum=s[i].objective+s[i].subjective;
    }
    
    for(i=0;i<N-1;i++){
        for(j=0;j<N-1;j++)
        {
            if(s[j].sum<s[j+1].sum)
            {
            ch=s[j];
            s[j]=s[j+1];
            s[j+1]=ch;
            }
        }
}
    for(i=0;i<N;i++)
    {
        if(i=a)
        strcpy(s[i].level,"优秀");
        if(i>a&&i<=b)
        strcpy(s[i].level,"合格");
        if(i>b)
        strcpy(s[i].level,"不合格");
    }
}