实验七

实验3:是,是,是

实验4:是,是,否

#include <stdio.h> 
#include <stdlib.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", "rb");
    if( !fin ) { 
        printf("fail to open file1.dat\n");
        exit(0);
    }
    fread(st, sizeof(STU), N,fin); 
    fclose(fin);
    for(i=0; i<N; i++) 
        printf("%-6d%-10s%3d\n", st[i].num, st[i].name, st[i].score);
    return 0;
}

#include <stdio.h>
#include <string.h>
#include<stdlib.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); 
    
    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) {
    FILE *fin;
    int i;
    fin = fopen("examinee.txt", "r");
    if(!fin) {
        printf("fail to open examinee.txt\n");
        exit(0);
    }    
    for(i=0; i<N; i++) 
        fscanf(fin,"%ld %s %f %f",&s[i].id,&s[i].name,&s[i].objective,&s[i].subjective);    
    fclose(fin);
}

// 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) {
    FILE *fout;
    int i;
    fout = fopen("result.txt", "w");
    if( !fout ) {  
        printf("fail to open result.txt\n");
        exit(0);
    }
    fprintf(fout,"\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");
    for(i=0; i<N; i++) {
        printf("%ld %10s %8.2f %10.2f %10.2f %10s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level);
        fprintf(fout,"%ld %10s %8.2f %10.2f %10.2f %10s\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) {
    int i,a,b,j;
    STU c;
    for(i=0;i<n;i++){
        s[i].sum=0.4*s[i].objective+0.6*s[i].subjective;
    }    
    for(a=0;a<n-1;a++){
        for(b=0;b<n-a-1;b++){
            if(s[b].sum<s[b+1].sum){
                c=s[b+1];
                s[b+1]=s[b];
                s[b]=c;
            }
        }                
    }
        for(j=0;j<n;j++){
            if(j==0)
                strcpy(s[j].level,"优秀");                        
            else if(j>0&&j<=4)
                strcpy(s[j].level,"合格");                        
            else
                strcpy(s[j].level,"不合格");                        
        }    
}

posted @ 2020-12-30 18:52  樱花凌空而逝  阅读(75)  评论(2编辑  收藏  举报