实验四

#include <stdio.h>
#include <stdlib.h>
#define N 10
typedef struct student {
    int num;
    char name[20];
    int score;
}STU;
int main()
{
    FILE *fin;
    STU st[N];
    int i;
    fin = fopen("file4.dat", "r");
    if(!fin)
    {
        printf("fail to open file1.dat\n");
        exit(0);
    }
    for(i=0; i<N; i++)
    fread(st,sizeof(STU),10,fin);
    printf("%-6d%-10s%3d\n", st[i].num, st[i].name, st[i].score);
    fclose(fin);
    return 0;
}

实验五

#include <stdio.h>
#include <string.h>
const int N = 10;
typedef struct student {
    long int id;
    char name[20];
    float objective;    
    float subjective;    
    float sum;
    char level[10];    
}STU; 

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;
} 

void input(STU s[], int n) {
    FILE *fin;
    fin = fopen("examinee.txt", "r");
    int i;
    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);
}

void output(STU s[], int n) {
    FILE *fout;
    fout = fopen ("result.txt","w");
    int i;
    for (i=0;i<n;i++){
        printf("%ld  %8s  %f  %f  %f  %s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level);
        fprintf(fout,"%ld  %8s  %f  %f  %f  %s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level);
    }
    fclose(fout);
}

void process(STU s[], int n) {
    for (int i = 0; i < n; i++) {
        s[i].sum = s[i].objective + s[i].subjective;
        if (s[i].sum < 60) {
            strcpy(s[i].level, "不合格");
        }
        else if (s[i].sum < 80) {
            strcpy(s[i].level, "合格");
        }
        else {
            strcpy(s[i].level, "优秀");
        }
    }
    for (int i = 0; i < n - 1; i++) {
        STU temp ;
        for (int j = 0; j < n-1-i; j++) {
            if (s[j].sum < s[j + 1].sum) {
                temp = s[j];
                s[j] = s[j + 1];
                s[j + 1] = temp;
            }
        }
    }
}