实验7

任务6

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

#include<time.h>
#define N 100
int main() {
    char s[N][N];
    FILE *fin;
    FILE* fp;
    char name[80];
    gets(name);
    int i = 0, n;
    fp = fopen("C:\\Users\\空白\\Desktop\\C语言\\实验7数据文件及部分代码_gbk\\list.txt", "r");
    fin = fopen(name, "w");
    if (!fp) {
        perror("文件打开失败");
        return 3;
    }
    if (!fin) {
        perror("文件打开失败");
        return 2;
    }

    while (fgets(s[i], N, fp) != NULL) 

        i++;
    n = i;

    int ab[N] = { 0 };
    int m = 0;
    srand(time(NULL));
    
    for (i = 0; i <5; i++) {
        m = rand() % n;
    
        if (ab[m] == 0) {
            printf("%s", s[m]);
            ab[m] = 1;
            fprintf(fin, "%s", s[m]);
        }
        else
            i--;
    }
    fclose(fp);
    fclose(fin);
    return 0;
}

 

任务5

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

#define N 10

typedef struct {
    long id;            
    char name[20];      
    float objective;    
    float subjective;   
    float sum;          
    char result[10];    
} STU;

void read(STU st[], int n);
void write(STU st[], int n);
void output(STU st[], int n);
int process(STU st[], int n, STU st_pass[]);

int main() {
    STU stu[N], stu_pass[N];
    int cnt;
    double pass_rate;

    printf("从文件读入%d个考生信息...\n", N);
    read(stu, N);

    printf("\n对考生成绩进行统计...\n");
    cnt = process(stu, N, stu_pass);

    printf("\n通过考试的名单:\n");
    output(stu, N);   
    write(stu, N);    

    pass_rate = 1.0 * cnt / N;
    printf("\n本次等级考试通过率: %.2f%%\n", pass_rate * 100);

    return 0;
}

void output(STU st[], int n) {
    int i;

    printf("准考证号\t姓名\t客观题得分\t操作题得分\t总分\t\t结果\n");
    for (i = 0; i < n; i++)
        printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);
}
void read(STU st[], int n) {
    int i;
    FILE* fin;

    fin = fopen("C:\\Users\\空白\\Desktop\\C语言\\实验7数据文件及部分代码_gbk\\examinee.txt", "r");
    if (!fin) {
        printf("fail to open file\n");
        return;
    }

    for (i = 0; i < n; i++)
        fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);

    fclose(fin);
}


void write(STU s[], int n) {
    FILE* fp;
    fp = fopen("ning.txt", "w");
    if (!fp) {
        printf("fail to open file\n");
        return;
    }
    fprintf(fp,"准考证号\t姓名\t客观题得分\t操作题得分\t总分\t\t结果\n");
    for (int i = 0; i < n; i++) {
        if (strcmp(s[i].result, "通过") == 0)
            fprintf(fp, "%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
    }
    fclose(fp);
}

int process(STU st[], int n, STU st_pass[]) {
    int k = 0;
    for (int i = 0; i < n; i++) {
        st[i].sum = st[i].objective + st[i].subjective;
        if (st[i].sum >= 60) {
            strcpy(st[i].result, "通过");
            st_pass[k++] = st[i];
        }
        else 
            strcpy(st[i].result, "不通过");
    }
    return k;
}

 

 

通过率漏接了；

实验4

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

int main() {
    FILE* fp;
    
    int i = 0;
    fp = fopen("C:\\Users\\空白\\Desktop\\C语言\\实验7数据文件及部分代码_gbk\\data4.txt", "r");
    
    if (!fp) {
        perror("文件打开失败");
        return 3;

    }
    int k = 0;
    
    char ch;
    while ((ch = fgetc(fp)) != EOF) {
        if (ch == '\n')
            i++;
        if(ch!=' '&&ch!='\n'&&ch!='\t')
            k++;
    }
    if (k > 0 && ch != '\n')
        i++;
    printf("data4.txt统计结果\n");
    printf("行数:%d\n", i);
    printf("字符数%d\n", k);
    fclose(fp);
    return 0;
}