实验7

task4

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

int main() {
    FILE* fp;

    int i = 0;
    fp = fopen("C:\\ly\\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;
}

task5

#include<stdio.h>
#include<string.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通过考试名单：\n");
    output(stu, N);
    write(stu, N);
    pass_rate = 1.0 * cnt / N;
    printf("\n本次考试通过率：%.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:\\ly\\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);
}
int process(STU st[], int n, STU st_pass[]) {
    int i;
    int k=0;
    for (i = 0; i < n; i++) {
        st[i].sum = st[i].subjective + st[i].objective;
        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;
}
void write(STU st[], int n) {
    FILE* fp;
    int i;
    fp = fopen("C:\\ly\\list_pass.txt", "w");
    if (!fp) {
        perror("list_pass.txt");
        return 1;
    }
    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 (i = 0; i < n; i++) {
        if (st[i].sum >= 60)
            fprintf(fp, "%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);
    }
    fclose(fp);
}

task6

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<string.h>
#define N 100
int main()
{
    char s[N][N],signal[N]={0};
    int i,k, n=80, num;
    char name[100],luckydog[5][100];
    FILE* fp;
    FILE* fp1;
    fp = fopen("C:\\Users\\wenov\\Desktop\\task6\\list.txt","r+");
    if (!fp) {
        perror("list.txt");
        return 1;
    }
    for (i = 0; i < n; i++)
    {
        fgets(s[i], N, fp);
    }
    srand((unsigned)time(NULL));
    printf("------中奖名单------\n");
    for (k = 0; k < 5; k++)
    {
        num = rand() % 80 + 1;
        if(signal[num]==0)
        {
            signal[num]=1;
            strcpy(luckydog[k],s[num]);
            printf("%s", s[num]);
        }
        else
        {
            k--;
        }
    }
    printf("--------保存到文件-------\n");
    printf("输入文件名：");
    gets(name);
    fp1=fopen(name,"w+");
    for(k=0;k<5;k++)
    {
        fprintf(fp1,"%s",luckydog[k]);
    }
    printf("保存成功！");
    fclose(fp);
    return 0;
}