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实验7

时间:2023-12-20 18:11:06浏览次数:31  
标签:int pass st ++ 实验 printf include



#define _CRT_SECURE_NO_WARNINGS #include<stdio.h> #include<stdlib.h> #include <stdio.h> #include <string.h> #define N 100 #define M 100 int main() { FILE* fp; fp = fopen("data4.txt", "r"); if (fp == NULL) { printf("无法打开文件\n"); return 1; } int count = 0; char b; while ((b = fgetc(fp)) != EOF) if (b != ' ' && b != '\n') count++; printf("文件内字符数为%d\n", count); fclose(fp); return 0; }

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

#define N 10

typedef struct {
    long int id;
    char name[20];
    float objective;    // 客观题得分
    float subjective;   // 操作题得分
    float sum;          // 总分
    char ans[10];       // 考试结果
} STU;

// 函数声明
void finput(STU st[], int n);
void foutput(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);
    finput(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);      // 输出到屏幕
    foutput(stu, N);    // 输出到文件

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

    return 0;
}

// 把通过考试的考生完整信息输出到屏幕上
// 准考证号,姓名,客观题得分,操作题得分,总分,结果
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].ans);
}

// 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 finput(STU st[], int n) {
    int i;
    FILE* fin;

    fin = fopen("examinee.txt", "r");
    if (fin == NULL) {
        printf("fail to open file\n");
        exit(0);
    }

    while (!feof(fin)) {
        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);
}

// 把通过考试的考生完整信息写入文件list_pass.txt
// 准考证号,姓名,客观题得分,操作题得分,总分,结果
void foutput(STU s[], int n) {
    FILE* fout;
    int i;

    // 保存到文件 
    fout = fopen("list_pass.txt", "w");
    if (!fout) {
        printf("fail to open or create list_pass.txt\n");
        exit(0);
    }

    fprintf(fout, "准考证号\t\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++)
        fprintf(fout, "%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].ans);

    fclose(fout);
}



// 对考生信息进行处理:计算每位考生考试总分、结果;统计考试通过的人数
int process(STU st[], int n, STU st_pass[]) {
    int i = 0;
    int count = 0;
    for (i = 0; i < n; i++)
    {
        st[i].sum = st[i].objective + st[i].subjective;
        if (st[i].sum >= 60) {
            strcpy(st[i].ans, "pass");
            st_pass[count++] = st[i];
        }
        else
            strcpy(st[i].ans, "fail");
    }
    return count;
   
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
    FILE* fp;
    fp = fopen("list.txt", "r");
    if (fp == NULL)
    {
        printf("无法打开文件");
        exit(0);
    }
    int i;
    char a[80][100];
    for (i = 0; i < 80; i++)
    {
        fgets(a[i], 100, fp);
    }
    FILE* fp2;
    fp2 = fopen("lucky.txt", "w");
    if (fp2 == NULL)
    {
        printf("failed");
        exit(0);
    }
    srand(time(NULL));
    for (i = 0; i < 5; i++)
    {
        int t = 0;
        t = rand() % 81;
        fprintf(fp2, "%s", a[t]);
        printf("%s", a[t]);
    }
    return 0;
}

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<string.h>
int main()
{
    FILE* fp1,*fp2;
    fp1 = fopen("list.txt", "r");
    if (fp1 == NULL)
    {
        printf("failed");
        exit(0);
    }
    int i;
    char a[80][100];
    for (i = 0; i < 80; i++)
    {
        fgets(a[i], 100, fp1);
    }
    char Time[20];
    time_t timer;
    timer = time(NULL);
    strftime(Time, 20, "%Y.%m.%d", localtime(&timer));
    fp2 = fopen(Time, "w");//开只写文件
    if (fp2 == NULL)
    {
        printf("failed");
        exit(0);
    }
    char b[5][100];
    srand((double)time(NULL));
    for (i = 0; i < 5;)
    {
        int t = 0;
        t = rand() % 81;
        if (strcmp(a[t], " "))
        {
            strcpy(b[i], a[t]);
            strcpy(a[t], " ");
            i++;
        }
    }
    int j;
    for (i = 0; i < 5 - 1; i++)
    {
        for (j = 0; j < 5- i - 1; j++)
        {
            if (strcmp(b[j], b[j + 1]) > 0)
            {
                char c[100];
                strcpy(c, b[j]);
                strcpy(b[j], b[j + 1]);
                strcpy(b[j + 1], c);
            }
        }
    }
    for (i = 0; i < 5; i++)
    {
        fprintf(fp2, "%s", b[i]);
        puts(b[i]);
    }
    return 0;
}

 

标签:int,pass,st,++,实验,printf,include
From: https://www.cnblogs.com/WZX1521105313/p/17917182.html

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