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实验七

时间:2023-12-20 16:22:49浏览次数:26  
标签:int printf st STU 实验 pass t%

实验4

#include<stdio.h>
int main()
{
    char a;
    int count=0;
    FILE *fp;
    fp = fopen("data4.txt","r");
    if(fp==NULL) {
        printf("fail to open\n");
        return 1;
    }
    while(1)
    {
        a=fgetc(fp);
        if(a==EOF)
        break;
        if(a==' '||a=='\n'||a=='\t')
        count--;
        count++;

    }
    printf("data4.txt中共包含字符数(不计空白符):%d",count);
    fclose(fp);
    return 0;
}

实验5

#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[]) {
    FILE* fscore;
    int i,cnt = 0;
     fscore = fopen("list_pass.txt", "r");
     for ( i = 0; i < n; i++) {
         st[i].sum = st[i].objective + st[i].subjective;
     }
 
     for ( i = 0; i < n; i++) {
         if (st[i].sum >= 60) {
             strcpy(st[i].ans, "pass");
             cnt++;
         }
         else {
             strcpy(st[i].ans, "fail");
         }
     }
 
     return cnt;
}

实验6

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

typedef struct{
    long id;
    char name[20];
    char ban[40];
}xx;
int main()
{
    xx a[5],x[80];
    int i,n;
    FILE *fp,*fps;
    fp = fopen("list.txt","r");
    if(fp==NULL) {
        printf("fail to open\n");
        return 1;
    }
    srand((double)time(NULL));
    for(i=0;i<80;i++)
    fscanf(fp,"%ld%s%s",&x[i].id,x[i].name,x[i].ban);
    for(i=0;i<5;i++)
    {
    n=rand()%(204942080-204942001+1);
    a[i]=x[n];
    printf("%-20ld%-20s%-20s\n",a[i].id,a[i].name,a[i].ban);
    }
    fclose(fp);
    fps=fopen ("lucky.txt","w");
    if(fps==NULL)
    {
        printf("fail to open\n");
        return 1;
    }
    for(i=0;i<5;i++)
    fprintf(fps,"%-20ld%-20s%-20s\n",a[i].id,a[i].name,a[i].ban);
    fclose(fps);
    return 0;
}

 

标签:int,printf,st,STU,实验,pass,t%
From: https://www.cnblogs.com/757805abc/p/17916747.html

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