实验7

任务4

源代码

#include<stdio.h>

int main(){
    FILE *fp;
    char ch;
    int line=0,count=0;
    
    fp=fopen("data4.txt","r");
    if(fp==NULL){
        printf("文件打开失败!\n");
        return 1;
    }
    
    while ((ch=fgetc(fp))!=EOF){
        if(ch=='\n')
            line++;
        if(ch!=' '&&ch!='\t'&&ch!='\n')
            count++;            
    }
    line++; 
    fclose(fp);
    
    printf("data4.txt统计结果:\n");
    printf("行数:%d\n",line);
    printf("字符数(不计空白符):%d\n",count);
    
    return 0;
}

运行结果截图

任务5

源代码

#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: 已完成\n", N);
    read(stu, N);

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

    printf("\n所有考生完整信息:\n");
    output(stu, N);   

    printf("\n通过考试的名单写入文件: 已完成!\n");
    write(stu_pass, cnt);

    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("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,num=0;
    for(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[num]=st[i];
            num++;
        }else
                strcpy(st[i].result,"不通过");
    }
    return num;
}

void write(STU st[], int n) {
    int i;
    FILE *fout;
    fout=fopen("list_pass.txt","w");
    fprintf(fout,"准考证号\t姓名\t客观题\t操作题\t总分\t考试结果\n");
    for(i=0;i<n;i++)
        fprintf(fout,"%ld\t%s\t%.2f\t%.2f\t%.2f\t%s\n",st[i].id,st[i].name,st[i].objective,st[i].subjective,st[i].sum,st[i].result);
    fclose(fout);    
}

运行结果截图

任务6

源代码

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

typedef struct{
    char id[15];
    char name[15];
    char cls[25];
}Student;

int main(void)
{
    FILE *fp;
    Student stu[85];
    Student win[5];
    int flag[85]={0};
    int n=0,i,j,idx,temp;
    char filename[30];

    fp=fopen("list.txt","r");
    if(fp==NULL){
        printf("无法打开list.txt！\n");
        system("pause");
        return 1;
    }
    while(fscanf(fp,"%s %s %s",stu[n].id,stu[n].name,stu[n].cls)!=EOF){
        n++;
    }
    fclose(fp);
    srand((unsigned)time(NULL));
    for(i=0;i<5;i++){
        while(1){
            idx=rand()%n;
            if(flag[idx]==0){
                flag[idx]=1;
                win[i]=stu[idx];
                break;
            }
        }
    }

    for(i=0;i<4;i++){
        for(j=0;j<4-i;j++){
            if(strcmp(win[j].id,win[j+1].id)>0){
                Student t=win[j];
                win[j]=win[j+1];
                win[j+1]=t;
            }
        }
    }

    time_t now=time(NULL);
    struct tm *t=localtime(&now);
    strftime(filename,sizeof(filename),"%Y%m%d.txt",t);
    printf("---------%s中奖名单---------\n",filename);
    for(i=0;i<5;i++){
        printf("%s\t%s\t%s\n",win[i].id,win[i].name,win[i].cls);
    }

    fp=fopen(filename,"w");
    for(i=0;i<5;i++){
        fprintf(fp,"%s\t%s\t%s\n",win[i].id,win[i].name,win[i].cls);
    }
    fclose(fp);
    printf("----------------------------\n");
    printf("保存到文件：%s\n保存成功！\n",filename);

    system("pause");
    return 0;
}

运行结果截图