实验7

实验任务4

源代码

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main(){
    FILE *fp;
    char ch;
    int line=0;
    int char_count=0;
    fp=fopen("C:\\Users\\Lenovo\\Desktop\\实验7数据文件及部分代码_gbk\\data4.txt","r");
    if(!fp){
       perror("data4.txt");
       return 1;
    }
    while((ch=fgetc(fp))!=EOF){
        if(ch=='\n'){
            line++;
        }
        if(ch!=' '&&ch!='\n'&&ch!='\t'){
            char_count++;
        }
    }
    if(char_count>0){
            line++;
    }
    fclose(fp);
    printf("data4.txt统计结果：\n");
    printf("行数：\t\t\t%d\n",line);
    printf("字符数（不计空白符）：  %d\n",char_count);
    
    return 0;
}

运行结果截图

实验任务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...\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("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) {
    int i;
    FILE *fp;
    fp=fopen("list_pass.txt","w");
    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++){
        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 cnt=0,i;
    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[cnt++]=st[i];
        }else {
            strcpy(st[i].result,"不通过"); 
        }
    }
    return cnt;
}

运行结果截图

实验任务6

源代码

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define N 100

int main(){
    srand((unsigned int)time(NULL));
    char s[N][N];
    char st[N][N];
    int i,n,a;
    FILE *fp;
    fp=fopen("C:\\Users\\Lenovo\\Desktop\\实验7数据文件及部分代码_gbk\\list.txt","r");
    if(!fp){
       perror("list.txt");
       return 1;
    }
    
    i=0;
    while(fgets(s[i],N,fp)!=NULL)
         ++i;
    n=i;
    for(i=0;i<n;i++){
       fgets(s[i],N,fp);
       printf("%s",s[i]);
    }
    printf("---------中奖名单-----------\n");
    for(i=0;i<5;i++){
        a=rand()%n;
        strcpy(st[i],s[a]);
    }
    for(i=0;i<5;i++){
        printf("%s",st[i]);
    }
    printf("----------保存到文件----------\n");
    time_t now=time(NULL);
    char b[50];
    struct tm*local=localtime(&now);
    strftime(b,sizeof(b),"%Y%m%d.txt",local);
    fp=fopen(b,"w");
    if(!fp){
        perror("保存文件失败");
        return 1;
    }
    for(i=0;i<5;i++){
        fprintf(fp,"%s\n",st[i]);
        
    } 
    fclose(fp);
    printf("输入文件名：%s\n",b);
    printf("保存成功！"); 
    
    return 0;
}

运行结果截图