实验7

四

#include<stdio.h>
#include<stdlib.h>
#define N 100
int main()
{
    int i=0,j,line=1,sum=0;
    char s[N];
    FILE *fp;
    fp=fopen("data4.txt","r");
    if(fp==NULL){
        printf("fail to open file to read\n");
        return;
    }
    while((s[i]=fgetc(fp))!=EOF)
        ++i;
    for(j=0;j<i;j++){
        if(s[j]=='\n')
            line++;
        if(s[j]!='\n'&&s[j]!=' '&&s[j]!='\t')
            sum++;
    }
    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",sum);
    fclose(fp);
    system("pause");
    return 0;
}

 

 

五

#include <stdio.h>
#include <string.h>
#include<stdlib.h>
#define N 10
typedef struct {
    long id;            // 准考证号
    char name[20];      // 姓名
    float objective;    // 客观题得分
    float subjective;   // 操作题得分
    float sum;          // 总分
    char result[10];    // 考试结果
} 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);   // 输出所有考生完整信息到屏幕
    write(stu, N);    // 输出考试通过的考生信息到文件

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

    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");
    if(fp==NULL){
        printf("fail to open file\n");
        return;
    }
    fprintf(fp,"准考证号\t姓名\t\t客观题得分\t\t操作题得分\t\t总分\t\t结果\n");
    for(i=0;i<n;i++){
        if(s[i].sum>=60){
            fprintf(fp,"%ld\t\t%s\t\t%.2lf\t\t%.2lf\t\t%.2lf\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 i,k=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[k++]=st[i];
        }
        else
            strcpy(st[i].result,"未通过");
    }
        return k;
}

 

 

六

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<string.h>
#include<stdlib.h>
#define N 100
#define M 5
int main(){
    char s[N][N],hit[M][N];
    FILE *fin,*fout;
    int i,n,lucky_i;
    int has_hit[N]={0};
    char filename[N];
    fin=fopen("list.txt","r");
    if(!fin){
        printf("fail to open file");
        return 1;
    }

    i=0;
    while(fgets(s[i],N,fin)!=NULL)
        ++i;
    n=i;
    srand(time(0));
    for(i=0;i<M;){
        lucky_i=rand()%n;

        if(has_hit[lucky_i])
            continue;
        has_hit[lucky_i]=1;
        strcpy(hit[i],s[lucky_i]);
        ++i;
    }
    printf("-----中奖名单-----\n");
    for(i=0;i<M;++i)
        printf("%s",hit[i]);
    printf("\n-----保存到文件-----\n");
    printf("输入文件名:");
    gets(filename);
    fout=fopen(filename,"w");
    if(!fout){
        printf("fail to open file");
        return 1;
    }
    else
        printf("保存成功！");

    for(i=0;i<M;++i){
        fprintf(fout,"%s",hit[i]);
    }
    fclose(fin);
    fclose(fout);
    system("pause");
    return 0;
}