实验7

task4

程序

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

int main(){
    FILE *fp;
    int s1=0,s2=0;
    char c;
    fp=fopen("data4.txt","r");

    while(!feof(fp)){
        c=fgetc(fp);
        if(c=='\n')
            s1++;
        if((c>='a' && c<='z')||(c>='A' && c<='Z')||(c>='0' && c<='9')||c=='-')
            s2++;
    }
    printf("data4.txt统计结果：\n行数：\t\t\t%d\n字符数(不计空白字符)：\t%d\n",s1+1,s2);
    fclose(fp);
    system("pause");
    return 0;
}

运行结果

 

task5

程序

#include <stdio.h>
#include <string.h>
#include<stdlib.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);
    system("pause");
    return 0;
}

// 把所有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].result);
}

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

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

    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 write(STU s[], int n) {
    FILE *fout;
    int i;

    fout = fopen("list_pass.txt", "w");
    if (!fout) {
        printf("fail to create file\n");
        return;
    }

    fprintf(fout, "准考证号\t姓名\t客观题得分\t操作题得分\t总分\t结果\n");
    for (i = 0; i < n; i++) {
        fprintf(fout, "%-10d%-10s%-15.2f%-15.2f%-15.2f%-10s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
    }
    fclose(fout);
}

int process(STU st[], int n, STU st_pass[]) {
    int i, pass_cnt = 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[pass_cnt] = st[i]; \
            pass_cnt++;
        } 
        else {
            strcpy(st[i].result, "不通过");
        }
    }
    return pass_cnt;
}

运行结果

 

task6

程序

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 80

typedef struct{
    int id;
    char name[N];
    char c[N];
}Student;

void random(Student x1[],Student x2[],int n);
void output(Student x[],int n);
void read(Student x[],int n);
void write(Student x[],int n,char f[]);

int main(){
    Student stu[N],luck[N];
    char f[N];
    read(stu,N);
    random(stu,luck,N);
    printf("-----------中奖名单------------\n");
    output(luck,5);
    printf("-----------保存到文件----------\n");
    printf("输入文件名：");
    scanf("%s",&f);
    write(stu,5,f);
    system("pause");
}

void read(Student x[],int n)
{
    FILE *fin;
    int i;
    fin=fopen("list.txt","r");
    while(!feof(fin)){
        for(i=0;i<n;i++)
            fscanf(fin,"%d %s %s",&x[i].id,x[i].name,x[i].c);}
    fclose(fin);
}
void random(Student x1[],Student x2[],int n)
{
    int m,i;
    srand(time(NULL));
    for(i=0;i<5;i++){
        m=rand()%(n-1+1);
        x2[i]=x1[m];}
}
void output(Student x[],int n)
{
    int i;
    for(i=0;i<n;i++)
        printf("%-15d%-10s%-30s\n",x[i].id,x[i].name,x[i].c);
}
void write(Student x[],int n,char f[])
{
    FILE *fp;
    int i;
    fp=fopen(f,"w");
    for(i=0;i<n;i++)
        fprintf(fp,"%-15d%-10s%-30s\n",x[i].id,x[i].name,x[i].c);
    fclose(fp);
    printf("保存成功！\n");
}

运行结果