实验7

实验7

task_4代码

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

int line(FILE* fp);
int number(FILE* fp);
 
int main()
{
	int linex, num;
	FILE* fp;
	fp = fopen("data4.txt", "r");
	if (!fp) {
		printf("fail to open file to read\n");
		return -1;
	}
	linex = line(fp);
	num = number(fp);
	fclose(fp);
	printf("data4.txt统计结果：\n行数：                %-5d\n字符数(不计空白符)：%-5d", linex, num);
	
	system("pause");

	return 0;
}
 
int line(FILE* fp) {
	int count = 0;
	rewind(fp);
	while (!feof(fp)) {
		if (fgetc(fp) == '\n')
			count++;
	}
	count += 1;
	return count;
}
int number(FILE* fp) {
	int count = 0;
	char flag;
	rewind(fp);
	while (!feof(fp)) {
		flag = fgetc(fp);
		if ( flag!= '\n' && flag != ' ' && flag != '\t'&& flag != EOF)
			count++;
	}
	return count;
}
 

运行结果

task_5代码

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

	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;
    }

    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);
}

void write(STU s[], int n) 
{
    FILE *fout;
    int i;
    fout = fopen("list_pass.txt", "w");
    if (!fout) 
    {
        printf("fail to open 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++)
    {
        if (s[i].sum >= 60) 
        { 
            fprintf(fout, "%ld\t%s\t%.2f\t%.2f\t%.2f\t%s\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_count = 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_count] = st[i];
            pass_count++;
        } else 
        {
            strcpy(st[i].result,"不通过");
        }
    }
    return pass_count; 
}

运行结果

task_6代码

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 80
int main(){
    char info[N][80];
    int flag[N]={0};
    int i;
    int lucky_index;
    int win[N];
    char filename[N];
    FILE *fp;

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

    for(i=0;i<N;i++)
    fgets(info[i],80,fp);
    fclose(fp);

    srand(time(NULL));
    printf("------中奖名单------\n");
    for(i=0;i<5;i++){
    lucky_index=rand()%N;
    while(flag[lucky_index])
        lucky_index=rand()%N;
    flag[lucky_index]=1;
    printf("%s",info[lucky_index]);
    win[i]=lucky_index;
    }
    printf("------保存到文件------\n");
    printf("输入文件名：");
    scanf("%s",filename);
    fp = fopen(filename, "w");
    if(!fp) {
        printf("fail to open file to write\n");
        return;
    }
    for(i=0;i<5;i++){
        fputs(info[win[i]],fp);
        fputs("\n",fp);
    }
    fclose(fp);
    printf("保存成功\n");
    system("pause");
    return 0;
}

运行结果