实验7作业

任务4

#include<stdio.h>
int main()
{
	FILE *fp;
	int line=1,num=0;
	char ch;
	fp=fopen("C:\\Users\\LKX\\Downloads\\实验7数据文件及部分代码_gbk\\实验7数据文件及部分代码_gbk\\data4.txt","r");
	if(fp==NULL)
	{
		perror("data4.txt");
		return 1;
	}
	while((ch=fgetc(fp))!=EOF) 
	{
		
		if(ch=='\n')
			line++;
		if(ch!=' '&&ch!='\t'&&ch!='\n')
		    num++;
	}
	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",num); 
	
	
	return 0;
}

  

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 任务5

#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) 
{
    FILE *fin;
    int i;
    fin=fopen("list_pass","w");
    if(!fin)
    	perror("list_pass");
    fprintf(fin,"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(fin,"%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); 
}


int process(STU st[], int n, STU st_pass[]) 
{
	int i,num=0,k=0;
	for(i=0;i<n;i++)
	{
		st[i].sum=st[i].objective+st[i].subjective;
		if(st[i].sum>=60)
		{
			num++;
			strcpy(st[i].result,"通过");
			st_pass[k++]=st[i];
		}
		else
			strcpy(st[i].result,"不通过");	
	}	
    return num;
}
   	

  

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任务6

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h> 
#define N 100
#define M 5

int main()
{
	int i,n,lucky_i;
	char s[N][N];
	char hit[N][N];
	int has_hit[N]={0};
	FILE *fin,*fout;
	char filename[80];
	
	fin=fopen("C:\\Users\\LKX\\Downloads\\实验7数据文件及部分代码_gbk\\实验7数据文件及部分代码_gbk\\list.txt","r");
	
	if(!fin)
	{
		perror("list.txt");
		return 1;
	}
	i=0;
	while(fgets(s[i],N,fin)!=NULL)
		++i;	
	n=i;
	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;		
	}
	
	for(i=0;i<M;i++)
		printf("%s\n",hit[i]);
		
	printf("Enter filename:");
	gets(filename);
	fout=fopen(filename,"w");
	if(!fout)
	{
		perror("filename");
		return 1;
		
	}
	for(i=0;i<M;i++)
		fprintf(fout,"%s",hit[i]);
	
	fclose(fin);
	fclose(fout);
	
	return 0;
}

  

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posted @ 2025-12-27 22:11  鸋y  阅读(2)  评论(0)    收藏  举报