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第七次实验

时间:2023-12-20 13:23:13浏览次数:23  
标签:fp int pass st STU 实验 第七次 printf

task4

#include<stdio.h>
int main()
{
	char ch;
	FILE *fp;
	fp = fopen("data4.txt","r");
	int count = 0;
	while(1)
	{
		ch = fgetc(fp);
		if(ch==EOF)
		break;
		if(ch==' '||ch=='\n')
		continue;	
		else
		count++;	
	}
	printf("%d\n",count);
	return 0;
} 

  

task5

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

#define N 10

typedef struct {
    long int id;
    char name[20];
    float objective;    // 客观题得分
    float subjective;   // 操作题得分
    float sum;          // 总分
    char ans[10];       // 考试结果
} STU;

// 函数声明
void finput(STU st[], int n);
void foutput(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);
    finput(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);      // 输出到屏幕
    foutput(stu, N);    // 输出到文件

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

    return 0;
}

// 把通过考试的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].ans);
}

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

    fin = fopen("examinee.txt", "r");
    if (fin == NULL) {
        printf("fail to open file\n");
        exit(0);
    }

    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 foutput(STU s[], int n) {
    FILE *fout;
    int i;
    
    // 保存到文件 
    fout = fopen("list_pass.txt", "w");
    if (!fout) {
        printf("fail to open or create list_pass.txt\n");
        exit(0);
    }
    
    fprintf(fout, "准考证号\t\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(fout, "%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].ans);

    fclose(fout);
}



// 对考生信息进行处理:计算每位考生考试总分、结果;统计考试通过的人数
int process(STU st[], int n, STU st_pass[]) {
   int i;
   int k = 0;
   int count = 0;
   for(i=0;i<n;i++) 
   {
   		st[i].sum = st[i].objective+st[i].subjective;
   	
   		if(st[i].sum>=60)
   		{
   			st_pass[k++] = st[i];
   			strcpy(st[i].ans,"pass");
		}
		else
			strcpy(st[i].ans,"fail");
   }
   
   return k; 
}

  

task6-1

#include<stdio.h>
#include<stdlib.h>
#define N 5
#define M 10
#define H 50
#define NM 10000

typedef struct
{
	char number[M];//学号 
	char name[M];//姓名 
	char clas_now[H];//班级 
}STU;

int main()
{
	int k;
	int i = 0;
	int j;
	STU st[NM];
	FILE *fp;
	
	fp = fopen("list.txt","r");
	
	if(fp==NULL)
	{
		printf("fail to open file\n");
		return 1; 
	}
	while(!feof(fp))
	{
		fscanf(fp,"%s%s%s",st[i].number,st[i].name,st[i].clas_now);
		++i;
	}
	
	for(k=0;k<5;k++)
	{
		j = rand()%(i-1);
		printf("%-20s%-20s%-20s\n",st[j].number,st[j].name,st[j].clas_now);
	}
	fclose(fp);
	return 0;
}

  

6-2选做

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

typedef struct
{
	char number[N];						//学号 
	char name[N];						//姓名 
	char clas_now[N];					//班级	
}STU;

int main()
{
	int n;               				//用于记录成员个数 
	STU st[N];           				//学生信息 
	char date[20] = {0}; 				//日期 
	int x[M];            				//下标 
	int a[N] = {0};      				//用以标记判断 
	int i = 0;
	int j;
	int tmp;            				//作为交换的介质 
	int m = 0;
	
	FILE*fp;							//从文件中读出 
	fp = fopen("list.txt","r");
	if(fp==NULL)
	{
		printf("fail to open the file\n");
		exit(0);
	}
	
	while(!feof(fp))
	{
		fscanf(fp,"%s%s%s",st[i].number,st[i].name,st[i].clas_now);
		i++;
	}
	
	n = i-1;
	fclose(fp);      			
	srand(time(NULL));
	while(1)             				//生成随机数 
	{
		j = rand()%n;
		if(a[j]!=1)
		{
			x[m] = j;
			m++;
			a[j] = 1;
		}
		if(m==M)
		break;
	}	
	
	
	for(i=0;i<M-1;i++)					//进行排序 
	{
		for(j=0;j<M-1-i;j++)
		{
			if(st[x[j]].number>st[x[j+1]].number)
			{
				tmp = x[j];
				x[j] = x[j+1];
				x[j+1] = tmp;	
			}
		}
	}

	
	time_t t;
	time(&t);
	strftime(date,sizeof(date),"%Y%m%d.txt",localtime(&t));
	 
	FILE*fpp;
	fpp = fopen(date,"w");

	if(fpp==NULL)
	{
		printf("fail to open the file\n");
		exit(0);	
	}
	
	for(i=0;i<M;i++)
	{
		fprintf(fpp,"%-20s%-20s%-20s\n",st[x[i]].number,st[x[i]].name,st[x[i]].clas_now);
	}
	
	fclose(fpp);
	
	for(i=0;i<M;i++)
	{
		printf("%-20s%-20s%-20s\n",st[x[i]].number,st[x[i]].name,st[x[i]].clas_now);
	}
	return 0;
	 
}

  

 

标签:fp,int,pass,st,STU,实验,第七次,printf
From: https://www.cnblogs.com/hychychyc/p/17916297.html

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