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实验六

时间:2022-12-27 20:44:29浏览次数:29  
标签:fp ch int char STU 实验 include

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(){
	FILE *fp;
	fp=fopen("data4.txt","r");
	
	char ch='a';
	int i=0;
	do
	{
		ch=fgetc(fp);
		if(ch!=' '&&ch!='\n'&&ch!='\t')
		i++;
	}while(!feof(fp));
	printf("%d",i-1);
	fclose(fp);
	return 0;
}

  

#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;
    char level[10];
} STU;

// 函数声明
void input(STU s[], int n);
void output(STU s[], int n);
void process(STU s[], int n);

int main() {
    STU stu[N];

    printf("从文件读入%d个考生信息: 准考证号,姓名,客观题得分(<=40),操作题得分(<=60)\n", N);
    input(stu, N);

    printf("\n对考生信息进行处理: 计算总分,确定等级\n");
    process(stu, N);

    printf("\n打印考生完整信息, 并保存到文件中");
    output(stu, N);

    return 0;
}

// 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 input(STU s[], 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", &s[i].id, s[i].name, &s[i].objective, &s[i].subjective);
    }

    fclose(fin);
}

// 输出考生完整信息: 准考证号,姓名,客观题得分,操作题得分,总分,等级
// 不仅输出到屏幕上,还写到文本文件result.txt中
void output(STU s[], int n) {
    FILE *fout;
    int i;
    
    // 输出到屏幕
	printf("\n");
    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等级\n");
    for (i = 0; i < n; i++)
    	printf("%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].level);
	
	// 保存到文件 
    fout = fopen("result.txt", "w");
    if (!fout) {
        printf("fail to open or create result.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等级\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].level);

    fclose(fout);
}

// 对考生信息进行处理:计算总分,排序,确定等级
void process(STU s[], int n) {
    int i;
    for(i=0;i<n;i++)
    s[i].sum=s[i].subjective+s[i].objective;
    
    int j;
    STU t;
    for(j=0;j<n-1;j++)
    for(i=0;i<n-1;i++)
    if(s[i].sum<s[i+1].sum)
    {
    	t=s[i+1];
    	s[i+1]=s[i];
    	s[i]=t;	
	}
	
	for(i=0;i<n;i++)
	if(1.0*i/10<=0.1)
	strcpy(s[i].level,"优秀");
	else if(1.0*i/10<=0.5)
	strcpy(s[i].level,"合格");
	else
	strcpy(s[i].level,"不合格");
	
}

  

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#define N 80
typedef struct{
long no;
char name[40];
char cla[40];
}STU;
int main()
{
	int i;
	FILE *fp;
	fp=fopen("list.txt","r");
	if (fp == NULL) {
    printf("fail to open file\n");
    exit(0);
    }

	STU s[80];
	STU b[5];
	while (!feof(fp)) 
	{
     for (i = 0; i <N; i++)
       fscanf(fp, "%ld %s %s", &s[i].no, s[i].name,s[i].cla);
    }
	srand(time(0));
	int a;
	for(int j=0;j<5;j++)
	{
	a=rand()%80;
	b[j]=s[a];
    } 
	for(int j=0;j<5;j++)
	printf("%-20ld%-20s%-20s\n",b[j].no,b[j].name,b[j].cla);
    fclose(fp);
    FILE *fin;
    fin=fopen("lucky.txt","w");
    for(int j=0;j<5;j++)
    fprintf(fin,"%-20ld%-20s%-20s\n",b[j].no,b[j].name,b[j].cla);
    fclose(fin);
    
    
   return 0;
}

  

 

标签:fp,ch,int,char,STU,实验,include
From: https://www.cnblogs.com/nxdlwk/p/17008835.html

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