实验七

实验任务四

代码

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#include<stdio.h>
#include<ctype.h>
int main(){
    FILE *fp;
    fp=fopen("data4.txt","r");
    if(fp==NULL){
    printf("打不开，有问题 \n");
    return 1;
} 
    int line=0,cha=0,c;
    while((c=fgetc(fp))!=EOF){
        if(c=='\n')
        line++;
        if(c!=' ' &&c!='\t'&&c!='\n')
        cha++;
        }
        if(cha>0 &&(c!='\n'))
        line++;
        printf("date4.txt 统计结果: \n");
        printf("行数:\t%d\n",line);
        printf("字符数(不计空白符):\t%d\n",cha);
        fclose(fp);
        return 0;
    }

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实验任务五

代码

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#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;
}

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 *fp;
    int i;
    fp=fopen("list_pass.txt","w");
    fprintf(fp,"准考证号  姓名  客观题得分  操作题得分   总分      结果\n");
    for(i=0;i<n;i++)
        if(strcmp(s[i].result,"通过")==0)
            fprintf(fp,"%-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);
}

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

截图

实验任务六

代码

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

int main(){
	char info[N][80];
	int i;
	char filename[N];
	int lucky_index;

	FILE *fp;
	fp=fopen("D:\\list.txt","r");
	if(!fp){
		printf("fail to open file to read\n");
		system("pause");
		return 1;
}
	for(i=0;i<N;++i)
		fgets(info[i],80,fp);
	fclose(fp);
	printf("----------------保存到文件-----------------\n");
	printf("输入文件名: ");
	scanf("%s",&filename);
	fp = fopen(filename, "a");
	srand(time(NULL));
	printf("----------------中奖名单-----------------\n");
	for(i=0;i<5;++i){
		lucky_index=rand()% N;
		printf("%s",info[lucky_index]);
		fprintf(fp, "%s\n",info[lucky_index]);
	}

    fclose(fp);
    printf("文件保存成功!\n");

	system("pause");
	return 0;
}

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