Experiment 7

Experiment 7

Task 4

image-20251224215417178

#include <stdio.h>
int main(){
    FILE* fp;
    fp=fopen("./data4.txt","r");
    char c;
    int lines=0,chars=0;
    while((c=fgetc(fp)) != EOF){
    	if (c != ' ' && c != '\t' && c != '\n'){
    		chars++;
		}
		else if(c == '\n'){
			lines++;
		}
	}
    fclose(fp);
	printf("data4.txt统计结果:\n行数:\t\t%d\n字符数:\t%d",lines+1,chars);
    return 0;
}

image-20251224220612994

Task 5

image-20251224220727827

#include <stdio.h>
#include <string.h>
#define N 10

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

// 函数声明
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);   // 输出所有考生完整信息到屏幕
    write(stu, N);    // 输出考试通过的考生信息到文件

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

    return 0;
}

// 把所有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].result);
}

// 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 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);
}

// 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 write(STU st[], int n) {
    int i;
    FILE* fout;
    fout = fopen("./list_pass.txt","w"); 
    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\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", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);
    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,ans=0;
    for(i=0;i<n;i++){
    	st_pass[i].id = st[i].id;
    	strcpy(st_pass[i].name,st[i].name);
    	st_pass[i].objective = st[i].objective;
    	st_pass[i].subjective = st[i].subjective;
    	st[i].sum = st[i].subjective+st[i].objective;
    	st_pass[i].sum = st[i].sum; 
    	if (st[i].sum >= 60.0){
    		strcpy(st_pass[i].result,"通过");
    		strcpy(st[i].result,"通过");
    		//printf("Log:%lf\t%d:%s\n",st[i].sum,st[i].id,st[i].result); 
			ans++; 
		}
		else{
			strcpy(st_pass[i].result,"不通过"); 
			strcpy(st[i].result,"不通过");	
		}
	}
	return ans;
}

image-20251224223333416

Task 7

image-20251224223458803

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
typedef struct{
	char info[50];//太小不行!! 
	char id[20];
}STU;
int cmp(const void *a, const void *b) {
	const STU *pa = (const STU *)a;
	const STU *pb = (const STU *)b;
	return strcmp(pa->id,pb->id);
}
	
void strcpyid(char dest[],char src[]){
	int i=0; 
	for(i;src[i]>='0' && src[i]<='9';i++){
		dest[i]=src[i];
	}
}
int main()
{
    int random_variable,i=0,flag[100]={0},j;
	char lines[100][100],filename[20];
	FILE* fin;
	FILE* fout;
	fin = fopen("./list.txt","r"); 
	
	//格式化获取当前时间->filename=time_str+".txt"; 
	time_t t = time(NULL);
	strftime(filename,sizeof(filename),"%Y%m%d",localtime(&t));
	strcpy(filename+strlen(filename),".txt");//添加偏移量实现拼接 
	fout=fopen(filename,"w");
	
	//加载文件 
	while(fgets(lines[i],100,fin) != NULL){
		i++;
	}
	
    printf("Persisent path:     ./%s\n",filename);
	printf("-----获奖名单-----\n"); 
	
	STU stu[5];
	j = 5;
	while(j){
		srand(time(NULL));
		random_variable = rand()%i;
		if (flag[random_variable] != 1){
			flag[random_variable] = 1;
			strcpy(stu[5-j].info,lines[random_variable]);
			strcpyid(stu[5-j].id,lines[random_variable]);
			j--; 
		}
	}
	//for(j=0;j<5;j++){printf("%s",stu[j].info);}
	qsort(stu,sizeof(stu)/sizeof(stu[0]),sizeof(stu[0]),cmp);//偷懒失败!cmp必须函数内强制转化类型??! 
	for(j=0;j<5;j++){
		printf("%s",stu[j]);
		fprintf(fout,"%s",stu[j]);
	}
	fclose(fin);
	fclose(fout);
 	return 0;
}

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posted @ 2025-12-25 00:44  copyleft0319  阅读(9)  评论(0)    收藏  举报