实验7
任务4
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#define _CRT_SECURE_NO_WARNINGS
#include <stdlib.h>
#include <stdio.h>
void countFile()
{
FILE *fp;
char ch;
int lines = 1;
int chars = 0;
fp = fopen("data4.txt", "r");
if(fp == NULL)
{
printf("fail to open file\n");
return;
}
while((ch = fgetc(fp)) != EOF)
{
if(ch == '\n')
{
lines++;
}
else if(ch != ' ' && ch != '\t' && ch != '\r')
{
chars++;
}
}
fclose(fp);
printf("文件行数:%d\n", lines);
printf("字符数:%d\n", chars);
}
int main()
{
countFile();
system("pause");
return 0;
}

任务5
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#include <stdio.h>
#include <string.h>
#include <stdlib.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: 已完成\n", N);
read(stu, N);
printf("\n对考生成绩进行统计: 已完成\n");
cnt = process(stu, N, stu_pass);
printf("\n所有考生完整信息:\n");
output(stu, N);
printf("\n通过考试的名单写入文件: 已完成!\n");
write(stu_pass, cnt);
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;
}
// 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);
}
// 对考生信息进行处理:计算每位考生考试总分、结果;统计并返回通过考试的人数
int process(STU st[], int n, STU st_pass[]) {
int passNum = 0;
int i;
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[passNum++] = st[i];
}
else
{
strcpy(st[i].result, "不通过");
}
}
return passNum;
}
// 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 = fopen("list_pass.txt", "w");
if (!fout)
{
printf("打开输出文件失败!\n");
return;
}
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);
}


任务6
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#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#define MAX_STU 80
#define LEN 50
typedef struct {
char id[20];
char name[LEN];
char cls[LEN];
} Student;
int main()
{
Student stu[MAX_STU];
Student win[5];
int flag[MAX_STU] = {0};
int total = 0;
int win_cnt = 0;
char filename[LEN];
FILE* fp;
FILE* fout;
int i;
fp = fopen("list.txt", "r");
if (fp == NULL) {
printf("无法打开list.txt,请确保文件与代码在同一目录!\n");
system("pause");
return 1;
}
while (fscanf(fp, "%s %s %[^\n]", stu[total].id, stu[total].name, stu[total].cls) == 3) {
total++;
}
fclose(fp);
srand((unsigned int)time(NULL));
while (win_cnt < 5) {
int idx = rand() % total;
if (flag[idx] == 0) {
flag[idx] = 1;
win[win_cnt] = stu[idx];
win_cnt++;
}
}
printf("========== 中奖名单 ==========\n");
for (i = 0; i < 5; i++) {
printf("%s\t%s\t%s\n", win[i].id, win[i].name, win[i].cls);
}
printf("\n请输入保存文件名(例如 result.txt):");
scanf("%s", filename);
fout = fopen(filename, "w");
if (fout == NULL) {
printf("文件创建失败!\n");
system("pause");
return 1;
}
for (i = 0; i < 5; i++) {
fprintf(fout, "%s %s %s\n", win[i].id, win[i].name, win[i].cls);
}
fclose(fout);
printf("保存成功!已写入文件 %s\n", filename);
system("pause");
return 0;
}


posted on 2026-06-23 16:52 kobebrant24 阅读(7) 评论(0) 收藏 举报
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