实验七

task4

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>

int main() {
FILE* fp;
int lineCount = 0;
int charCount = 0;
char ch;
fp = fopen("data4.txt", "r");
if (fp == NULL) {
perror("Failed to open file");
system("pause");
return 1;
}

 

while ((ch = fgetc(fp)) != EOF) {
if (ch == '\n') {
lineCount++;
}
else if (ch != ' ' && ch != '\t') {
charCount++;
}
}
lineCount++;

fclose(fp);

printf("data4.txt统计结果：\n");
printf("行数：\t\t%d\n", lineCount);
printf("字符数(不计空白符)：\t%d\n", charCount);

system("pause");
return 0;
}

 

task5

#include <stdio.h>
#include <stdlib.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_pass, cnt); // 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);

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);
}

// 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");
if (!fout) {
printf("fail to open file for writing\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);
}

// 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, cnt = 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[cnt++] = st[i];
}
else {
strcpy(st[i].result, "不通过");
}
}

return cnt;
}

 

 task6

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

#define STUDENT_COUNT 80
#define LINE_LENGTH 50

typedef struct {
char id[15];
char name[20];
char classInfo[30];
} Student;

int main() {
Student students[STUDENT_COUNT];
int selected[STUDENT_COUNT] = { 0 };
FILE* file;
int i, j;
char filename[50];

srand((unsigned int)time(NULL));

file = fopen("list.txt", "r");
if (file == NULL) {
printf("无法打开 list.txt 文件！\n");
return 1;
}

for (i = 0; i < STUDENT_COUNT; i++) {
fscanf(file, "%s %s %s", students[i].id, students[i].name, students[i].classInfo);
}
fclose(file);

printf("-------------中奖名单-------------\n");
for (i = 0; i < 5; i++) {
int index;
do {
index = rand() % STUDENT_COUNT;
} while (selected[index] == 1);

selected[index] = 1;
printf("%-12s %-10s %s\n", students[index].id, students[index].name, students[index].classInfo);
}

printf("-------------保存到文件-------------\n");
printf("输入文件名：");
scanf("%s", filename);

file = fopen(filename, "w");
if (file == NULL) {
printf("无法创建文件！\n");
return 1;
}

for (i = 0; i < STUDENT_COUNT; i++) {
if (selected[i] == 1) {
fprintf(file, "%-12s %-10s %s\n", students[i].id, students[i].name, students[i].classInfo);
}
}
fclose(file);

printf("保存成功！\n");

system("pause");
return 0;
}