实验七

TASK4:
`#define _CRT_SECURE_NO_WARNINGS

include <stdio.h>

include <ctype.h>

int main() {
FILE* fp;
int ch;
int line_count = 0;
int char_count = 0;
int in_new_line = 1;

fp = fopen("C:/data4.txt", "r");
if (fp == NULL) {
    printf("无法打开文件\n");
    return 1;
}

while ((ch = fgetc(fp)) != EOF) {
    if (ch == '\n') {
        line_count++;
        in_new_line = 1;
    }
    else if (!isspace(ch)) {
        char_count++;
        in_new_line = 0;
    }
    else if (in_new_line) {
        continue;
    }
}

if (!in_new_line) {
    line_count++;
}

fclose(fp);
printf("data4.txt统计结果：\n");
printf("行数: %d\n", line_count);
printf("字符数(不计空白符): %d\n", char_count);

return 0;

}`

TASK5:
`#define _CRT_SECURE_NO_WARNINGS

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...\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);
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("d:\\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);

}

// 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;
char str[] = "通过";
FILE* fin;

fin = fopen("list_pass.txt", "w");
if (!fin) {
    printf("fail to open fileto write\n");
    return;
}
fprintf(fin, "准考证号\t姓名\t\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++)
    if (!strcmp(st[i].result, str))
        fprintf(fin, "%ld\t%s\t%.2f\t\t%.2f\t\t%.2f\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);

fclose(fin);

}
// 对考生信息进行处理：计算每位考生考试总分、结果；统计考试通过的人数
int process(STU st[], int n, STU st_pass[]) {
int i, count = 0;
char str1[] = "通过", str2[] = "未通过";
for (i = 0; i < n; i++) {
st[i].sum = st[i].objective + st[i].subjective;
if (st[i].sum >= 60) {
strcpy(st[i].result, str1);
count += 1;
}
else
strcpy(st[i].result, str2);
}
return count;
}`

TASK6：
`#define _CRT_SECURE_NO_WARNINGS

include <stdio.h>

include <string.h>

include <stdlib.h>

include <time.h>

define STUDENT_COUNT 80

define SELECT_COUNT 5

define LINE_LENGTH 50

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

int main() {
Student students[STUDENT_COUNT];
FILE* fp = fopen("C:/list.txt", "r");
if (!fp) {
printf("无法打开文件 list.txt\n");
return 1;
}
for (int i = 0; i < STUDENT_COUNT; i++) {
fscanf(fp, "%s %s %s",
students[i].id,
students[i].name,
students[i].classInfo);
}
fclose(fp);

int selected[STUDENT_COUNT] = { 0 };
Student winners[SELECT_COUNT];
srand((unsigned int)time(NULL));

for (int i = 0; i < SELECT_COUNT; ) {
    int r = rand() % STUDENT_COUNT;
    if (!selected[r]) {
        selected[r] = 1;
        winners[i] = students[r];
        i++;
    }
}

printf("-------------中奖名单-------------\n");
for (int i = 0; i < SELECT_COUNT; i++) {
    printf("%s\t%s\t%s\n",
        winners[i].id,
        winners[i].name,
        winners[i].classInfo);
}

char filename[50];
printf("-------------保存到文件-------------\n");
printf("输入文件名：");
scanf("%s", filename);

FILE* outFp = fopen(filename, "w");
if (!outFp) {
    printf("无法创建文件 %s\n", filename);
    return 1;
}
for (int i = 0; i < SELECT_COUNT; i++) {
    fprintf(outFp, "%s\t%s\t%s\n",
        winners[i].id,
        winners[i].name,
        winners[i].classInfo);
}
fclose(outFp);
printf("保存成功！\n");

return 0;

}`