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統計結果:\n");
printf("行數:\t\t%d\n", lineCount);
printf("字符數(不計空白符):\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; // 準考證號
char name[20]; // 姓名
float objective; // 客觀題得分
float subjective; // 操作題得分
float sum; // 總分
char result[10]; // 考試結果
} STU;
// 函數聲明
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("從文件讀入%d個考生信息...\n", N);
read(stu, N);
printf("\n對考生成績進行統計...\n");
cnt = process(stu, N, stu_pass);
printf("\n通過考試的名單:\n");
output(stu, N); // 輸出所有考生完整信息到屏幕
write(stu_pass, cnt); // 輸出考試通過的考生信息到文件
pass_rate = 1.0 * cnt / N;
printf("\n本次等級考試通過率: %.2f%%\n", pass_rate * 100);
system("pause");
return 0;
}
// 把所有考生完整信息輸出到屏幕上
// 準考證號,姓名,客觀題得分,操作題得分,總分,結果
void output(STU st[], int n) {
int i;
printf("準考證號\t姓名\t客觀題得分\t操作題得分\t總分\t\t結果\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);
}
// 從文本文件examinee.txt讀入考生信息:準考證號,姓名,客觀題得分,操作題得分
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);
}
// 把通過考試的考生完整信息寫入文件list_pass.txt
// 準考證號,姓名,客觀題得分,操作題得分,總分,結果
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, "準考證號\t姓名\t客觀題得分\t操作題得分\t總分\t\t結果\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);
}
// 對考生信息進行處理:計算每位考生考試總分、結果;統計考試通過的人數
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, "通過");
st_pass[cnt++] = st[i];
}
else {
strcpy(st[i].result, "不通過");
}
}
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("無法打開 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("-------------中獎名單-------------\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("輸入文件名:");
scanf("%s", filename);
file = fopen(filename, "w");
if (file == NULL) {
printf("無法創建文件!\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;
}


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