高级语言程序设计课程第十次个人作业

这个作业属于哪个课程：https://edu.cnblogs.com/campus/fzu/2024C

这个作业要求在哪里： https://edu.cnblogs.com/campus/fzu/2024C/homework/13314

学号：<102400227>

姓名：<谭培>

1：电脑上可以运行但是没有执行命令,原来是没有找到文件，添加文件路径或保存在相同路径就解决了

#include <stdio.h>
int main() {
	int ch;
	FILE *fp1, *fp2;
	fp1 = fopen("in.txt","r");
	fp2 = fopen("out.txt","w");
	while((ch = fgetc(fp1)) != EOF){
		fputc(ch,fp2);
	}
	fclose(fp1);
	fclose(fp2);
	return 0;
}

2:fseek应当与末尾偏移量为-1，因为终止符占1位

#include <stdio.h>
int main() {
	FILE *fp1;
	fp1 = fopen("in.txt","r");
	fseek( fp1, -1 , 2);
	int len=ftell(fp1);
	printf("%d",len);
    fclose(fp1);
	return 0;
}

3:把输出换成标准流就好啦

#include <stdio.h>
int main() {
	int ch;
	FILE *fp1, *fp2;
	fp1 = fopen("in.txt","r");
	while((ch = fgetc(fp1)) != EOF){
		fputc(ch,stdout);
	}
	fclose(fp1);
	return 0;
}

4:正常读入数据，没问题

#include <stdio.h>
int main() {
	int ch;
	FILE *fp1, *fp2;
	fp1 = fopen("in.txt","r");
	while((ch = fgetc(stdin)) != EOF){
		fputc(ch,fp1);
	}
	fclose(fp1);
	return 0;
}

5：了解到一行长度是有限的，所以设置一个阈值防止溢出

#include <stdio.h>
#define BUF_SIZE 256
char buffer[BUF_SIZE];//防止溢出

int main()
{
	FILE* fp1, * fp2;
	fp1 = fopen("Take Me Hand.txt", "r+");
	fp2 = fopen("out", "w+");
	if (!fp1)
		exit(0);

	const char* predicate = "In my dreams I feel your light\n";
	while (fgets(buffer, sizeof(buffer), fp1))
	{
		if (!strcmp(buffer, predicate))
			continue;
		fputs(buffer, fp2);
	}

	fclose(fp1);
	fclose(fp2);
	return 0;
}

6:没问题，书上有

#include <stdio.h>
int main() {
	FILE *fp1;
	fp1 = fopen("in.txt","r");
	fseek( fp1, -1 , 2);
	int len=ftell(fp1);
	printf("%d",len);
    fclose(fp1);
	return 0;

7：使用了结构体将数据分类更清晰，使用函数使得各部分任务有条理

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

#define CSIZE 5

typedef struct {
    char id[11];
    char first[11];
    char last[11];
} full_name;

typedef struct {
    full_name name;
    double grade[3];
    double average;
} student;

// 输入学生信息
void input_student_info(student list[]) {
    char c;
    for (int i = 0; i < CSIZE; i++) {
        printf("Please enter student %d's id:\n", i + 1);
        scanf("%10s", list[i].name.id);
        printf("Please enter student %d's name:\n", i + 1);
        if (scanf("%10s %10s", list[i].name.first, list[i].name.last) == 2) {
            printf("Now,enter the 3 scores of this student:\n");
            if (scanf("%lf%lf%lf", &list[i].grade[0], &list[i].grade[1], &list[i].grade[2]) == 3) {
                printf("Well,continue.\n");
            }
            // 清空输入缓冲区
            while ((c = getchar())!= '\n' && c!= EOF);
        }
    }
}

// 计算平均成绩
void calculate_average(student list[]) {
    for (int i = 0; i < CSIZE; i++) {
        double sum = 0;
        for (int j = 0; j < 3; j++) {
            sum += list[i].grade[j];
        }
        list[i].average = sum / 3;
    }
}

// 将数据写入文件
void write_to_file(student list[]) {
    FILE *fp = fopen("student.txt", "w+");
    if (fp == NULL) {
        perror("Error opening file");
        return;
    }
    fprintf(fp, "%-10s %-10s %-10s%12s%20s\n", "ID", "First Name", "Last Name", "Grades", "Average");
    for (int i = 0; i < CSIZE; i++) {
        fprintf(fp, "%-10s%-10s%-10s %.2f %.2f %.2f %10.2f\n", list[i].name.id, list[i].name.first, list[i].name.last,
                list[i].grade[0], list[i].grade[1], list[i].grade[2], list[i].average);
    }
    fclose(fp);
}

int main() {
    student list[CSIZE] = {};
    input_student_info(list);
    calculate_average(list);
    write_to_file(list);
    return 0;
}