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6.1test.c
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6.1test.c
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#pragma once
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <float.h>
#include <assert.h>
#include <stdlib.h>
typedef struct BookInfo
{
char ISBN[10];
char name[20];
char author[10];
}Book;
typedef Book* book;
//typedef struct LNode
//{
// Book data;
// struct LNode* next;
//}Node;
int main()
{
Book book1 = { 0 };
book b;
b = (Book*)malloc(sizeof(Book));
printf("请输入ISBN号、书名、作者\n");
scanf("%s%s%s", b->ISBN, b->name, b->author);
/*printf("%s %s %s", b->ISBN, b->name, b->author);*/
/*printf("%s %s %s", book.ISBN, book.name, book.author);*/
FILE* pf = fopen("booklist11.txt", "w+");
///*fprintf(pf, "%s %s %s", book->ISBN, book->name, book->author);*/
//rewind(pf);
fseek(pf, 0, SEEK_SET);
fscanf(pf, "%s%s%s", b->ISBN, b->name, b->author);
///*fprintf(buf, 1, strlen(book1), pf);*/
fprintf(pf, "%s %s %s\n", b->ISBN, b->name, b->author);
fclose(pf);
return 0;
}
//int main()
//{
// char str1[10] = { 0 };
// char str2[10] = { 0 };
// FILE* pf = fopen("test1.txt", "w+");
// fprintf(pf, "%s", "hello world");
// rewind(pf);
// fscanf(pf, "%s", str1);
// fscanf(pf, "%s", str2);
// fclose(pf);
// printf("%s\n", str1);
// printf("%s\n", str2);
// return 0;
//}
//int main()
//{
// char str[80];
// float f;
// FILE* pFile;
//
// pFile = fopen("myfile.txt", "w+");
// fprintf(pFile, "%f %s", 3.1416, "PI");
// rewind(pFile);
// fscanf(pFile, "%f", &f);
// fscanf(pFile, "%s", str);
// fclose(pFile);
// printf("I have read: %f and %s \n", f, str);
// return 0;
//}
//#define GOLLON 3.785
//#define MILE 1.609
//int main()
//{
// float journey = 0.0;
// float consumption = 0.0;
// printf("请输入旅行的旅程和消耗的汽油量\n");
// scanf("%f%f", &journey, &consumption);
//
// printf("消耗每加仑汽油行驶的英里数是:%.1f\n", journey/consumption);
//
// printf("燃料消耗:%.1f\/100", MILE / GOLLON * 100);
// return 0;
//}
//int main()
//{
// double a;
// float b;
// float c = 3.0;
// a = 1.0 / 3.0;
// //浮点型常量默认作为双精度，如3.0并非float类型而是double类型，
// //这样做的好处是提高运算的精度但影响运算速度，因此，如果需要直接按float类型对数据进行运算，则在数字后面加f即可
// b = 1.0f / 3.0f; //1.0和3.0为double类型，防止出现"从double到float截断"警告，在1.0和3.0后加f，表示float类型
//
// printf("%f\n", c);
// printf("%.6lf, %.12lf, %.16lf\n", a, a, a);
// printf("%.6f, %.12f, %.16f\n", b, b, b);
// printf("%d, %d", FLT_DIG, DBL_DIG);
//
// return 0;
//}
//int main()
//{
// char name[10] = { 0 };
// char surname[10] = { 0 };
// printf("请先输入名再输入姓\n");
// scanf("%s%s", &name, &surname);
//
// printf("%s %s\n", name, surname);
// printf("%*zd %*zd\n", strlen(name), strlen(name), strlen(surname), strlen(surname));
//
// printf("%s %s\n", name, surname);
// printf("%-*zd %-*zd\n", strlen(name), strlen(name), strlen(surname), strlen(surname));
//
// return 0;
//}
//int main()
//{
// float speed = 0.0;
// float fsize = 0.0;
// printf("请输入下载速度以兆位每秒(Mb/s)为单位的下载速度和以兆字节(MB)为单位的文件大小\n");
// scanf("%f%f", &speed, &fsize);
// printf("At %.2f megabits per second, a file of %.2f megabits\n", speed, fsize);
// printf("download in %.2f seconds.", fsize/speed);
// return 0;
//}
//int main()
//{
// float height = 0.0;
// char name[10] = { 0 };
// printf("please enter your height and name\n");
// scanf("%f%s", &height,name);
// printf("%s, you are %.3f feet tall\n", name, height);
// return 0;
//}
//int main()
//{
// float a = 21.29;
// printf("The input is %.1f or %.1e\n", a, a);
// return 0;
//}
//#define BOOK "War and Peace"
//int main()
//{
// float cost = 12.99;
// float percent = 80.0;
//
// printf("This copy of %s sells for $%.2f.\n", BOOK, cost);
// printf("That is %.0f%c of list.", percent, '%'); // .0f表示以浮点型打印，且舍弃小数位。
// return 0;
//}
//
//int main()
//{
// char str[10] = {"hello"};
// printf("%zd", strlen(str));//strlen不读取结尾空字符"/0"
// return 0;
//}