二进制文件存取与追加.doc

例：学生信息存储创建二进制文件#include#includeusing namespace std;class CStudentstruct studentchar name20;char gender;int age;float avescore;srec;fstream file;public:CStudent();CStudentapp();CStudent();void createfile();CStudent:CStudent()file.open(d:student.bin,ios:out|ios:binary);if(file.fail()coutcan not create filen;return;CStudent:CStudent()file.close();void CStudent:createfile()char yn;coutyn;while(yn=Y|yn=y)coutName:(use ; to end);for(int i=0;i;if(i=;)break;i=0;coutsrec.gender;coutsrec.age;coutsrec.avescore;file.write(char *)&srec,sizeof(srec);coutyn;void main()CStudent stu;stu.createfile();例：学生信息存储追加学生信息到二进制文件#include#includeusing namespace std;class CStudentstruct studentchar name20;char gender;int age;float avescore;srec;fstream file;public:CStudent();CStudent();void createfile();void appendfile();CStudent:CStudent()file.close();void CStudent:appendfile()char yn;coutyn;while(yn=Y|yn=y)coutName:(use ; to end);for(int i=0;i;if(i=;)break;i=0;coutsrec.gender;coutsrec.age;coutsrec.avescore;file.write(char *)&srec,sizeof(srec);coutyn;CStudent:CStudent()file.open(d:student.bin,ios:out|ios:binary|ios:nocreate);if(file.fail()coutcan not create filen;return;file.seekg(0,ios:end);void main()CStudent stu;stu.appendfile();例：学生信息存储输出二进制文件#include#includeusing namespace std;class CStudentstruct studentchar name20;char gender;int age;float avescore;srec;fstream file;public:CStudent();CStudent();void printfile();CStudent:CStudent()file.close();void CStudent:printfile()file.read(char*)&srec,sizeof(srec);while(!file.eof()coutName:,gender:srec.gender,;coutage :srec.age,avescore:srec.avescoreendl;file.read(char*)&srec,sizeof(srec);CStudent:CStudent()file.open(d:student.bin,ios:in|ios:binary|ios:nocr