武汉工程大学-网络工程-工资管理软件.doc

#include #include #include #include using namespace std; struct EMPchar name25;float salary;int deleted;void main()EMP e;strcpy(,NULL);e.salary = 0;e.deleted = 0;while(1)char c;cout;cin.get(c);if(c = n)coutName: ;;cine.salary;e.deleted = 0;else if(c = s)if(strcmp(,NULL) = 0)coutnEnter employee data before trying to save;continue;ofstream file;file.open(EMP.DAT,ios:app|ios:binary);if(! file)coutnFailed to save data;continue;file.write(char *)&e,sizeof(e);file.close();coutnFile saved;else if(c = l)ifstream infile ;infile.open (EMP.DAT,ios:binary);if(! infile)coutnFailed to read file;continue ;long curpos,length;curpos = infile.tellg();infile.seekg(0L,ios:end);length = infile.tellg();infile.seekg(0L,ios:beg);long num_recs = length / sizeof(e);for(long l = 0;lnum_recs;l+)infile.read(char *)&e,sizeof(e);coutnName: ;coutnSalary: e.salary;infile.close();coutnntRecords: num_recs;else if(c = h)coutnn - Newns - Savenl - Listnq - Quit;else if(c = q)break;else if(c = f)ifstream infile1;infile1.open(EMP.DAT,ios:binary);if(! infile1)coutFailed to open file;continue;coutEnter employee name: f;long curpos,length;curpos = infile1.tellg();infile1.seekg(0L,ios:end);length = infile1.tellg();infile1.seekg(0L,ios:beg);long num_recs = length / sizeof(e);int found = 0;for(long l = 0;lnum_recs;l+)infile1.read(char *)&e,sizeof(e);if(strcmp( ,f) = 0)coutnName: ;coutnSalary: e.salary ;found = 1;if(found = 0)coutRecord not found ;infile1.close ();else if(c = d)ifstream infile2;ofstream temp_file;infile2.open (EMP.DAT,ios:binary);if(! infile2)coutFailed to load data;continue ;temp_file.open(EMP_TEMP.DAT,ios:binary);if(! temp_file)coutFailed to creat temp file;continue;coutf;long curpos,length;curpos = infile2.tellg();infile2.seekg(0L,ios:end);length = infile2.tellg();infile2.seekg(0L,ios:beg);long num_recs = length / sizeof(e);int found = 0;for(long l = 0;lnum_recs;l+)infile2.read(char *)&e,sizeof(e);if(strcmp( ,f) = 0)e.deleted = 1;found = 1;temp_file.write (char *)&e,sizeof(e);infile2.close();temp_file.close ();if(found = 0)coutRecord not found ;continue ;ofstream outfile(EMP.DAT,ios:binary);ifstream infile3(EMP_TEMP.DAT,ios:binary);curpos = infile3.tellg ();infile3.seekg(0L,ios:end);length = infile3.tellg();infile3.seekg(0L,ios:beg);num_recs = length / sizeof(e);for(l = 0;lnum_recs;l+)infile3.read(char *)&e,sizeof(e);if(e.deleted = 0)outfile.write (char *)&e,sizeof(e);infile3.close ();outfile.close ();coutRecord deleted;else if(c = e)ifstream infile4;infile4.open (EMP.DAT,ios:binary);if(! infile4)coutFailed to open file;continue ;coutf;long curpos,length;curpos = infile4.tellg();infile4.seekg(0L,ios:end);length = infile4.tellg();infile4.seekg(0L,ios:beg);long num_recs = length / sizeof(e);int found = 0;char new_name25;float new_sal;EMP new_emp;long write_at;for(long l = 0;lnum_recs;l+)infile4.read(char *)&e,sizeof(e);if(strcmp( ,f) = 0)coutnew_name;coutnew_sal;strcpy(new_,new_name);new_emp.salary = new_sal;new_emp.deleted = 0;found = 1;write_at = l;break;infile4.close ();if(found = 1)write_at = write_at *sizeof(new_emp);fstream file (EMP.DAT,ios:binary|ios:in|ios:out);if(! file)coutEditing failed;continue;fi