C++工资管理系统

#include<iostream.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define FILENAME "staff.txt"             
 //数据文件
/////////////////////////////////////////////
struct Staff             
//职工机构体{char CarNumber[10];         
//卡号char Name[10];              
//姓名int Month;                  
//月份float SPWages;              
//应发工资float APWages;    
 //实发工资float Water;     
//水费float Electrical;    
//电费float Tax;      
//税金};
////////////////////////////////////////////// 文件操作模块FILE *FP;       
//全局文件指针FILE * FileOpen(char FileName[])                  
//文件打开函数{FILE *fp;
if((fp=fopen(FileName,"r"))==NULL)
{fp=fopen(FileName,"w");
cout<<"文件打开失败重新创建记录文件";
return fp;}fp=fopen(FileName,"r+");return fp;
}
void FileClose(FILE *fp)
{
if(fclose(fp)==0)cout<<"安全关闭"<<endl;
else cout<<"文件关闭失败"<<endl;
}

////////////////////////////////////////////////
void Increase()              
//添加职工信息
{
FP=FileOpen(FILENAME);
Staff temp;cout<<endl;
cout<<"请输入姓名：";
cin>>temp.Name;
cout<<"请输入卡号：";
cin>>temp.CarNumber;
cout<<"请输入月份：";
cin>>temp.Month;cout<<"请输入应发工资：";
cin>>temp.SPWages;
cout<<"请输入水费：";
cin>>temp.Water;cout<<"请输入电费：";
cin>>temp.Electrical;
if(temp.SPWages<=800) temp.Tax=0;
if((temp.SPWages>800.0)&&(temp.SPWages<1400.0)) temp.Tax=(temp.SPWages-800)*0.05;
if(temp.SPWages>1400)temp.APWages=temp.SPWages-temp.Water-temp.Electrical-temp.Tax;
fwrite(&temp,sizeof(temp),1,FP);
cout<<"信息添加成功,请选择浏览工资信息选项进行查看"<<endl;
FileClose(FP);
}
//////////////////////////////////////////////void PrintInformation()   
//浏览工资信息{FP=FileOpen(FILENAME);
rewind(FP);Staff temp;
while(fread(&temp,sizeof(Staff),1,FP)==1){   cout<<"姓名："<<temp.Name<<endl;
   cout<<"卡号："<<temp.CarNumber<<endl;
   cout<<"月份："<<temp.Month<<endl; 
  cout<<"应发工资："<<temp.SPWages<<endl;