C++ class program to perform complex arithmetic using operator overloading

#include<iostream.h>
#include<stdio.h>
#include<conio.h>
#include<process.h>
class complex
{
int real;
float image;
public:
void getdata()
{
cout<<"\n enter the real part of the complex";
cin>>real;
cout<<"\n enter the imaginary part of the complex";
cin>>image;
}
void operator + (complex);
void operator - (complex);
};
 
void complex :: operator +  (complex c1)
{
complex temp;
temp.real=real+c1.real;
temp.image=image+c1.image;
if (temp.image>=0);
{
cout<<"\n complex no. after addition:";
cout<<temp.real<<"+"<<temp.image<<"i";
}
else
{
cout<<"\n complex no. after addition ";
cout<<temp.real<<temp.image<<"i";
}
}
void complex ::operator-(complex c1)
{
complex temp;
temp.real = real-c1.image;
temp.image= image-c1.image;
if (temp.image>=0)
{
cout<<"\n complex no. after subtraction";
cout<<"\n temp.real<<"+"<<temp.image<<"i";
}
else
{
cout<<"\n complex no. after subtraction";
cout<<temp.real<<temp.image<<"i"
}
}
void main()
{
clrscr();
comp.ex c1, c2;
int n;
do 
{
cout<<"\n 1. Input data for complex no. ";
cout<<"\n 2. Addition of complex no. ";
cout<<"\n 3. Subtraction of complex no. ";
cout<<"\n 4. Quit";
cout<<"\n Enter your choice";
cin>>n;
switch(n)
 
{ 
case1:
cout<<endl<<"\n Enter the data for First Complex No......";
cl.getdata();
cout<<endl<<"\n Enter the data for seconds Complex No.....";
c2.getdata();
clrscr();
break;
 
case 2;
cl+c2;
getch();
clrscr();
break;
 
case 3:
cl-c2;
getch();
clrscr();
brak;
 
case 4:
exit91);
break;
}
} while (n!=4);
getch();
}