/*
Name: s.ramkumar 

Description:my program demonstrate how the over loading task has been implemented.the program contains three different funtions.
1)matrix multiplication 
2)adding complex number.
3)difference between system time and user input time.
all this process are done with overloading by using of objects.it is useful to learners of overloading in c++
*/

#include<iostream.h> 
#include<dos.h> 
#include<conio.h> 
long int hh1,mm1,ss1; 
class over 
{ 
private: 
int a[3][3]; 
int re,im; 
long hh,mm,ss; 
int i,j,k; 
public: 
void getmat(); 
void dismat(); 
void getcom(); 
void discom(); 
void getutime(); 
void getstime(); 
void distime(); 
over operator *(over o4); 
over operator +(over o5); 
over operator -(over o6); 
}; 

void over ::getmat() 
{ 
cout<<"enter matrix elements:\n"; 
for(i=0;i<3;i++) 
{ 
for(j=0;j<3;j++) 
{ 
cin>>a[i][j]; 
} 
} 
} 
void over ::dismat() 
{ 
for(i=0;i<3;i++) 
{ 
for(j=0;j<3;j++) 
{ 
cout<<a[i][j]<<"\t"; 
} 
cout<<"\n"; 
} 
} 
over over ::operator *(over o4) 
{ 
over temp; 
for(i=0;i<3;i++) 
{ 
for(j=0;j<3;j++) 
{ 
temp.a[i][j]=0; 
for(k=0;k<3;k++) 
{ 
temp.a[i][j]=temp.a[i][j]+a[i][k]*o4.a[k][j]; 
} 
} 
} 
return temp; 
} 
void over ::getcom() 
{ 
cout<<"\n\nenter real part:"; 
cin>>re; 
cout<<"\nenter imaginary part:"; 
cin>>im; 
} 
void over ::discom() 
{ 
//cout<<"\nreal part="<<re; 
//cout<<"\nimaginary="<<im; 
cout<<"\naddition="<<re<<"+i"<<im; 
} 
over over ::operator +(over o5) 
{ 
over temp; 
temp.re=re+o5.re; 
temp.im=im+o5.im; 
return temp; 
} 
void over ::getutime() 
{ 
cout<<"enter your time:\n"; 
cin>>hh>>mm>>ss; 
clrscr(); 
cout<<"your time:\n"; 
cout<<hh<<":"<<mm<<":"<<ss; 
hh=hh*3600; 
mm=mm*60; 
ss=hh+mm+ss; 
} 
void over ::getstime() 
{ 
struct time t; 
gettime(&t); 
hh=t.ti_hour; 
mm=t.ti_min; 
ss=t.ti_sec; 
cout<<"\nsystem time\n"; 
cout<<hh<<":"<<mm<<":"<<ss; 
hh=hh*3600; 
mm=mm*60; 
ss=ss+hh+mm; 

} 
over over ::operator -(over o6) 
{ 
over temp;long ans,ans1; 

ans=o6.ss-ss; 
temp.hh=ans/3600; 
ans1=ans%3600; 
temp.mm=ans1/60; 
temp.ss=ans1%60; 
return temp; 
} 
void over ::distime() 
{ 
cout<<hh<<":"<<mm<<":"<<ss; 
} 
void main() 
{ 
over o1,o2,o3; 
clrscr(); 
highvideo(); 
cout<<"matrix multiplication"; 
cout<<"\na matrix:\n\n"; 
o1.getmat(); 
cout<<"b matrix:\n\n"; 
o2.getmat(); 
o3=o1*o2; 
o3.dismat(); 
getch(); 
clrscr(); 

cout<<"complex number addition:"; 
o1.getcom(); 
o2.getcom(); 
cout<<"\naddition:"; 
o3=o1+o2; 
o3.discom(); 
getch(); 
clrscr(); 

cout<<"time difference\n\n"; 
o1.getutime(); 
o2.getstime(); 
o3=o1-o2; 
cout<<"\nyour time in seconds:\n"; 
o1.distime(); 
cout<<"\nsystime in seconds:\n"; 
o2.distime(); 
cout<<"\ndifference in 12 basis:\n"; 
o3.distime(); 
getch(); 
}