C++ : Friend Function 5

Question:7
Class time (h, m and s)
C++ program to declare a class named time with attributes as h, m and s. Take input for two times calculate and display their sum.
Sol:

Solution In CodeBlocks/DevC++

#include<iostream>
#include<conio.h>
using namespace std;
class time
{
private:
  int h,m,s;
public:
  void read();
  void show();
  friend time add(time t1,time t2);
};
void time::read()
{
  cout<<"enter h,m and s ";
  cin>>h>>m>>s;
}
void time::show()
{
  cout<<h<<" : "<<m<<" : "<<s<<endl;
}
time add(time t1,time t2)
{
  time t;
  t.h=t1.h+t2.h;
  t.m=t1.m+t2.m;
  t.s=t1.s+t2.s;
  if(t.s>=60)
  {
    t.m=t.m+t.s/60;
    t.s=t.s%60;
  }
  if(t.m>=60)
  {
    t.h=t.h+t.m/60;
    t.m=t.m%60;
  }
  return(t);
}
int main()
{
  /* clrscr(); */
  time e1,e2,e3;
  e1.read();e2.read();
  e1.show();e2.show();
  e3=add(e1,e2);
  e3.show();
  getch();
  return(0);
}
 
/* Output */

enter h,m and s 5 35 45
enter h,m and s 8 45 50
5 : 35 : 45
8 : 45 : 50
14 : 21 : 35

Solution In Turboc3

/* this program is developed in turboc3 */
#include<iostream.h>
#include<conio.h>
class time
{
private:
  int h,m,s;
public:
  void read();
  void show();
  friend time add(time t1,time t2);
};
void time::read()
{
  cout<<"enter h,m and s ";
  cin>>h>>m>>s;
}
void time::show()
{
  cout<<h<<" : "<<m<<" : "<<s<<endl;
}
time add(time t1,time t2)
{
  time t;
  t.h=t1.h+t2.h;
  t.m=t1.m+t2.m;
  t.s=t1.s+t2.s;
  if(t.s>=60)
  {
    t.m=t.m+t.s/60;
    t.s=t.s%60;
  }
  if(t.m>=60)
  {
    t.h=t.h+t.m/60;
    t.m=t.m%60;
  }
  return(t);
}
void main()
{
  clrscr();
  time e1,e2,e3;
  e1.read();e2.read();
  e1.show();e2.show();
  e3=add(e1,e2);
  e3.show();
  getch();
}
/* Output */

enter h,m and s 5 35 45
enter h,m and s 8 45 50
5 : 35 : 45
8 : 45 : 50
14 : 21 : 35

Question:8
Class string(str)
C++ program to declare a class named string with attribute as “str”. Take input for two strings and concatenate(join) them.
Sol:

Solution In CodeBlocks/DevC++

#include<iostream>
#include<conio.h>
#include<string.h>
using namespace std;

class string1
{
  char str[20];
public:
  void read();
  void show();
  friend string1 add(string1 s1,string1 s2);
};
void string1::read()
{
  cout<<"Enter any string ";
  cin>>str;
}
void string1::show()
{
  cout<<"string is "<<str<<endl;
}
string1 add(string1 s1,string1 s2)
{
  string1 t;
  strcpy(t.str,s1.str);
  //strcat(t.str," ");
  strcat(t.str,s2.str);
  return(t);
}
int main()
{
  /* clrscr(); */
  string1 e1,e2,e3;
  e1.read();e2.read();
  e1.show();e2.show();
  e3=add(e1,e2);
  e3.show();
  getch();
  return(0);
}
 
/* Output */

Enter any string Hello
Enter any string World
string is Hello
string is World
string is HelloWorld

Solution In Turboc3

/* this program is developed in turboc3 */
#include<iostream.h>
#include<conio.h>
#include<string.h>
class string
{
  char str[20];
public:
  void read();
  void show();
  friend string add(string s1,string s2);
};
void string::read()
{
  cout<<"Enter any string ";
  cin>>str;
}
void string::show()
{
  cout<<"string is "<<str<<endl;
}
string add(string s1,string s2)
{
  string t;
  strcpy(t.str,s1.str);
  //strcat(t.str," ");
  strcat(t.str,s2.str);
  return(t);
}
void main()
{
  clrscr();
  string e1,e2,e3;
  e1.read();e2.read();
  e1.show();e2.show();
  e3=add(e1,e2);
  e3.show();
  getch();
}
/* Output */

Enter any string Hello
Enter any string World
string is Hello
string is World
string is HelloWorld

Question:9
Class complex(real,img)
C++ program to declare a class named complex with attributes as real and img. Take input for two complex numbers calculate and display their sum in the given format.
A + i B
A – i B
Real +/- i img
Sol:

Solution In CodeBlocks/DevC++

#include<iostream>
#include<conio.h>
#include<string.h>
using namespace std;
class complex
{
private:
  int real,img;
public:
  void read();
  void show();
  friend complex add(complex c1,complex c2);
};
void complex::read()
{
 cout<<"Enter values of real and img ";
 cin>>real>>img;
}
void  complex::show()
{
  if(img>=0)
  cout<<real<<"  +i  "<<img<<endl;
  else
  cout<<real<<"  -i  "<<img*-1<<endl;
}
complex add(complex c1,complex c2)
{
 complex t;
 t.real=c1.real+c2.real;
 t.img=c1.img+c2.img;
 return(t);
}
int main()
{
  /* clrscr(); */
  complex e1,e2,e3;
  e1.read();e2.read();
  e1.show();e2.show();
  e3=add(e1,e2);
  e3.show();
  getch();
  return(0);
}
/* Output */

Ex:1

Enter values of real and img 5 6
Enter values of real and img 8 9
5  +i  6
8  +i  9
13  +i  15

Ex:2

Enter values of real and img 5 -9
Enter values of real and img 3 -7
5  -i  9
3  -i  7
8  -i  16

Solution In Turboc3

/* this program is developed in turboc3 */
#include<iostream.h>
#include<conio.h>
class complex
{
private:
  int real,img;
public:
  void read();
  void show();
  friend complex add(complex c1,complex c2);
};
void complex::read()
{
 cout<<"Enter values of real and img ";
 cin>>real>>img;
}
//****
void  complex::show()
{
  if(img>=0)
  cout<<real<<"  +i  "<<img<<endl;
  else
  cout<<real<<"  -i  "<<img*-1<<endl;
}
complex add(complex c1,complex c2)
{
 complex t;
 t.real=c1.real+c2.real;
 t.img=c1.img+c2.img;
 return(t);
}
void main()
{
  clrscr();
  complex e1,e2,e3;
  e1.read();e2.read();
  e1.show();e2.show();
  e3=add(e1,e2);
  e3.show();
  getch();
}
/* Output */

Ex:1

Enter values of real and img 5 6
Enter values of real and img 8 9
5  +i  6
8  +i  9
13  +i  15

Ex:2

Enter values of real and img 5 -9
Enter values of real and img 3 -7
5  -i  9
3  -i  7
8  -i  16

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