Templates in C++ Part – 1

Program 1

// template in C++
#include<iostream>
using namespace std;
template<class T>
class Test
{
    T n;   //string n
   public:
   Test(T m)  //string m
   {
      n=m;
   }
   void show()
   {
      cout<<"Value is: "<<n<<endl;
   }
};
int main()
{
    system("cls");
    Test<int> T1(500);
    Test<string>T2("DataFlair");
    Test<double>T3(90.123);
    Test<char>T4('Z');
    T1.show();
    T2.show();
    T3.show();
    T4.show();
     
    return 0;
}

Program 2

// template in C++
#include<iostream>
using namespace std;
template<class T,class V>
class Test
{
    T x;  
    V y;  

    public:
      Test(T a, V b)
      {
          x=a;
          y=b;
      }
      void show()
      {
          cout<<" First value: "<<x<<endl;
          cout<<" Second value: "<<y<<endl;
      }
};
int main()
{
    system("cls");
    Test<int,double>T1(123,56.77);
    Test<string,int> T2("Vivek",127);
     Test<float,string> T3(123.55,"Dataflair");
     T1.show();
     T2.show();
     T3.show();
    return 0;
}

Program 3

// function template in C++
#include<iostream>
using namespace std;
template<typename T>
void display( T m)  //int , string , double
{
   cout<<"value is: "<<m<<endl;
}
int main()
{
    system("cls"); 
     display(100);  //int
     display("Hello");  //string
     display(123.56); //double
    return 0;
}

Program 4

// function template in C++
#include<iostream>
using namespace std;
template<typename T>
void swapvalue(T &a,T &b)
{
          T c;
         c=a;
         a=b;
         b=c;
       
}
int main()
{
      system("cls");
     int x=500,y=200;
     cout<<"\nBefore swaping: "<<x <<"  "<<y<<endl;
     swapvalue(x,y);
     cout<<"After swaping: "<<x <<"  "<<y;
cout<<"\n---------------------------------------------------------"<<endl;
      double a=50.34,b=20.66;
     cout<<"\nBefore swaping: "<<a <<"  "<<b<<endl;
     swapvalue(a,b);
     cout<<"After swaping: "<<a <<"  "<<b;
 cout<<"\n---------------------------------------------------------"<<endl;

     string m="Hello",n="Friends";
     cout<<"\nBefore swaping: "<<m <<"  "<<n<<endl;
     swapvalue(m,n);
     cout<<"After swaping: "<<m <<"  "<<n;
     return 0;
}