C++ Data Types Part – 1

Program 1

include<iostream>
using namespace std;
int main()
{
    string name="Vivek";
    system("cls");
    
    cout<<a;
    
    //cout<<name.length();
    

    // unsigned short a;
    // a=65535;
    // a=a+1;
    // system("cls");
    // //cout<<sizeof(a);
    // cout<<a;
    return 0;
}

Program 2

#include<iostream>
using namespace std;
int main()
{
     int a,b;
     system("cls");
     cout<<"Enter two number";
     cin>>a>>b;
     cout<<"\nBefore Swaping: "<<a<<"  "<<b;  // a=50  b =20
     a=a+b;  // a=70
     b=a-b;  // b=50
     a=a-b;  //a=20
    //   c=a;
    //   a=b;
    //   b=c;
     cout<<"\nAfter Swaping: "<<a<<"  "<<b;
     
    //  cout<<"\nAddition is: "<<a+b;
    //  cout<<"\nSubtraction is: "<<a-b;
    //  cout<<"\nDivision is: "<<a*b;;
    //  cout<<"\nMultiplication is: "<<a/b;
     return 0;
}

Program 3

#include<iostream>
using namespace std;
int main()
{
    system("cls");
    float a,r;
    const float PI=3.14f;
    cout<<"Enter redious";
    cin>>r;
    a=PI*r*r;
    cout<<"Area is :"<<a;
     return 0;
}

Program 4

// Marksheet program
#include<iostream>
using namespace std;
int main()
{
    int h,e,m,c,total;   
    float per;
    system("cls");
    cout<<"\n Enter marks of hindi";
    cin>>h;
    cout<<"\n Enter marks of english";
    cin>>e;
    cout<<"\n Enter marks of maths";
    cin>>m;
    cout<<"\n Enter marks of computer";
    cin>>c;
    total=h+e+m+c;
    per=(total/4.0);
    cout<<"\n Total Marks: "<<total;
    cout<<"\n Percentage: "<<per;
    return 0;
}