Pyramid - Using Nested For Loop

#include<iostream.h>
main()
{
   for(int i=0;i<3;i++)
{
for(int j=0;j<=i;j++)
cout<<" "<<j;
cout<<endl;
}
}


Output:

Switch Case- Simple Program

#include<iostream>   //programmarsarmy.blogspot.com
using namespace std;
main(){
int n;
cout<<"Enter any number between 1-6:";
cin>>n;
cout<<"You entered:"<<n<<endl;
cout<<"Name of Students\n"
    <<"================\n"
    <<" 1- Usaid\n 2- Rahim\n 3- Rida\n 4- Aysha\n 5- Jannat\n 6- Imtiaz"
    <<"\n================"<<endl<<endl;
  if(n>0&&n<=10)
 
 switch(n)
{
 case 1:
        cout<<n<<"= usaid "<<endl;
        cout<<"================"<<endl;
break;
 case 2:
        cout<<n<<"= rahim"<<endl;
        cout<<"================"<<endl;
break;
 case 3:
        cout<<n<<"= rida "<<endl;
        cout<<"================"<<endl;
break;
 case 4:
        cout<<n<<"= ayesha "<<endl;
        cout<<"================"<<endl;
break;
 case 5:
       cout<<n<<"= Jannat "<<endl;
        cout<<"================"<<endl;
break;
 case 6:
        cout<<n<<"= Imtiaz "<<endl;
        cout<<"================"<<endl;
break;
}

}

Output:

Calculator Using Else if Statement - C++

#include <iostream>
using namespace std;
main()
{
    int number1,number2;
 char op;
    int answer, answer1, answer2, answer3;

    cout << "Enter value of number1: ";
    cin >> number1;

    cout << "Chose your Operator:";
 cout<<"Press1 for +, press2 for -, press3 for *, press4 for/"<<endl;
    cin >> op;

    cout << "Enter value of number2: ";
    cin >> number2;

    if (op == '1')
   {answer = number1 + number2;
   cout << "Answer: " << answer << endl;}
   
   else if (op == '2')
   {answer1 = number1 - number2;
   cout << "Answer: " << answer1 << endl;}
         
    else if(op == '3')
    {answer2 = number1 * number2;
    cout <<  "Answer: " << answer2 << endl;}
    
    else if (op == '4')
    {answer3 = number1 / number2;
     cout << "Answer: " << answer3 << endl;}
                
    return 0;
}

Output:

Nested If Statement+Logic Gates- Using C++

//Question is:
/*if gender is male and grade is 70 and above,display "goodboy";

if gender is female and grade is 70 above, display "goodgirl";

but if grade is below 70 regardless of gender,display "badchild";  */

//Source Code:

#include<iostream>

using namespace std;

main()

{

int grade;

char gender;

cout<<"Gender Is:";

cin>>gender;

cout<<"Grade Is:";

cin>>grade;

if(gender =='M'||'m')

if(grade>=70)

cout<<"goodboy";

if(gender=='F'||'f')

if(grade>=70)

cout<<"\n goodgirl";

else

cout<<"\n badchild";

return 0;

}

Output:

While Loop Basic Program1- Using C++

#include<iostream>
using namespace std;
int main()
{

int n=99; // make sure n isnot initiallized to 0

while(n!=0)   //loop until n is 0
cin>>n;       // read a number into n
cout<<endl;
return 0;
}
Output:

While Loop- Basic Program- Using C++

#include<iostream>
using namespace std;

 int main()
{
int a=10;

while(a<20)
{
cout<<"value of a:" <<a <<endl;
a++;
}
}

Output:

Compare Two Values- Relational Operators- Using C++

#include<iostream>     // Including Header File
using namespace std;  // C++ Program Standard
int main()                              
{
   int num;  // variable declaration
   cout<<"Enter a number:";               // print enter a number :
   cin>>num;                           // run time user input
 
   cout<<"num < 10 is = "<< (num < 10) <<endl;    // comparing no' s
   cout<<"num > 10 is = "<< (num > 10) <<endl;    // comparing no' s
   cout<<"num == 10 is = "<< (num == 10) <<endl;  //comparing  no' s
 
}

Output:

For loop Basic Program- Using C++

#include<iostream>
using namespace std;
int main()
{
int i;

for (i = 0; i < 10; i++)
{
cout << "Hello" << "\n";
cout << "There" << "\n";
}
return 0;
}

Output:

For Loop- Counter Program- Using C++

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

int main()
{

     // Variable Declaration
     int a;

     // Get Input Value
     cout<<"Enter the Number :";
     cin>>a;

     //for Loop Block
     for (int counter = 1; counter <= a; counter++)
     {
         cout<<"Execute "<<counter<<" time"<<endl;
     }

     // Wait For Output Screen
     getch();
     return 0;
 }

Output:

Factorial Using C++

#include<iostream>
using namespace std;
int main()
{
    int num,factorial=1;

    cout<<" Enter Number To Find Its Factorial:  ";

    cin>>num;

    for(int a=1;a<=num;a++)

    {

        factorial=factorial*a;

    }
cout<<"Factorial of Given Number is ="<<factorial<<endl;
    return 0;
}

Output:

Representation of a Linked List In a Memory

#include<iostream>
using namespace std;
struct node
{
   int data;
   node *link;
};
node *head;

main()
{ head= new node;
 head->data=405;
 head->link=NULL;
 cout<<"The Value in the starting node= "<<head->data<<endl;}

Output:

Array Using C++

Array: An array is a variable that holds multiple values of the same type.
Arrays and pointers have a special relationship as arrays use pointers to reference memory locations. Syntax is :

datatype arrayname[array size];

#include <iostream.h>   
#include <iomanip.h>   //we use this header file for set w OR Width 

main()
{
   int arr[ 10 ]; // its an integer type array of size 10

/*initialize elements of (array) i.e start with 0 and n-1 means 0to9         
  for sum using for loop*/
  
   for ( int i = 0; i < 10; i++ )
   {
     arr[ i ] = i + 100;
   // i.e calculation 100 =0 + 100 to 109= 9+100
   }
   
cout << "Array Members" << setw( 12 ) << "Values" << endl;

   // again for loop for output/ display                      

   for ( int j = 0; j < 10; j++ )
   {
      cout << setw( 6 )<< j << setw( 17 ) << arr[ j ] << endl;
   }

   return 0;

}

Output:

Pointers Using C++ Program 1

//Pointers: A pointer is a variable that contains the address of a variable.

#include<iostream>
using namespace std;
main()
{
int x=100;   // initialize integer type variable name x
int *y;     // declare integer type pointer y

    cout<<x;  // print value of integer type variable x
    cout<<"\n";  // new line

  y=&x;        // giving address of variable x to y
*y=5000;    // without accessing x changing value of x=100 to 5000

cout<<x;     // after, poiting now, value of x is : 5000
cout<<"\n";  // new line

int **z;     // declare integer type pointer to pointer c
z=&y;        // giving address of y to z
**z=90;     // now, without disturbing x&y value of x is 90
cout<<x;    //value of x is 90

}

Output:

Nested For Loop Using C++ Program(2)

#include<iostream>  
using namespace std;
main()   
{

for(int i=1;i<5;i++)      
    {
cout<<i<<"\t";
for(int j=1;j<5;j++)  
cout<<j;
cout<<"\n";
  }
}

// پہلا لوپ ایک بار چلے گا تو دوسرا والا لوپ 4  بار چلے گا اور پھر پہلا والا لوپ دوسری بار چلے گا تو دوسرا 

//لوپ 4 بار چلے گا پھر اسی طرح چار بار پہلا لوپ چلے گا   

OutPut:

Fabonacci series Using C++

#include<iostream>          // header file
using namespace std;
main()                      // simple main function
{
  //variable declaration
int number, firstvalue = 0, secondvalue = 1, next ;

// simple programming of cout
   cout<<"Enter the number of terms:\a";
   cin>>number;
   cout<<"-------------------------------------\n"<<endl;
   cout<<"Fabonacci series of "<<number<<"is:\n";
   cout<<"-------------------------------------\n"<<endl;


   for (int i=0;i<number;i++)
   {
      if(i<=1)
      next = i;
      else
      {
  next = firstvalue + secondvalue;
  firstvalue = secondvalue;
  secondvalue = next;
      }
      cout<<next<<"\t";
   
   }
cout<<"\n\n \a";
   }
 

 //  fb: programmarsarmy.blogspot.com
   
OutPut:

00- How to print any message using c++ ?

#include<iostream>     // including header file                                    
using namespace std;

main()       // simple main function
{

cout<<"Hamdard University " <<endl;      // print Hamdard University

}  
 // Name: Osaid Jamal

  Output:
  ======