Learn C++ (Introduction and Tutorials to C++ Programming)

//Program to check whether given string is palindrome or not

#include<iostream.h>

#include<conio.h>

#include<stdio.h>

  void main()

  {clrscr();

  char str[30];

  int i,j,len,flag;

  cout<<"\n Enter The String :";

  gets (str);

  for(len=0; str [len]!='\0';++len);

  cout<<"\n The Length of The String ="<<len;

  for(i=0, j=len-1; i<len/2;i++,j--)

  {if(str[i]!= str[j])

  {flag =1;

  cout <<"\n NOT A PALINDROME";

  break;

  }

 }

 if(flag==0)

 cout<<"\n YES A PALINDROME";

 getch();

}

C++ is a general-purpose programming language. It has imperative, object-oriented and generic programming features, while also providing facilities for low-level memory manipulation. C++ is one of the most popular programming languages. It is based on C but is an object-oriented programming language. It is widely used in graphics libraries, games, network devices, etc.

//Program to find the length of a string without using library function

#include<iostream.h>

#include<conio.h>

#include<stdio.h>

 void main()

 {clrscr();

 char str[30];

 int len;

 cout<<"\n Enter a String :";

 gets(str);

 for(len=0;str(len)!='\0';++len);

 cout<<"\n The Length of The String="<<len;

 getch();

 }

//Program to find the transpose of m*n Matrix

#include<iostream.h>

#include<conio.h>

 void main()

 {clrscr();

 int A[10][10],B[10][10],m,n,i,j;

 cout<<"\n  Enter The No. of rows :";

 cin>>m;

 cout<<"\n Enter The No. of columns :";

 cin>>n;

 for(i=0; i<m;i++)

 {for(j=0; j<n;j++)

 {cout<<"\n Enter A["<<i<<"]["<<j<<"] element :";

 cin>>A[i][j];

  }

 }

 cout<<"\n The Matrix is :";

 for(i=0;i<m;i++)

 {cout<<"\n";

 for(j=0;j<n;j++)

 cout<<A[i][j]<<" ";

}

 for(i=0;i<n;i++)

{for(j=0;j<m;j++)

 B[i][j]=A[j][i];

 }

 cout<<"\n The Transpose Matrix Is :";

 for(i=0;i<n;i++)

 {cout<<"\n";

 for(j=0;j<m;j++)

 cout<<B[i][j] <<"";

 }

 getch();

 }

//Program to find the sum of two matrices

#include<iostream.h>

#include<conio.h>

void main()

{

 clrscr();

 int A[10][10],B[10][10],C[10][10],m,n,p,q,i,j;

 cout<<"\n enter the no of rows for A:";

 cin>>m;

 cout<<"\n enter the no of columns for A:";

 cin>>n;

 cout<<"\n enter the no of rows for B:";

 cin>>p;

 cout<<"\n enter the no of columns for B:";

 cin>>q;

 if(m==p && n==q)

 {

  for(i=0;i<m;i++)

  {

   for(j=0;j<n;j++)

   {cout<<"\n enter A["<<i<<"]["<<j<<"] elements:";

    cin>>A[i][j];

   }

  }

 cout<<"\n the matrix A is:";

 for(i=0;i<m;i++)

 {

  cout<<"\n";

  for(j=0;j<n;j++)

  cout<<A[i][j]<<" ";

 }

 for(i=0;i<p;i++)

 {

  for(j=0;j<q;j++)

  {

  cout<<"\n enter B["<<i<<"]["<<j<<"] elements:";

  cin>>B[i][j];

  }

 }

 cout<<"\n the matrix B is:";

 for(i=0;i<p;i++)

 {

  cout<<"\n";

  for(j=0;j<q;j++)

  cout<<B[i][j]<<" ";

 }

 for(i=0;i<m;i++)

 {

  for(j=0;j<n;j++)

  C[i][j]=A[i][j]+B[i][j];

 }

  cout<<"\n the sum of the two is:";

  for(i=0;i<m;i++)

  {

   cout<<"\n";

   for(j=0;j<n;j++)

   cout<<C[i][j]<<" ";

  }

 }

  else

  {

   cout<<"\n the two are not equal and hence not be added:";

   }

 getch();

}

//Program to sort an Integer Array in descending order

#include <iostream.h>

#include <conio.h>

void main()

{clrscr();

int n,i,j,B[10],temp ;

cout <<"\n enter the number of element :";

cin>>n;

for (i=0; i<n ; i++)

{cout <<"\n enter B["<<i<<"] element :";

cin>>B[i];

}

cout <<"\n original array :";

for (j=0; j<n; j++)

cout <<"\n B["<<j<<"]="<<B[j];

for(i=0;i<n; i++)

{for(j=0;j<n-i-1; j++)

{if(B[j] <B[j+1])

{temp=B[i];

B[j]=B[j+1];

B[j+1]=temp;

  }

 }

}

cout<<"\n decending order of array is :";

for(j=0;j<n;j++)

cout<< B[j]<<">";

getch();

}

//Program to find the Sum of Series

#include<iostream.h>

#include<stdio.h>

#include<conio.h>

void main()

{clrscr();

float x,sum,term,fact=1;

int i,n;

cout<<"\n enter the value of x and n:";

cin>>x>>n;

sum=1;term=1;

for(i=1;i<=n;i++)

{fact=fact*i;

term=term+(x/fact);

sum=sum+term;

}cout<<"\n sum of the series="<<sum;

getch();

}

Or

#include <iostream.h>

#include <conio.h>

#include <math.h>

void main()

{clrscr();

  long x,n,i,sum=0,term;

  cout<<"\n enter the x:";

  cin>>x;

  cout<<"\n enter the n:";

  cin>>n;

for(i=1;i<=n;i++)

 {

  term=pow(x,i);

  sum=sum+term;

 }

  cout<<"\n enter the sum="<<sum;

 getch();


 }

//Program to Calculate Area of Circle, a Rectangle or a Square

#include<iostream.h>

#include<conio.h>

#include<math.h>

void main()

{clrscr();

int r,L,B,s;

int ch;

 float area;

       cout<<"\n press 1 for circle";

       cout<<"\n press 2 for rectangle";

       cout<<"\n press 3 for square";

       cout<<"\n enter your choice :";

       cin>>ch;

 switch(ch)

{case 1:cout<<"\n enter the radius:";

 area=3.14*r*r;

 cout<<"\n"<<"the area of the circle is"<<area<<"\n";

 break;

 case 2:cout<<"\n enter length and breadth of rectangle:";

 cin>>L>>B;

 area=L*B;

 cout<<"\n"<<"the area of rectangle is"<<area<<"\n";

 break;

 case 3:cout<<"\n enter the sides of square:";

 cin>>s;

 area=(s*s);

 cout<<"\n"<<"the area of the square is"<<area<<"\n";

 break;

 default:cout<<"\n wrong choice entered";

}

getch();

}