C++ program to find the reverse of Given text.

Source Code:-
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#include<iostream>
using namespace std;
#include<stdio.h>
#include<string.h>

int main()
{
 char str[100],temp;
 int i,j=0;
 cout<<"Enter the string that you want to reverse:";
 gets(str);  //  gets function for input string
 i=0;
 j=strlen(str)-1;
  while(i<j)
   {
   temp=str[i];
   str[i]=str[j];
   str[j]=temp;
   i++;
   j--;
   }
 cout<<" The Reverse string is: "<<str;

}
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Out Put-

C++ Program to get the transpose of given matrix.

Source Code:-
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#include <iostream>
using namespace std;

int main()
{
    int a[10][10], trans[10][10], r, c, i, j;

    cout << "Enter rows and columns of matrix: ";
    cin >> r >> c;

    // Storing element of matrix entered by user in array a[][].
    cout << endl << "Enter elements of matrix: " << endl;
    for(i = 0; i < r; ++i)
    for(j = 0; j < c; ++j)
    {
        cout << "Enter elements a" << i + 1 << j + 1 << ": ";
        cin >> a[i][j];
    }

    // Displaying the matrix a[][]
    cout << endl << "Entered Matrix: " << endl;
    for(i = 0; i < r; ++i)
        for(j = 0; j < c; ++j)
        {
            cout << " " << a[i][j];
            if(j == c - 1)
                cout << endl << endl;
        }

    // Finding transpose of matrix a[][] and storing it in array trans[][].
    for(i = 0; i < r; ++i)
        for(j = 0; j < c; ++j)
        {
            trans[j][i]=a[i][j];
        }

    // Displaying the transpose,i.e, Displaying array trans[][].
    cout << endl << "Transpose of Matrix: " << endl;
    for(i = 0; i < c; ++i)
        for(j = 0; j < r; ++j)
        {
            cout << " " << trans[i][j];
            if(j == r - 1)
                cout << endl << endl;
        }

    return 0;
}
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Out Put:-

 

C++ program to add given two matrix

Source Code:-
#include <iostream>
using namespace std;

int main()
{
    int r, c, a[100][100], b[100][100], sum[100][100], i, j;

    cout << "Enter number of rows (between 1 and 100): ";
    cin >> r;

    cout << "Enter number of columns (between 1 and 100): ";
    cin >> c;

    cout << endl << "Enter elements of 1st matrix: " << endl;

    // Storing elements of first matrix entered by user.
    for(i = 0; i < r; ++i)
       for(j = 0; j < c; ++j)
       {
           cout << "Enter element a" << i + 1 << j + 1 << " : ";
           cin >> a[i][j];
       }

    // Storing elements of second matrix entered by user.
    cout << endl << "Enter elements of 2nd matrix: " << endl;
    for(i = 0; i < r; ++i)
       for(j = 0; j < c; ++j)
       {
           cout << "Enter element b" << i + 1 << j + 1 << " : ";
           cin >> b[i][j];
       }

    // Adding Two matrices
    for(i = 0; i < r; ++i)
        for(j = 0; j < c; ++j)
            sum[i][j] = a[i][j] + b[i][j];

    // Displaying the resultant sum matrix.
    cout << endl << "Sum of two matrix is: " << endl;
    for(i = 0; i < r; ++i)
        for(j = 0; j < c; ++j)
        {
            cout << sum[i][j] << "  ";
            if(j == c - 1)
                cout << endl;
        }

    return 0;
}

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Output:

 

C++ Program To Multiply two matrix.

Source Code:-
#include <iostream>
using namespace std;

int main()
{
    int a[10][10], b[10][10], mult[10][10], r1, c1, r2, c2, i, j, k;

    cout << "Enter rows and columns for first matrix: ";
    cin >> r1 >> c1;
    cout << "Enter rows and columns for second matrix: ";
    cin >> r2 >> c2;

    // If column of first matrix in not equal to row of second matrix,
    // ask the user to enter the size of matrix again.
    while (c1!=r2)
    {
        cout << "Error! column of first matrix not equal to row of second.";

        cout << "Enter rows and columns for first matrix: ";
        cin >> r1 >> c1;

        cout << "Enter rows and columns for second matrix: ";
        cin >> r2 >> c2;
    }

    // Storing elements of first matrix.
    cout << endl << "Enter elements of matrix 1:" << endl;
    for(i = 0; i < r1; ++i)
        for(j = 0; j < c1; ++j)
        {
            cout << "Enter element a" << i + 1 << j + 1 << " : ";
            cin >> a[i][j];
        }

    // Storing elements of second matrix.
    cout << endl << "Enter elements of matrix 2:" << endl;
    for(i = 0; i < r2; ++i)
        for(j = 0; j < c2; ++j)
        {
            cout << "Enter element b" << i + 1 << j + 1 << " : ";
            cin >> b[i][j];
        }

    // Initializing elements of matrix mult to 0.
    for(i = 0; i < r1; ++i)
        for(j = 0; j < c2; ++j)
        {
            mult[i][j]=0;
        }

    // Multiplying matrix a and b and storing in array mult.
    for(i = 0; i < r1; ++i)
        for(j = 0; j < c2; ++j)
            for(k = 0; k < c1; ++k)
            {
                mult[i][j] += a[i][k] * b[k][j];
            }

    // Displaying the multiplication of two matrix.
    cout << endl << "Output Matrix: " << endl;
    for(i = 0; i < r1; ++i)
    for(j = 0; j < c2; ++j)
    {
        cout << " " << mult[i][j];
        if(j == c2-1)
            cout << endl;
    }

    return 0;
}
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Output:-

C++ program to get a list of leap year from 1996 to 2000.( Or years in a range)

Source Code:- 

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#include<iostream>
using namespace std;
int main()
{
    int a,n,i,k=0;
    cout<<"\"This program will show Leap Years between a range. \""<<endl<<endl;
    cout<<"What is the starting year ?. Give a starting year. "<<endl;     cin>>a;
    cout<<"What is the ending year ?. Give a ending year. "<<endl;     cin>>n;
    cout<<endl;
    cout<<"Leap Years between "<<a<< " to "<<n<<" are :"<<endl;

    for(i=a;i<=n;i++)
        if(((i%400==0) || (i%100 !=0)) && ( i%4==0)) 
        {
            cout<<i<<" ";
            k++;
        }

    if(k==0) 
    {
        cout<<0<<endl;
        cout<<"It means there is no leapyears between "<<a<<" to "<<n;
    }
}

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Output: