ATL / WTL / STL

include <iostream>
using namespace std;

class matrix{
    int **p;    //pointer to Matrix
    int d1, d2;

public:
    //matrix(){}                  //default constructor
    matrix(int x=20, int y=20);       //parameterised

    void get_element();
    void put_element();
    int checkAdd(matrix &);                                     //to check the feasibility of the operation

    //Rule of three
    matrix operator + (matrix &);
    void operator = (matrix );

    ~matrix(){
        for (int i = 0; i < d1; i++)
            delete p[i];
        delete p;
    }
};

matrix temp;                    //global matrix temp

//=============================================

void matrix::operator = (matrix obj){

    this->d1 = obj.d1;
    this->d2 = obj.d2;
    for(int i=0; i<d1; i++)
        for(int j=0; j<d2; j++)
            this->p[i][j] = obj.p[i][j];

    //put_element();
    //return(*this);
}

matrix matrix::operator+(matrix &obj){
    if(checkAdd(obj)==0)
    {
        //matrix temp;
        for(int i=0; i<obj.d1; i++)
            for(int j=0; j<obj.d2; j++)
                temp.p[i][j] = this->p[i][j] + obj.p[i][j];


        //temp.put_element();
        return(temp) ;
    }

    cout<<"coloumn and rows of both matrix are not equal !"<<endl;
    return (*this);
}

matrix ::matrix(int x, int y)
{
    d1 = x;
    d2 = y;
    p = new int *[d1];                  //creates an array of pointers

    for(int i=0; i<d1; i++)
        p[i] = new int [d2];            //creates row for each row
}

int matrix::checkAdd(matrix &obj){
    if((this->d1 == obj.d1) && (this->d2 == obj.d2))
        return 0;
    else return 1;
}

void matrix::get_element(){
    for(int i=0; i<d1; i++)
        for(int j=0; j<d2; j++){
            cout<<"m["<<i<<"]["<<j<<"] = ";
            cin>>p[i][j];
        }
    //cout<<"Following is your Matrix : \n\n";
    //put_element();
}

void matrix::put_element(){
    cout<<"\n\n";
    for(int i=0; i<d1; i++){
        for(int j=0; j<d2; j++){
            cout<<p[i][j]<<"\t";
        }
        cout<<endl;
    }

}

//=============================================

int main(){
    matrix A(3, 2), B(3, 2), C;                     //matrix objects a constucted

    cout<<"Enter matrix elements row by row \n\n";
    A.get_element();
    A.put_element();

    B.get_element();
    B.put_element();

    C = A + B;
    cout<<"\n\n";
    C.put_element();

    return 0;
}

#include <stdio.h>

int main()
{
    char name[10][30], ch;
    int i;

    for(i=0; i<10; i++)
    {
        printf("Enter name: \n");

        int j=0;
        while(ch != '\n')
        {
            ch = getchar();
            name[i][j] = ch;
            j++;
        }
        name[i][j] = '\0';

    }

    return 0;
}

<pre>#include <stdio.h>

int main()
{
	int i, num[10];
	int *p;
	p = &num[0];
	
	for(i=0; i<=10; i++)
	{
		(p+i) = i;
		printf("\n%d", *(p+i));
	}
	
	
	return 0;
}

#include <stdio.h>

int final_array(int arr[], int size, int k, int i);
void array(int arr[], int i, int size);

int main()
{
	int num, size[100];
	int i, j, k=0;
	int arr[100][100];

	printf("Enter the number of arrays: \t");
	scanf("%d", &num);
	num = num < 100 ? num: 100;
	//feeding elements.
	for (i = 0; i<num; i++)
	{
		printf("\nEnter the size of the array: \t");
		scanf("%d", &size[i]);

		printf("\nEnter the array: ");
		//int arr[i][size[i+1]];
		size[i] = size[i] < 100 ? size[i] : 100;
		array(&arr[i][0], i, size[i]);
	}

	for(i=0; i<num; i++)
    {
        final_array(&arr[i][0], size[i], k, i);
        printf("\n");
    }

	printf("\nPress Enter key to exit.\n");
	getchar();

	return 0;
}

void array(int arr[], int i, int size)
{
	int j;
	for (j = 0; j<size; j++)
	{
		printf("\nEnter arr[%d][%d]: \t",i, j);
		scanf("%d", &arr[j]);
	}
}

int final_array(int arr[], int size, int k, int i)
{
    if(k<=size)
    {
        printf("%d", arr[k]);
        final_array(&arr[i][0], size[i], k++, i);
    }
    else
        return 0;


    /*
    int j;
    for(j=0; j<size; j++)
    {
    	printf("%d\t", arr[j]);
	}
	*/
}