#include <iostream>
#include <time.h>
#include <iomanip>
using namespace std;

int main()
{
    srand((unsigned)time(NULL));
    short size;
    short size_positive=0;
    cout << "Enter size of array: ";
    cin >> size;
    
    short** arr = new short*[size];
    short counter = 0;

    for (short i = 0; i < size; i++)
        arr[i] = new short[size];

    cout << "\nThe first array\n";
    for (short i = 0; i < size; i++)
    {
        for (short a = 0; a < size; a++)
        {
            arr[i][a] = -10 + rand() % 14;
            cout << setw(3) << arr[i][a]<<setw(6);
            if (arr[i][a] > 0)
            {
                size_positive++;
            }
        }
        cout << endl;
    }
    
    cout << "\nThe second array\n";
    short* arr_positive = new short[size_positive];
  
    for (short i = 0; i < size; i++)
    {
        for (short a = 0; a < size; a++)
        {
            if (arr[i][a] > 0 && arr[i][a]!=0 /*&& i!=0*/)
            {
                arr_positive[i] = i+1;
 
               /* for (short n = 0; n < size; n++)
                    arr[i-1][a] = -arr[i-1][a]; */         
            }
           //to simple arr
            // cout << setw(3) << arr[i][a] << setw(6);
        }
       // cout<<endl;
    }
   

    for (short k = 0; k < size_positive; k++)
    {
        cout << arr_positive[k] << ";";
    }

    for (short i = 0; i < size; i++)
    {
        delete[] arr[i];
    }
    delete[]arr;
    delete[]arr_positive;
}

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}