#include <iostream>
using namespace std;
int counter =0;
void PrintMatrix(int arr[][10],int k,int p,int row,int col)
{
  int sum = 0;
  for(int i=k;i<k+row;i++)
  {
    for(int j=p;j<p+col;j++)
    {
      cout<<arr[i][j]<<" ";
      sum += arr[i][j];
    }
  }
  cout<<"\n";
  if(sum%4==0){
    cout<<"mela paar sum divisible by 4"<<"\n";
    counter+=1;
  }
}

int main() 
{
   int arr[][10] = { { 5, -1, 6 },
                        { -2, 3, 8 },
                        { 7, 4, -9 } };
    int n=3;
    int m=3;
    for (int i = 1; i <= n; ++i)
  {
    for (int j = 1; j <= m; ++j)
    {
      cout<<i<<"X"<<j<<"\n";
      // we are at each sub matrix of size(i,j)
      for (int k = 0; k <= (n - i); ++k)
      {
        for (int p = 0; p <= (m - j); ++p)
        {
          PrintMatrix(arr,k,p,i,j);
        }
        cout<<"\n";
      }
      cout<<"\n";
    }
    
  }
    cout<<counter;
    return 0;
}
by

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
}