#include <iostream>
using namespace std;

void sumOfTwoArrays(int *input1, int size1, int *input2, int size2, int *output)
{
  int n=max(size1, size2);
  int i=size1-1;
  int j=size2-1;
  int carry=0;
  
  while(i>=0 && j>=0) {
    int sum=input1[i--]+input2[j--]+carry;
    output[n--]=sum%10;
    carry=sum/10;
  }
  
  while(i>=0) {
    int sum=input1[i--]+carry;
    output[n--]=sum%10;
    carry=sum/10;
  }
  
  while(j>=0) {
    int sum=input2[j--]+carry;
    output[n--]=sum%10;
    carry=sum/10;
  }
  
  if(n>=0) {
    output[n--]=carry;
  }
}

int main()
{
	int t;
	cin >> t;

	while (t--)
	{
		int size1;
		cin >> size1;

		int *input1 = new int[size1];

		for (int i = 0; i < size1; ++i)
		{
			cin >> input1[i];
		}

		int size2;
		cin >> size2;

		int *input2 = new int[size2];

		for (int i = 0; i < size2; ++i)
		{
			cin >> input2[i];
		}

		int outsize = 1 + max(size1, size2);

		int *output = new int[outsize];

		sumOfTwoArrays(input1, size1, input2, size2, output);

		for (int i = 0; i < outsize; ++i)
		{
			cout << output[i] << " ";
		}

		delete[] input1;
		delete[] input2;
		delete[] output;
		cout << endl;
	}

	return 0;
}
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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
}