#include <stdio.h>
#include <stdlib.h>


void merge(int arr[],int i,int j){
  
  
  
  
  int temp[j-i+1];
  if(j-i==0){
    return;
  }
  
  merge(arr,i,(i+j)/2);
  merge(arr,(i+j)/2+1,j);
  
  int x = (i+j)/2;
  int y= j;
  int m= i;
  int n= x+1;
  int k=0;
  
  while(m<=x || n<=y){
    
    if(m<=x && n<=y){
      
      if(arr[m]<arr[n]){
        temp[k]=arr[m];
        m++;
        k++;
        continue;
        
      }else{
        
         temp[k]=arr[n];
        n++;
        k++;
        continue;
       
        
      }
      
      
    }
    
    if(m<=x){
      
      
       temp[k]=arr[m];
        m++;
        k++;
        continue;
       
    }
    
    temp[k]=arr[n];
        n++;
        k++;
        continue;
       
    
    
    
  }
  
  n=i;
  for(m=0;m<k;m++){
    arr[n]= temp[m];
    n++;
    
  }
  
  
  
  
  
}




int main(){
int n,i;
printf("Enter the number of integers\n");
scanf("%d",&n);

int arr[n];

printf("Enter the array\n");
for(i=0;i<n;i++ ){
scanf("%d",&arr[i]);

}

 merge(arr,0,n-1);

printf("Array is \n");
for(i=0;i<n;i++ ){
printf("%d ",arr[i]);

}



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
}