#include <bits/stdc++.h>
using namespace std;
 

int versionCompare(string v1,string v2){
  
    // vnum stores each numeric
    // part of version
    int vnum1 = 0, vnum2 = 0;
 
    // loop until both string are
    // processed
    int i = 0, j = 0; 
    while(i < v1.length()|| j < v2.length()) {
        // storing numeric part of
        // version 1 in vnum1
        while (i < v1.length() && v1[i] != '.') {
            vnum1 = vnum1 * 10 + (v1[i] - '0');
            i++;
        }
 
        // storing numeric part of
        // version 2 in vnum2
        while (j < v2.length() && v2[j] != '.') {
            vnum2 = vnum2 * 10 + (v2[j] - '0');
            j++;
        }
 
        if (vnum1 > vnum2)
            return 1;
        if (vnum2 > vnum1)
            return -1;
 
        // if equal, reset variables and
        // go for next numeric part
        vnum1 = vnum2 = 0;
        i++;
        j++;
    }
    return 0;
}

int main()
{
    string version1 = "1.2.8";
    string version2 = "1.8.9";
 
    if (versionCompare(version1, version2) < 0)
        cout << version1 << " is smaller\n";
    else if (versionCompare(version1, version2) > 0)
        cout << version2 << " is smaller\n";
    else
        cout << "Both version are equal\n";
    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
}