#include "Parser.h"
#include <iostream>
#include <string>
#include <cctype>
using namespace std;

Parser::Parser(string input)
{
    count_a = 0;
    count_b = 0;
    count_c = 0;
    count_d = 0;
    count_e = 0;
    count_f = 0;
    count_g = 0;
    count_h = 0;
    count_i = 0;
    count_j = 0;
    count_k = 0;
    count_l = 0;
    count_m = 0;
    count_n = 0;
    count_o = 0;
    count_p = 0;
    count_q = 0;
    count_r = 0;
    count_s = 0;
    count_t = 0;
    count_u = 0;
    count_v = 0;
    count_w = 0;
    count_x = 0;
    count_y = 0;
    count_z = 0;
    count_non = 0; 
    count_pairs = 0;
    count_total = 0;
    in = input;

}

int Parser::Switch()
{
    for (int i = 0; i < in.length(); ++i)
    {
        char extract = in[i];
        extract = tolower(extract);
        if((isalpha(extract) && (i != in.length()-1)))
        {
            if(extract == in[i + 1])
            {
                ++count_pairs;
            }
        }

        switch (extract)
            {
            case 'a':
                ++count_a;
                break;
            case 'b':
                ++count_b;
                break;
            case 'c':
                ++count_c;
                break;
            case 'd':
                ++count_d;
                break;
            case 'e':
                ++count_e;
                break;
            case 'f':
                ++count_f;
                break;
            case 'g':
                ++count_g;
                break;
            case 'h':
                ++count_h;
                break;
            case 'i':
                ++count_i;
                break;
            case 'j':
                ++count_j;
                break;
            case 'k':
                ++count_k;
                break;
            case 'l':
                ++count_l;
                break;
            case 'm':
                ++count_m;
                break;
            case 'n':
                ++count_n;
                break;
            case 'o':
                ++count_o;
                break;
            case 'p':
                ++count_p;
                break;
            case 'q':
                ++count_q;
                break;
            case 'r':
                ++count_r;
                break;
            case 's':
                ++count_s;
                break;
            case 't':
                ++count_t;
                break;
            case 'u':
                ++count_u;
                break;
            case 'v':
                ++count_v;
                break;
            case 'w':
                ++count_w;
                break;
            case 'x':
                ++count_x;
                break;
            case 'y':
                ++count_y;
                break;
            case 'z':
                ++count_z;
                break;
            default:
                ++count_non;
                break;
            }
    }

    return 1;
} 

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
}