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C++ Program to find Keywords of any C++ program

#include <iostream>
#include<fstream>
#include<string.h>
#include<ctype.h>
using namespace std;

char keywords[] = "int char string int double return auto breka; case const continue default do long register short signed sizeof static struct switch typedef union unsigned void volatile while double else enum extern  float for goto if";
char keywordList[100];
unsigned int keywordCounter = 0;
void keywordChecker(char **);

int main()
{
    memset(keywordList, NULL, sizeof(keywordList));	
    
    string line;
    
    /*input.txt has some c++ program*/
    ifstream myinputdocumnt("input.txt");
    
    /*output.txt will have uncommented code from input.txt and also prints Keyword List */
    
    ofstream myoutputdocumnt("output.txt");
    int c=0;
        if(myinputdocumnt.is_open()){
        while(getline(myinputdocumnt,line)){
            char* newline=new char[line.length()+1];
            strcpy(newline,line.c_str());
            for(int i=0;i2)   {
			strcat(keywordList, p);
			strcat(keywordList, " ");
			keywordCounter++;
		}
		p = strtok(NULL, *ptr);
	}
}