c++ code not compiling in online compiler?

[thejwal pavithran]

hey guys when i try to run this program, i get the correct output in c free compiler..but when i try to run it onlinein ideone, i get a run time error..please help me guys...

#include<iostream>
#include<stdio.h>
#include<string.h>
#include<ctype.h>
using namespace std;
int main()
{
	int n,i,print_count=0,word_count=0,j,string_length,index,match,different=0;
	char *word; //variable to hold the word to be removed.
	char current_char,first; //current_char holds the letters in the word_array one_by_one
	
	cout<<endl<<"PLEASE ENTER THE WORD TO BE REMOVED FROM WORD_ARRAY"<<endl;
	gets(word);
	
	//cout<<endl<<word;
	//cout<<endl<<strlen(word);
	
	string_length=strlen(word); //length of string to be removed
	first=word[0]; //first holds first char of word
	
	cout<<endl<<"PLEASE ENTER NUMBER OF WORDS IN WORD_ARRAY"<<endl;
	cin>>word_count;
	
	if(word_count<=0) //validates the input
	{
		cout<<endl<<"PLEASE NOTE THAT WORD COUNT SHOULD BE DIGIT GRETAER THAN ZERO";
	}
	else
	{
	
		char word_array[word_count][200]; //if valid input,dynamically create 2D word array
	
		cout<<endl<<"PLEASE ENTER THE WORDS IN THE WORD_ARRAY ONE BY ONE"<<endl;
	
		for(i=0;i<word_count;i++)
		{
			cout<<endl<<"ENTER WORD NUMBER "<<i+1<<">>"<<endl; //read the words into the 2D array
			gets(word_array[i]); 
		}
	
		/*for(i=0;i<word_count;i++)
		{
			cout<<endl<<word_array[i];
		}*/
		//cout<<endl<<"here it goes"<<endl;
		cout<<endl<<endl<<"Output:"<<endl<<endl;
		cout<<"["; //square bracket at beginning of output
	
		for(i=0;i<word_count;i++)   // loop to go through each word of 2d word_array
		{
			cout<<"\""; //double quotes before each word in output
			for(j=0;word_array[i][j]!='\0';) // loop to check the last character of current word 
			{
				different=0;
				current_char=word_array[i][j]; // set current_char
				//cout<<endl<<"current char="<<current_char<<endl;
				if(tolower(current_char)==tolower(first))	 //if there is a first letter match,then only go to letter removal logic
				{
					//cout<<endl<<"first char match"<<endl;
					index=0; // index increments through each letter of 'word' variable. set it to zero,each time ther is a 1st letter match.
					match=0;
					while(index<=(string_length-1)) // loop till index reaches the last character
					{
						if(tolower(word[index])==tolower(word_array[i][j])) //if there is a match in letters,go inside if block
						{
							//cout<<endl<<"hurray";
							index++; //in case of match,make index point to next char of word
							match++; //if a match,increment no of matched chars.
							j++; //in case of match,point to next char of string in word_array
							//cout<<endl<<"match="<<match;
						}
						else
							break; //if no match,get out of loop
					}
					if(match!=string_length) //if the entire word  does not match,move the j index back to the first letter of partially matched word
					{
						//cout<<endl<<endl<<"j="<<j;
						different=1;
						j=j-match;
					}
				}
				
				/***
				A 'different' variable is used here so that even when the word to be removed appears continiously 
				in the input array,it will be removed by the code below.At the same time,it will also print partially 
				matched words.
				***/
			
			//(tolower (word_array[i][j]))!=tolower(first) checks if word which immediately follows the previous word also has to be removed.
			//The condition (different==1) ensures that partially matched words will not be skipped due to the condition tolower (word_array[i][j]))!=tolower(first) 
				if(word_array[i][j]!='\0'&& ((tolower (word_array[i][j]))!=tolower(first) || (different==1))) 
				{
				//cout<<endl<<"not null";
					cout<<word_array[i][j]; //if not a part of given word,print onto screen
					j++; //increment and check next char
				}
			}
			cout<<"\""; //double quotes before each word in output
			//cout<<print_count++;
			if(i<word_count-1)
			cout<<",";
			
			
		}
	
	cout<<"]"; //square bracket at end of output
	}
}

[Campbell Ritchie]

Please supply more details, including the name of the online compiler, in cased we need to avoid it

[thejwal pavithran]

the problem was with using iostream.h where just iostream was needed also i had to use the statement using namespace std...

but now its giving a run time error...some non-standard memory allocation or something like that...the headaches of c++!! i would have implemented the same thing in java..but im still doing simple exercises by taking inputs through command line...im yet to learn how i can take inputs during run time....
by the way the name of the compiler is ideone.com..avoid unless you are using java

[Campbell Ritchie]

I have come across other online IDEs and have known them make errors in Java coding before.

[Campbell Ritchie]

I could get that IDE to work for FORTH, however. That’s better than I have seen before

[thejwal pavithran]

learning java paid off...i dont know if this code below is badly structured or has bad coding practices, but with the little knowledge i had,i was able to achieve the same thing in java..and the online compiler gave up and compiled..

import java.util.Scanner;
 
 class RemoveWord
{
    public static void main(String[] args)
    {
        String subStr; //variable to hold the word to be removed.   
        int numOfWords;
         
         
        Scanner in = new Scanner(System.in);
         
                 
        System.out.println("PLEASE ENTER THE WORD TO BE REMOVED");
        subStr = in.nextLine();
         
         
         
        System.out.println("PLEASE ENTER THE NUMBER OF WORDS IN THE WORD ARRAY");
        numOfWords = in.nextInt();
        //System.out.println(numOfWords);
         
        if(numOfWords > 0) //validates input
        {
                 
            String[] stringCollection = new String[numOfWords];
            String[] finalArray = new String[numOfWords];
         
         
            System.out.println("ENTER THE WORDS ONE BY ONE");
            in.nextLine();
         
         
            for(int i=0; i<numOfWords;i++)
            {
                int k=i+1;
                System.out.println("ENTER WORD NUMBER "+k+" >>>");
                stringCollection[i] = in.nextLine();
            //  System.out.println(i);
            }
         
            finalArray = remove(stringCollection,subStr);
         
            System.out.println("\n\nOUTPUT:");
            System.out.print("["); //square bracket at beginning of output
            for(String s:finalArray)
            {
                System.out.print("\"");
                System.out.print(s+"\",");
            }
             
            System.out.print("]"); //square bracket at end of output
        }
        else
        {
            System.out.println("PLEASE THE ARRAY SIZE SHOULD BE GREATER THAN ZERO");
        }
         
    }
         
         
         
    public static String[] remove(String[] stringCollection,String subStr)
    {
        int finalIndex = 0;
        int index1=0,index2=0;
        String curString;
        String tempString="";
        String[] finalArray = new String[stringCollection.length];
        /*for(int i=0;i<numOfWords;i++)
        {
            System.out.println(stringCollection[i]);
        }*/
         
         
            for(int i=0;i<stringCollection.length;i++)
            {
                 curString = stringCollection[i];
                 tempString = curString;
                while(index1!=-1)
                {
                    index1 = ignoreCase(tempString).indexOf(ignoreCase(subStr)); //checks if substring is present in main string
                    //System.out.println(index1);
                    if(index1 != -1) // if substring present enter if
                    {
                        tempString = curString.substring(0,index1); //copy from beginning till character before substring
                        //System.out.println("yae!");
                        index2 = index1 + subStr.length();
                        tempString = tempString + curString.substring(index2,curString.length()); //copy from character after substring to end of string
                         
                    }
                    curString = tempString; // final string 
                     
                }
                index1 = 0;
                //System.out.println(curString);
                finalArray[finalIndex++] = curString; //add final string to array
             
            }
        /*for(String s:finalArray)
        {
            System.out.println(s);
        }*/
    return finalArray;
    }
     
    public static String ignoreCase(String str) // function to ignore case
    {
        return str.toLowerCase();
    }
}

[Ivan Jozsef Balazs]

This code portion is very suspicious. Where does word point to? How much memory is allocated to that "buffer"?
Where does gets(word) store the line?

char *word; //variable to hold the word to be removed. char current_char,first; //current_char holds the letters in the word_array one_by_one cout<<endl<<"PLEASE ENTER THE WORD TO BE REMOVED FROM WORD_ARRAY"<<endl; gets(word);