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C++ Program to Delete a Word from a String

In this article, you will learn and get code to delete (or remove) a word from a string in C++. Both words and strings must be entered by the user at runtime.

Here is the list of programs you will go through:

The first program has the limitation that if the user enters the string this is fresherearth and the word to delete as is. Then is from this also gets deleted. So the new string will be th fresherearth. To overcome this problem, we've modified this program.

The second program (the modified program) also removes extra spaces from the new string.

Delete a word from a string

To delete any desired word from a given string in C++ programming, you have to ask the user to enter the string and word. Then delete the entered word (along with its duplicate) from the entered string.

The question is, "Write a program in C++ that deletes a word from a string." Here is its answer:

#include<iostream>
#include<stdio.h>
#include<string.h>
using namespace std;
int main()
{
    char str[200], wrd[20];
    int i, j, strLen, wrdLen, tmp, chk=0;
    cout<<"Enter the String: ";
    gets(str);
    cout<<"Enter the Word: ";
    cin>>wrd;
    strLen = strlen(str);
    wrdLen = strlen(wrd);
    for(i=0; i<strLen; i++)
    {
        tmp = i;
        for(j=0; j<wrdLen; j++)
        {
            if(str[i]==wrd[j])
                i++;
        }
        chk = i-tmp;
        if(chk==wrdLen)
        {
            i = tmp;
            for(j=i; j<(strLen-wrdLen); j++)
                str[j] = str[j+wrdLen];
            strLen = strLen-wrdLen;
            str[j]='\0';
        }
    }
    cout<<"\nNew String = "<<str;
    cout<<endl;
    return 0;
}

This program was built and runs under the Code::Blocks IDE. Here is its sample run:

C++ program to delete word from string sentence

Now supply any string, say Hello from C++, Hello from fresherearth and a word say Hello. Press the ENTER key to delete Hello from the entered string as shown in the snapshot given below:

delete word from string c++

The following is the dry run of the above program with user input as provided in the above sample run:

Note: If you want to create the same program without using strlen(), then you can refer to Count Occurrence of a Word in a String. I know the program is not the same, but that article is a little similar to this one. Without using any string functions, we counted the desired word from the string.So you can refer to that article as an idea that you can implement yourself. That will be more helpful for you.

Modified Version of the Previous Program

Here is the complete version of the previous program that deletes a word from a string. This program also removes extra spaces from the new string.

#include<iostream>
#include<stdio.h>
#include<string.h>
using namespace std;
int main()
{
    char str[200], wrd[20];
    int i, j, strLen, wrdLen, tmp, chk=0;
    int doIncrement, isSpace;
    cout<<"Enter the String: ";
    gets(str);
    cout<<"Enter the Word: ";
    cin>>wrd;
    strLen = strlen(str);
    wrdLen = strlen(wrd);
    for(i=0; i<strLen; i++)
    {
        tmp = i;
        doIncrement = 0;
        for(j=0; j<wrdLen; j++)
        {
            if(str[i]==wrd[j])
            {
                if(tmp>0 && (tmp+wrdLen)<strLen)
                {
                    if(str[tmp-1]== ' ' && str[tmp+wrdLen]==' ')
                        doIncrement=1;
                }
                else if(tmp==0 && (tmp+wrdLen)<strLen)
                {
                    if(str[tmp+wrdLen]==' ')
                        doIncrement=1;
                }
                else if(tmp>0 && (tmp+wrdLen)==strLen)
                {
                    if(str[tmp-1]== ' ')
                        doIncrement=1;
                }
                if(doIncrement==1)
                    i++;
                else
                    break;
            }
        }
        chk = i-tmp;
        if(chk==wrdLen)
        {
            i = tmp;
            for(j=i; j<(strLen-wrdLen); j++)
                str[j] = str[j+wrdLen];
            strLen = strLen-wrdLen;
            i = tmp;
            str[j]='\0';
        }
    }
    strLen = strlen(str);
    i=0;
    while(str[i]!='\0')
    {
        isSpace = 0;
        if(str[i]==' ' && str[i+1]==' ')
        {
            for(j=i; j<(strLen-1); j++)
            {
                str[j] = str[j+1];
                isSpace = 1;
            }
        }
        if(i==0 && str[i]==' ')
        {
            for(j=i; j<(strLen-1); j++)
            {
                str[j] = str[j+1];
                isSpace = 1;
            }
        }
        if(isSpace==0)
            i++;
        else
        {
            str[j]='\0';
            strLen--;
        }
    }
    cout<<"\nNew String = "<<str;
    cout<<endl;
    return 0;
}

Here's an example run with user input; this is is is isth fresherearth as a string, and is as the word to delete:

remove word from string c++

In C++, delete a word from a string using a two-dimensional array

Using a two-dimensional array, the program becomes easier to create or understand. Here is the program:

#include<iostream>
#include<stdio.h>
#include<string.h>
using namespace std;
int main()
{
    char str[400], wrd[20], strInTwoDArray[20][20];
    int i, j=0, k=0;
    cout<<"Enter the String: ";
    gets(str);
    cout<<"Enter the Word (to be Delete): ";
    gets(wrd);
    for(i=0; str[i]!='\0'; i++)
    {
        if(str[i]==' ')
        {
            strInTwoDArray[k][j]='\0';
            k++;
            j=0;
        }
        else
        {
            strInTwoDArray[k][j]=str[i];
            j++;
        }
    }
    strInTwoDArray[k][j] = '\0';
    j=0;
    for(i=0; i<(k+1); i++)
    {
        if(!strcmp(strInTwoDArray[i], wrd))
            strInTwoDArray[i][j]='\0';
    }
    cout<<"\nThe New String is: ";
    j=0;
    for(i=0; i<(k+1); i++)
    {
        if(strInTwoDArray[i][j] == '\0')
            continue;
        else
            cout<<strInTwoDArray[i];
    }
    cout<<endl;
    return 0;
}

Here's a sample run with user input: is is is this is isth this is (as a string) and is (as a word):

delete word from string using two array c++

The same program in different languages

C++ Quiz

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