Insert word at a location in a string

Posted on Apr 21, 2020

C program to insert word at any desired location in a string.

Program

#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<stdlib.h>
#define MAX 50

int split_words(char str[MAX], char words[MAX][MAX])
{
    int i, j, count;
    char prev_char;

    i = 0;
    j = 0;
    count = 0;
    prev_char = '\0';

    while(1)
    {
        if(str[i] == ' ' || str[i] == '\t' || str[i] == '\0')
        {
            if(prev_char!=' ' && prev_char!='\t' && prev_char!='\0')
            {
                words[count][j] = '\0';
                count++;
                j = 0;
            }

        }
        else
        {
            words[count][j] = str[i];
            j++;
        }
        prev_char = str[i];
        if(str[i] == '\0')
            break;
        else
            i++;
    }

    return(count);
}

void main()
{
	char str1[MAX], str2[MAX];
    char words[MAX][MAX];
    int count, i, j;
    int pos, new_pos, len1, len2;


    printf("Enter the string\t:");
    gets(str1);
    printf("Enter the word to be added to the string\t:");
    gets(str2);
    printf("Enter the position at which word is to be added\t:");
    scanf("%d",&pos);

    count = split_words(str1, words);

    if(pos<=0 || pos>count)
    {
        printf("\nInvalid position");
        getch();
        exit(0);
    }

    new_pos = 0;
    for(i=0;i<pos-1;i++)
    {
        new_pos = strlen(words[i]) + new_pos;
    }
    new_pos = new_pos + (pos-1);   //blank spaces

    len1 = strlen(str1);

    len2 = strlen(str2);
    str2[len2] = ' ';
    str2[len2+1] = '\0';
    len2 = strlen(str2);

    for(i=len1-1;i>=new_pos-1;i--)
    {
        str1[i+len2] = str1[i];
    }
    for(i=0;i<len2;i++)
    {
        str1[new_pos+i] = str2[i];
    }
    str1[len1+len2] = '\0';

    printf("\nModified string\t:%s",str1);

    getch();
}

Output

Enter the string        :welcome to coursecrux.com, coding!!!
Enter the word to be added to the string        :happy
Enter the position at which word is to be added :4

Modified string :welcome to coursecrux.com, happy coding!!!