Insert character at a location in a string

Posted on Apr 21, 2020

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

Program

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

void insert(char str[MAX], char ch, int pos)
{
    int i, len;

    len = strlen(str);
    if(pos<=0 || pos>len+1)
    {
        printf("\nInsertion can not be done at this position");
        getch();
        exit(0);
    }

    else
    {
        for(i=len-1;i>=pos-1;i--)
        {
            str[i+1] = str[i];
        }
        str[pos-1] = ch;
        str[len+1] = '\0';
    }
}

void main()
{
	char str[MAX];
    char ch;
    int pos;

    printf("Enter first string\t:");
    gets(str);
    printf("Enter the character to be inserted\t:");
    scanf("%c",&ch);
    printf("Enter the position at which it is to be inserted\t:");
    scanf("%d",&pos);

    insert(str, ch, pos);

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

    getch();
}

Output

Enter first string      :welcome to cousecrux.com
Enter the character to be inserted      :r
Enter the position at which it is to be inserted        :15

Modified string :welcome to coursecrux.com