Question

3. Create a program which allows the user to swap individual words in an input string. Given a string of input, your program should count and store the number of words in a 2D array. The user can then select the index of the words they want to swap. Your program should swap those two words and then print the entire string to ouput. • Use string prompt "> ". • Use indices prompt "Enter two indices: ". • Remove the trailing newline character from the string. • Save your code as swap_words.c.

Example Run > You can tell a lot about a place by how they treat their people Enter two indices: 7 13 You can tell a lot about a people by how they treat their place

How to write in C?

Answer 1

code:

#include<stdio.h>
#include<string.h>
int main()
{
        /*string is to strore input*/
        /*words is a 2d array to store words*/
        char string[10000];
        char words[100][100],t[100];
        int strpos,wordpos,count,i,first,second,temp;
        printf(">");
        scanf("%[^\n]s",&string);
        printf("Enter tow indices:");
        scanf("%d%d",&first,&second);
        strpos=0;
        wordpos=0;
        count=0;
        /*strpos is iterator for string */
        /*count is the number of words*/
        /*wordpos is the iterator for word*/
        while(string[strpos]!='\0')
        {
                if(string[strpos]==' ')
                {
                        wordpos=0;
                        strpos++;
                        count++;
                }
                else
                {
                        words[count][wordpos]=string[strpos];
                        strpos++;
                        wordpos++;
                }
                
        }
        temp=0;

                strcpy(t,words[first]);
                strcpy(words[first],words[second]);
                strcpy(words[second],t);
                
        
        i=0;
        /*printing the swaped line */
        while(i<=count)
        {
                printf("%s ",words[i]);
                i++;
        }
}

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