Program that displays the position or index in the string S where the string T begins , or -1 if S doesn’t contain T

Algorithm:

Step 1: start

Step 2: read the string and then displayed

Step 3: read the string to be searched and then displayed

Step 4: searching the string T in string S and then perform the following steps

                                                    i.      found=strstr(S,T)

                                                  ii.      if found print the second string is found in the first string at the position. If not goto step 5

Step 5: print the -1

Step 6: stop

Program:

#include<stdio.h>

#include<string.h>

#include<conio.h>

void main()

{

             char s[30], t[20];

  char *found;

  clrscr();

/* Entering the main string */

  puts("Enter the first string: ");

  gets(s);

           

/* Entering the string whose position or index to be displayed */

  puts("Enter the string to be searched: ");

  gets(t);

           

/*Searching string t in string s */

  found=strstr(s,t);

  if(found)

    printf("Second String is found in the First String at %d position.\n",found-s);

   else

    printf("-1");

  getch();

}

Output:

1.enter the first string:

   kali

   Enter the string to be seareched:

    li

    second string is found in the first string at2position

 2.enter the first string:

    nagaraju

     Enter the string to be seareched:

      raju

     second string is found in the first string at4position

3.enter the first string:

    nagarjuna

    Enter the string to be seareched:

    ma

   -1

Conclusion: The program is error free

VIVA QUESATIONS:

1)      What is the  difference between printf() and puts() ?

Ans: puts() is used to display the string at a time and it doesn’t take  any integers values but printf() takes any values as defined by the user

2)      define pointer variable ?

Ans: pointer variables are  defined as variable that contain the memory addresses of data or executable code.

3)      What is use of the strcmp() function ?

Ans: This function compares two strings character by character and returns a value 0 if both strings are equal and non zero value if the strings are different.