Substring program without library function | C Language

Q : Write a ‘C’ Program to find substring of string without using Library Function.

Answer :

#include<stdio.h>

#include<conio.h>

#define MAX 50

/*============================

     Girfa Student Help

     Substring wihout using library function

==============================*/

void main()

{

     char str[100];

     int len,i,start,end;

     clrscr();

     printf("Enter String>> ");

     scanf("%[^\n]",str);

     /* get len */

     for(len=0;str[len]!='\0';len++);

     printf("Enter start point>> ");

     scanf("%d",&start);

     printf("Enter end point>> ");

     scanf("%d",&end);

     if(start>end)

           puts("Invalid input. start is greater than end index");

     else if(end>len)

           puts("End index is greater than string length");

     else

     {

           for(start--;start<end;start++)

           {

                printf("%c",str[start]);

           }

     }

     getch();

}

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