FINDING AND REPLACING SUBSTRINGS

/*  FINDING AND REPLACING SUBSTRINGS  */

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

 {

  char s1[50],s2[50],s3[50],a[20],r[50];

  int i,j,k,l1,l2,s=0,p,c=0;

  clrscr();

  printf("\n\t\tINPUT:");

  printf("\n\t\t------");

  printf("\n\t\tEnter the string:  ");

  gets(s1);

  printf("\n\t\tEnter the substring:  ");

  gets(s2);

  printf("\n\t\tEnter the replace string:  ");

  gets(s3);

  l1=strlen(s1);

  l2=strlen(s2);

  for(i=0;i<l1;i++)

    {

      k=0;

      if(s1[i]==s2[0])

       {

         for(j=i;j<i+l2;j++)

          {

            a[k]=s1[j];

            k++;

          }

         a[k]='\0';

         if(strcmp(a,s2)==0)

           {

             for(p=0;s3[p]!='\0';p++)

              {

                r[s++]=s3[p];

              }

             i=i+l2-1;

             c++;

           }

         else

            r[s++]=s1[i];

       }

      else

         r[s++]=s1[i];

     }

  r[s++]='\0';

  printf("\n\t\tOUTPUT:");

  printf("\n\t\t-------");

  if(c==0)

    {

      printf("\n\t\tThe Substring is not Found");

    }

  else

    {

      printf("\n\t\tThe Substring is Found");

      printf("\n\t\tReplaced string is :  %s",r);

    }

  getch();

}

INPUT:

------

Enter the string:  I am doing BCA

Enter the substring:  BCA

Enter the replace string:  Bachelor Degree

OUTPUT:

-------

The Substring is Found

Replaced string is :  I am doing Bachelor Degree

INPUT:

------

Enter the string:  I am doing BCA

Enter the substring:  cs

Enter the replace string:  bca

OUTPUT:

-------

The Substring is not Found