/*program to take a line of input from user in 
char buf[BUFSIZ] and to search for the 
 word entered in char word[5] in the previous input line*/ 
 
/*Run on Linux platform gives error that if the word to be 
searched is successfully searched only if it is the 
1st word of input line */
 
#include<stdio.h>
#include<string.h>
 
int main()
{
char  word[5];i
char *a,*p,*b;
b=p=word;
//flag checks if a match has been found
int flag=0,len,count=0,disp=0;
char buf[BUFSIZ];
char *c;
a=buf;
 printf ("Please enter a line of text, max %d characters\n", sizeof(buf));
 
 if (fgets(buf, sizeof(buf), stdin) != NULL)
 {
   printf ("Thank you, you entered >%s<\n", buf);
 
   /*
    *  Now test for, and remove that newline character
    */
   if ((c= strchr(buf, '\n')) != NULL)
     *c = '\0';
}
 
printf("\n\nEnter word needed\n");
printf("\n\nYou entered %s of length %d",word,len);
while(*a!='\0')
 {
   if(*a == *p)
      {/*count shows how many continuous match of letters takes place*/
       a++;p++;count++;printf("\nCount=%d",count);
      }
   else
      {
         if((count==len || count==len-1)
           &&(*a ==' '|| *a == '\t' || *a == '\0'))
             {
                 printf("\n\nMAtch");flag=1;
                  break;
             }
         else
            {  if(*a == '\0')
                   { break ;}
                else
                    {
                     count=0;
                     while(*a != ' '|| *a != '\t' &&  *a != '\0' )
                          { if(*a=='\0')
                                     break;
                              else
                                  {
 /*disp is used to know how many times this loop works.*/
/*The Disp values printed shows that pointer(a)
 is incremented to end  while 
no checking for matching is done*/
                                     a++;disp++;
                                 printf("\nDisp=%d",disp);
                                  }
                           }
                    if(*a != '\0')
                       { a++;p=b;}
                     }
            }
      }
  if((*a == '\0') &&(count==len || count==len-1))
         {  printf("\n\nMatch");
            flag=1;
          }
 }
if(flag==0)
printf("\n\n\nNo Match");
return 0; --                                              
}

 
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main()
{
 
char word[10];
char *a,*p,*b;
b=p=word;
//b is storing the base address for future reference
 int flag=0,len,count=0,disp=0;
char buf[BUFSIZ];
char *c;
a=buf;
if (fgets(buf, sizeof(buf), stdin) != NULL)
{
printf ("Thank you, you entered >%s<\n", buf);
/*
* Now test for, and remove that newline character
*/
if ((c= strchr(buf, '\n')) != NULL)
*c = '\0';
}
printf("\n\nEnter word needed\n");
scanf("%s",&word);
len=strlen(word);//len has the length of word to be searched
printf("\n\nYou entered %s of length %d",word,len);
while(*a!='\0')
{
if(*a == *p)
{//count takes the number of continuous matches
a++;p++;count++;printf("\nCount=%d",count);
}
else
{ /*"count == len-1" is used when word to be searched is last one in input line as then '\0' wont be matched*/
       if((count==len || count==len-1)
       &&(*a ==' '|| *a == '\t' || *a == '\0'))
        {
         printf("\n\nMAtch");flag=1;
         break;
         }
     else
        { if(*a == '\0')
            { break ;}
          else
           {
            count=0;
               while(*a != ' '|| *a != '\t' && *a != '\0' )
                 { if(*a=='\0')
                   break;
                    else
                      {/*disp is used to see how the loop works &  
                        suppose here is some problem*/
                       a++;disp++;
                       printf("\nDisp=%d,Value pointed by a:%c",
                               disp,*a);
                       }
                     if(*a != '\0')
                       { a++;p=b;}
                     if(*a == *p)
                         {
                         a++;p++;count++;printf("\nCount=%d",count);
                           }
                    else
                       {
                        if((count==len || count==len-1)
                         &&(*a ==' '|| *a == '\t' || *a == '\0'))
                            {
                              printf("\n\nMAtch");flag=1;
                                break;
                            }
                        }
                      }
                  }
         }
}
      if((*a == '\0') &&(count==len || count==len-1))
      { printf("\n\nMatch");
         flag=1;
       }
}
if(flag==0)
printf("\n\n\nNo Match");
return 0;
}

int main()
{
 
char word[10];
char *a,*p,*b;
b=p=word;
//b is storing the base address for future reference
 int flag=0,len,count=0,disp=0;
char buf[BUFSIZ];
char *c;
a=buf;

   if ( fgets(buf, sizeof(buf), stdin) != NULL )

scanf("%s",&word);

      printf ("Thank you, you entered >%s<\n", buf);
      /*
       * Now test for, and remove that newline character
       */
      if ( (c= strchr(buf, '\n')) != NULL )
         *c = '\0';