Thread: Problem on finding frequency of an expression

I have write this program but have an unexpected output. Can anyone help me to find what is the problem and modify it? I need to input text file in this program too.

Code:

         while(fgets(str,300,infp)!=NULL)
         {
           puts(str);
         }
         printf("What expressions do you want to find? Please enter here: \n");
         gets(ex_str);
        
         if(strncmp(ex_str,str,strlen(ex_str))==0);
         count2++;
        
         printf("Total no of that expression appears %d times\n",count2);

What exactly are you trying to do here?

Code:

while(fgets(str,300,infp)!=NULL)
{
   puts(str);
}

This would keep reading the input stream and putting the same to the output stream until an error happens with fgets. You should look for EOF.

Code:

if(strncmp(ex_str,str,strlen(ex_str))==0);
count2++;

I think semicolon ( ; ) at the end of if statement wasn't delibrate.

Sorry, i don't really understand what the use of
fgets( ex_str, sizeof ex_str, stdin ); is. Would you mind explaining it for me?

fgets(ex_str, sizeof ex_str, stdin);

reads input from standard input and stores it in ex_str, the sizeof ex_str argument ensures no overflow occurs.

from code it looks like your trying to read in a file and searching the file for an expression and finally printing the number of times that expression appears.

peter