#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
int main(int argc, char *argv[])
{
   int len1=0;
   FILE* p = stdin;
   char a;
   char b[10+1]; // <<== need one more byte for the terminator
   //p = fopen(argv[1],"r");
   while (len1 < 10) // <<== avoid buffer overruns
   {
      a = fgetc(p);
 
      if(a == ' ') break;
      else
      {
         len1++; 
         b[len1-1] = a;
      }
   }
   b[len1] = '\0'; // <<== Don't forget to zero-terminate
   printf("%s\n", b); // <<== Pass the buffer, not the last character from it
   return 0;
}
 

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