write a program detab that replaces tabs in the input with the proper number of blanks to space to the next tab stop. Assume a fixed set of tab stops, say every n columns.Should n be a variable or a symbolic parameter?

#include <stdio.h>

#define TABINC    8      /*tab increment size */

/*replace tabs with the proper number of blanks   */
int main(){
    int c, nb, pos;

    nb =0;       /*number of blanks necessary */
    pos = 1;     /*position of character in line */
    while((c =getchar()) != EOF){
          if (c == '\t'){    /*tab character        */
               nb =TABINC - (pos  -1) % TABBINC;
               while(nb > 0){
                    putchar(' ');
                    ++pos;
                     --nb;
               }
          }else if (c == '\n') {   /* newline character */
                  putchar(c);
                  pos = 1;
          }else{   /* all other characters */
                putchar(c);  
                 ++pos;
             }
    }
}