1 /*
2  * 1-20. 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?
3  */
4 
5 #include <stdio.h>
6 #define TABSTOP 8
7 
8 main()
9 {
10 	int c;
11 	int col = 1, i;
12 	while ((c = getchar())!=EOF) {
13 		if (c == '\t') {
14 			for (i = 0; i == 0 || (i+col-1)%TABSTOP != 0; ++i) {
15 				printf(" ");
16 			}
17 			col += i;
18 		} else {
19 			printf("%c", c);
20 			++col;
21 			if (c == '\n')
22 				col = 1;
23 		}
24 	}
25 }