Exercise 1-20

Exercise 1-20. Write a program detab that replaces tabs in the input with the proper numberof 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 TABWIDTH 8

int main(){
    char s[200], c;
    int len, t;

    len = 0;
    while((c = getchar()) != '\n'){
        if(c != '\t')
            s[len++] = c;
        else
            for(t = TABWIDTH - len % TABWIDTH; t > 0; t--)
                s[len++] = ' ';
    }
    s[len++] = c;
    s[len] = '\0';
    
    printf("%s", s);
}