1-20

1-20.c

#include <stdio.h>
#define MAXCHAR 100
#define TABSTOP 5

int detab(char strings[], int clocate, int n);
void cleararray(char array[]);

int main(){
  char strings[MAXCHAR];
  int c;
  int clocate;
  clocate = 0;

  while((c = getchar()) != EOF){
    if(c == '\t'){
      clocate += detab(strings, clocate, TABSTOP);
    }else if(c == '\n'){
      printf("%s\n", strings);
      cleararray(strings);
      clocate = 0;
    }else{
      strings[clocate] = c;
      clocate++;
    }
  }
}

int detab(char strings[], int clocate, int n){
  int i, j;
  i = (n - (clocate % n));
  for(j = 0; j < i; j++){
    strings[clocate + j] = ' ';
  }
  return i;
}

void cleararray(char array[]){
  int i;
  for(i = 0; i < MAXCHAR; i++){
    array[i] = '\0';
  }
}