Create a vertically oriented histogram based on the concepts introduced in chapter 1 of "The C Programming Language"

vertical_histogram.c

#include <stdio.h>

int main() {
  const int MAX_LENGTH = 20;
  int hist_data[MAX_LENGTH] = {0};

  char c='a';
  int current_length = 0;

  while ((c = getchar()) != EOF) {
    if (c == ' ' || c == '\n' || c == '\t'){
      hist_data[current_length]++;
      current_length = 0;
    }
    else
      current_length++;
  }

  int max = 0;
  for(int j=0; j<MAX_LENGTH; j++)
    if (hist_data[j] > max) max = hist_data[j];

  for(int j=max; j > 0; j--) {
    for(int k=0; k<MAX_LENGTH; k++) {
      if (hist_data[k] < j)
        printf(" ");
      else
        printf("-");
    }
    printf("\n");
  }
}