// SPDX-License-Identifier: WTFPL
// cc -Wall -lm freq.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>

struct table {
	char ch;
	double freq;
};

const struct table entry[] = {
	{'z', 0.00074},
	{'q', 0.00095},
	{'x', 0.00150},
	{'j', 0.00153},
	{'k', 0.00772},
	{'v', 0.00978},
	{'b', 0.01492},
	{'p', 0.01929},
	{'y', 0.01974},
	{'g', 0.02015},
	{'f', 0.02228},
	{'w', 0.02360},
	{'m', 0.02406},
	{'u', 0.02758},
	{'c', 0.02782},
	{'l', 0.04025},
	{'d', 0.04253},
	{'r', 0.05987},
	{'h', 0.06094},
	{'s', 0.06327},
	{'n', 0.06749},
	{'i', 0.06966},
	{'o', 0.07507},
	{'a', 0.08167},
	{'t', 0.09056},
	{'e', 0.12702},
};

static void display_result_log(char ch, double ratio, double base)
{
	int i, n;

	ratio *= base;
	n = log(ratio) / log(base) + 0.5;

	for (i = 0; i < n; i++)
		putchar(ch);
}

static void display_result_linear(char ch, double ratio, double base)
{
	int i, n;

	n = ratio * 2 + 0.5;

	for (i = 0; i < n; i++)
		putchar(ch);
}

int main(int argc, char *argv[])
{
	int i;
	double d, base;
	void (*func)(char, double, double);

	base = (argc < 2) ? exp(1) : atof(argv[1]);
	func = (base < 1.0) ? display_result_linear : display_result_log;

	printf("CharGroup0 = ");

	for (i = sizeof(entry) / sizeof(struct table) - 1; i >= 0; i--) {
		d = entry[i].freq / entry[0].freq;
		(*func)(entry[i].ch, d, base);
	}

	printf("\n");

	return 0;
}