Another solution of the exercise

Author: Ankononenko

C Basic Declarations and Expressions/85. Loop numeral to roman (v2).c

@@ -0,0 +1,104 @@
+// Task - output first 100 roman numbers
+// Convert decimal to roman in a loop
+
+#include <stdio.h>
+#include <stdlib.h>
+
+void iterate_over_range(const unsigned char start, const unsigned char end);
+void convert_to_roman(const unsigned char num);
+void roman_hundred(unsigned char *temp_num);
+void roman_fifty(unsigned char *temp_num);
+void roman_ten(unsigned char *temp_num);
+void roman_five(unsigned char *temp_num);
+void roman_one(unsigned char *temp_num);
+void print_newline();
+void print_decimal(const unsigned char num);
+void print_header();
+
+int main(void) {
+  const unsigned char start = 1, end = 100;
+  print_header();
+  iterate_over_range(start, end);
+  return EXIT_SUCCESS;
+}
+
+void print_header() {
+  printf("Decimal  Roman\n"
+         "numbers  numerals\n"
+         "-------------------\n");
+}
+
+// I = 1, V = 5, X = 10, L = 50, C = 100
+void convert_to_roman(const unsigned char num) {
+  unsigned char temp_num = num;
+  while (temp_num) {
+    roman_hundred(&temp_num);
+    roman_fifty(&temp_num);
+    roman_ten(&temp_num);
+    roman_five(&temp_num);
+    roman_one(&temp_num);
+  }
+}
+
+void roman_one(unsigned char *temp_num) {
+while (*temp_num) {
+    printf("I");
+    --*temp_num;
+  }
+}
+
+void roman_five(unsigned char *temp_num) {
+  if (*temp_num >= 5) {
+    printf("V");
+    *temp_num -= 5;
+  }
+  if (*temp_num == 4) {
+    printf("IV");
+    *temp_num -= 4;
+  }
+}
+
+void roman_ten(unsigned char *temp_num) {
+  while (*temp_num >= 10) {
+    printf("X");
+    *temp_num -= 10;
+  }
+  if (*temp_num == 9) {
+    printf("IX");
+    *temp_num -= 9;
+  }
+}
+
+void roman_fifty(unsigned char *temp_num) {
+  if (*temp_num >= 50) {
+    printf("L");
+    *temp_num -= 50;
+  }
+  if (*temp_num >= 40) {
+    printf("XL");
+    *temp_num -= 40;
+  }
+}
+
+void roman_hundred(unsigned char *temp_num) {
+  if (*temp_num >= 100) {
+    printf("C");
+    *temp_num -= 100;
+  }
+  if (*temp_num >= 90) {
+    printf("XC");
+    *temp_num -= 90;
+  }
+}
+
+void print_newline() { printf("\n"); }
+
+void print_decimal(const unsigned char num) { printf("  %-9d", num); }
+
+void iterate_over_range(const unsigned char start, const unsigned char end) {
+  for (unsigned char index = start; index <= end; ++index) {
+    print_decimal(index);
+    convert_to_roman(index);
+    print_newline();
+  }
+}