ex-04: Initial solution

exercise-04-multiplication-table/main.c

@@ -0,0 +1,61 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+int main() {
+	int range;
+
+	printf("Rozsah:\n");
+	if (scanf("%d", &range) != 1) {
+		printf("Nespravny vstup.\n");
+		return EXIT_FAILURE;
+	}
+
+	int largest_number = range * range;
+	int largest_digit_count = 0;
+	int range_digit_count = 0;
+
+
+	int tmp = largest_number;
+	while(tmp != 0) {
+		largest_digit_count++;
+		tmp /= 10;
+	}
+
+	tmp = range;
+	while(tmp != 0) {
+		range_digit_count++;
+		tmp /= 10;
+	}
+
+	// Header
+	for(int i = range + 1; i > 0; i--) {
+		if(i == range + 1) {
+			printf("%*s|", largest_digit_count, "");
+			continue;
+		}
+
+		printf("%*d", largest_digit_count + 1, i);
+	}
+	putchar('\n');
+
+	// Separator
+	for(int j = 0; j < largest_digit_count; j++) {
+		putchar('-');
+	}
+	putchar('+');
+
+	for(int j = 0; j < (largest_digit_count + 1) * range; j++) {
+		putchar('-');
+	}
+	putchar('\n');
+
+	// Table lines
+	for(int line = 1; line <= range; line++) {
+		printf("%*d|", largest_digit_count, line);
+
+		for(int column = range; column >= line; column--) {
+			printf("%*d", largest_digit_count + 1, column * line);
+		}
+		putchar('\n');
+	}
+}