first version of m06e01

module06/ex01/math.c

@@ -0,0 +1,41 @@
+#include "header.h"
+
+void int_to_hex_string(uint64_t value, char *out, uint8_t num_digits) {				// num_digits : number of digit of the output, ex 2 for 3FF (1023) -> FF
+    for (uint8_t i = 0; i < num_digits; ++i) {
+        uint8_t shift = (num_digits - 1 - i) * 4;
+        out[i] = INT_TO_HEX_CHAR((value >> shift) & 0x0F);
+    }
+    out[num_digits] = '\0';
+}
+
+void int_to_string_base(uint64_t value, char *buffer, uint8_t base) {				// buffer must have the right size
+    if (base < 2 || base > 36) {
+        buffer[0] = '\0';															// unsupported base
+        return;
+    }
+
+    // handle zero case
+    if (value == 0) {
+        buffer[0] = '0';
+        buffer[1] = '\0';
+		return;
+    }
+
+	uint8_t size = 0;
+	uint64_t copy = value;
+
+	while (copy) {
+		copy /= base;
+		size++;
+	}
+
+    buffer[size] = '\0';															// null-terminate the string
+    size--;																			// adjust index for last digit
+
+	while (value) {
+		uint8_t digit = value % base;
+		buffer[size] = digit < 10 ? ('0' + digit) : ('A' + digit - 10);
+		value /= base;
+		size--;
+	}
+}