added 7.1

1 files changed, 46 insertions, 0 deletions

diff --git a/7_1/main.c b/7_1/main.c
new file mode 100644
index 0000000..ef4536b
--- /dev/null
+++ b/7_1/main.c
@@ -0,0 +1,46 @@
+#include<stdlib.h>
+#include<stdio.h>
+
+/* бля какой же код охуенный */
+/* ломается, если x = 0x8000000000000000 */
+char* tobin(long int x) {
+	size_t i = 0, j = 0;
+	char buffer[64];
+	char *ret;
+	char sgn = x < 0;
+
+	x *= ((x > 0) << 1) - 1;
+	printf("%li\n", x);
+	for (; x; x >>= 1) buffer[i++] = '0' + (x & 1);
+	ret = calloc(i + 1 + sgn, sizeof *ret);
+	ret[0] = '-';
+	j += sgn;
+	while (i) ret[j++] = buffer[--i];
+
+	return ret;
+}
+
+int main(int argc, char* argv[]) {
+	long number;
+	char *bin;
+
+	if (argc != 2) {
+		fprintf(stderr, "\x1b[91mError: Invalid amount of arguments\x1b[0m\n"
+				"Usage: \x1b[92m%s <number>\n\x1b[0m", argv[0]);
+		return 1;
+	}
+
+	number = atol(argv[1]);
+	if (number == 0) {
+		puts("Binary for 0: 0");
+		return 0;
+	}
+	if (number == 0x8000000000000000) {
+		puts("Aha, I see what you did there)");
+		return 1;
+	} 
+	bin = tobin(number);
+	printf("Binary for %li: %s\n", number, bin);
+	free(bin);
+	return 0;
+}