2 versions now

1 files changed, 59 insertions, 0 deletions

diff --git a/main1.c b/main1.c
new file mode 100644
index 0000000..164a8ed
--- /dev/null
+++ b/main1.c
@@ -0,0 +1,59 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <math.h>
+
+#define GEN_MAX 1000000000
+
+static int tenpow(int pow) {
+	int base = 10;
+	int ret = 1;
+	while (pow) {
+		if (pow & 0b1)
+			ret *= base;
+		base *= base;
+		pow >>= 1;
+	}
+	return ret;
+}
+
+static char get_at_pos(unsigned int n, int pos) {
+	n /= tenpow(pos);
+	return n % 10;
+}
+
+int main(int argc, char *argv[]) {
+	srand(time(NULL));
+	int arr[10] = {0};
+	unsigned int gen;
+
+	int iters, pos;
+	if (argc == 3) {
+		iters = atoi(argv[1]);
+		pos = atoi(argv[2]);
+		if (!iters || !pos) goto fail;
+	} else {
+		fputs("Iterations: ", stdout);
+		if (!scanf("%i", &iters)) goto fail;
+		fputs("Position (10^N): ", stdout);
+		if (!scanf("%i", &pos)) goto fail;
+	}
+
+	for (int _ = 0; _ < iters; ++_) {
+		gen = rand() % GEN_MAX;
+#ifdef PRINT_GENERATED
+		printf("%i\n", gen);
+#endif
+		++arr[get_at_pos(gen, pos)];
+	}
+	
+	printf("count of numbers at position %i:\n", pos);
+	for (int i = 0; i < 10; ++i) 
+		printf("\t%i: %i\n", i, arr[i]);
+
+	return EXIT_SUCCESS;
+fail:
+	fputs("Input a valid number\n", stderr);
+	return EXIT_FAILURE;
+}
+