Thread: Why does it hang?

Code:

#include <stdio.h>

unsigned int gcd(unsigned int a, unsigned int b) {
	unsigned int t;
	while (b) {
		t = b;
		b = a&#37;b;
		a = t;
	}
	return a;
}

void inFlush(FILE *in) {
	int ch;
	while ((ch = fgetc(in)) != EOF && ch != '\n') {
		/* f l u s h i n g */
	}
}

char *skipSpace(char *inStr) {
	while (*inStr == ' ' || *inStr == '\t') {
		++inStr;
	}
	return inStr;
}

int main() {
	char buff[1024];
	char *p;
	unsigned int a, b;
	while (1) {
		printf("Enter value for a & b (q will quit): ");
		fgets(buff, sizeof(buff), stdin);
		inFlush(stdin);
		p = skipSpace(buff);
		if (*p == 'q') break;
		sscanf(p, "%u %u", &a, &b);
		printf("GCD of %u & %u is: %u\n\n", a, b, gcd(a, b));
	}
	return 0;
}

This program just hangs even when I enter 'q' just after running
Edit: it needs two <enter>s in a row to run further.