Submission #944514

#	Time	Username	Problem	Language	Result	Execution time	Memory
944514		rainboy	제곱근 구하기 1 (gs13068_sqrt1)	C11	Compilation error	0 ms	0 KiB

sqrt1

#include <math.h>
#include <stdio.h>

int main() {
	long long n;
	int r;

	scanf("%lld", &n), r = sqrt(n);
	while ((long long) (r + 1) * (r + 1) <= n)
		r++;
	while ((long long) r * r > n)
		r--;
	printf("%f\n", r + (double) (n - (long long) r * r) / (r * 2 + 1));
	return 0;
}

Compilation message (stderr)

sqrt1.c: In function 'main':
sqrt1.c:8:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |  scanf("%lld", &n), r = sqrt(n);
      |  ^~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccQw6w8u.o: in function `main':
sqrt1.c:(.text.startup+0xe9): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status