반지름입력받기 /원면적구하기

scanf 값 받을때 &round로 입력했어야..

#include <stdio.h>

int main(void) {
	const PI = 3.14;
	float round;

	printf("반지름입력:");
	scanf_s("%f", round,1);

	printf("%f * %f * PI = %f", round, round, round*round*PI);

}

#include <stdio.h>

int main(void) {
	const double PI = 3.14;
	double round = 5;
	printf ("%f * %f * PI = %f", round, round, round*round*PI);
	
	return 0;
}

 

printf ("%f * %f * PI = %f", &round, &round, &round*round*PI);

 

printf일땐 &안씀. scanf 일때 & 쓰는거 ..