#include <stdio.h>
#include <math.h>
 
struct triangle{
	int a;
	int b;
	int c;
};
 
int main(void)
{
	struct triangle menseki;
 
	menseki.a = 5;
	menseki.b = 5;
	menseki.c = 5;
 
	printf("a:%d\n", menseki.a );
	printf("b:%d\n", menseki.b );
	printf("c:%d\n", menseki.c );
 
	double s, result;
 
	s = ( menseki.a + menseki.b + menseki.c ) / 2.0;
 
	result = sqrt ( s * ( s-menseki.a) * ( s-menseki.b) * ( s-menseki.c) );
 
	printf("三角形の面積 : %f\n", result);
 
	return 0;
}
 

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