scanf("%lf",&b);

// scandbl.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

int main(int argc, char* argv[])
{
//*
	double a,b,c;
	printf("Input a:");
	scanf("%lf",&a);
	printf("Input b:");
	scanf("%lf",&b);
	c = -a/b;
	printf("%lf\n",c);

	printf("Hello World!\n");
//*/
//*
	{
	float a,b,c;
	printf("Input a:");
	scanf("%f",&a);
	printf("Input b:");
	scanf("%f",&b);
	c = -a/b;
	printf("%f,%lf\n",c,c);
	}
	//*/
	/*
	{
	float a,b,c;
	printf("Input a:");
	scanf("%lf",&a);
	printf("Input b:");
	scanf("%lf",&b);
	c = -a/b;
	printf("%lf\n",c);
	}
	*/
	return 0;
}
/*
Input a:1
Input b:2
-0.500000
Hello World!
Input a:3
Input b:5
-0.600000,-0.600000
Press any key to continue
*/