ptb21.cpp

examples C,c++ codes programs

#include<stdio.h>
#include<conio.h>
#include<math.h>
float ptb1(float b, float c)
{	float x;
	if (b==0)
	if (c==0) 
	printf("pt co vsn");
	else printf("pt vn");
	else printf("pt co nghiem duy nhat x = %f",x=-c/b);
	return x;
}
float ptb2 (float &a,float &b,float c)
{	
	float x1 ,x2, denta;
	denta=b*b-4*a*c;
	if (denta<0) printf("ptvn");
	else 
	if(denta==0)
	printf("pt co ng kep x1=x2=%f",-b/(a*2));
	else
	printf("pt co 2 ng:  x1 = %f,x2 = %f",x1=(-b-sqrt(denta))/(2*a),x2=(-b+sqrt(denta))/(2*a));
}
void main ()
{
	float a,b,c;
	printf("nhap vao he so cua pt: ");
	scanf("%f%f%f",&a,&b,&c);
	if (a==0)
	ptb1(b,c);
	else 
	ptb2(a,b,c);
getch();
}