C语言实现一元二次方程的解 源程序
#include
#include
float x1,x2,p,q,d;
float great_than_zero(float,float);
float equql_to_zero(float,float);
float smaller_than_zero(float,float);
main()
{
float a,b,c;
printf(“Enter a,b,c:”);
scanf(“%f%f%f”,&a,&b,&c);
d=b*b-4*a*c;
if(d>0)
{
great_than_zero(a,b);
printf(“x1=%5.2f\tx2=5.2f\n”,x1,x2);
}
else if(d==0)
{
equal_to_zero(a,b);
printf(“x1=x2=%6.2f\n”,x1);
}
else
{
smaller_than_zero(a,b);
printf(“x1=%5.2f+%5.2f\n”,p,q);
printf(“x2=%5.2f-%5.2f\n”,p,q);
}
return 0;
}
float great_than_zero(float x,float y)
{
x1=(-y+sqrt(d))/(2*x);
x2=(-y-sqrt(d))/(2*x);
return ;
}
float equql_to_zero(float x,float y)
{
x1=(-y)/(2*x);
return;
}
float smaller_than_zero(float x,float y)
{
p=-y/(2*x);
q=sqrt(-d)/(2*x);
return;
}
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