# include <math.h>
int main (void)
{
int a = 1
int b = 2
int c = 2
double x1
double x2
double delta
delta = ( b*b - 4*a*c)
if (delta>0)
{
x1= ( -b + sqrt(delta) ) / (2*a)
x2= ( -b - sqrt(delta) ) / (2*a) //delta写错了
printf ("此函数有两个解,x1=%f,x2 = %f",x1,x2 ) //浮点数用%f
}
else if (delta==0)
{
x1 = (-b)/(2*a)
x2 = x1
printf("此函数有唯一解,x1 = %f",x1,x2) //浮点数用%f
}
if ( delta<0)
{
printf("此函数无解")
}
return 0
}