if(arg 0 = = null | | arg 0 . length = = 0){

System.out.println ("Please enter parameters: a, b, c");

system . exit(0)；

}

for(int I = 0； I< arg0.length; i++){

Try {

float . parse float(arg 0[I])；

Catch (exception e){

System.out.println ("Please enter a number");

system . exit(0)；

}

}

float a = float . parse float(arg 0[0])；

Floating point b = 0；;

Floating point c = 0；;

if(arg 0 . length & gt； = 2){

b = float . parse float(arg 0[ 1])；

}

if(arg 0 . length & gt； = 3){

c = float . parse float(arg 0[2])；

}

float tmp = b * b-4 * a * c；

if(tmp & lt； 0 ){

System.out.println("x has no real root ");

system . exit(0)；

}

if(a = = 0 & amp； & ampb = = 0 & amp& ampc==0){

System.out.println("x has any real number root ");

system . exit(0)；

}

Floating-point result = (-1) * b/(2 * a);

if(tmp == 0){

system . out . println(" x 1 = x2 = "+result ")；

system . exit(0)；

}

float x 1 =((- 1)* b+ Java . lang . math . sqrt(tmp))/(2 * a)；

float x2 =((- 1)* b-Java . lang . math . sqrt(tmp))/(2 * a)；

system . out . println(" x 1 = "+x 1 ")；

system . out . println(" x2 = "+x2 ")；

}