Question

two Java problems

Answer 1

1、

String P="+",M="-",MU="*",D="/";

double result=0;

char cc=c.charAt(0);

if(cc.equals(P)){

result=a+b;

System.out.println("The result for "+a+c+b+" is "+result);

}

你cc是char,而P是String.所以把 char cc=c.charAt(0);换成：String cc=c.substring(0,1);

2.double discount=Integer.parseDouble(discountinpercent);

把Integer换成：Double