公共靜態空計算(雙x){
double y = 0;
if(x & lt;=0){
y = x * x+1;
} else if(x & gt;0 & amp& ampx & lt=10){
y = 2 * x+10;
}否則{
y = 7 * x-15;
}
System.out.println("x="+x+",結果y = "+y);
}
公共靜態void main(String[] args){
demo . calc(-5);
demo . calc(6);
demo . calc(30);
}
}