如何用Java编程迷你计算器
最新回答
少年风流曾几时
2024-11-05 02:40:24
import java.awt.*;
import java.applet.*;
public class calc10 extends Applet {
char key,prevopr;
float ans,num;
char[] btext={'0','1','2','3','4','5',
'6','7','8','9','-','+','*','/'};
Button[] buttons = new Button[btext.length];
public void init() {
for (int i=0; i<btext.length; i++) {
buttons[i] = new Button(""+btext[i]);
add(buttons[i]);
}
}
public float apply(float num1, char opr, float num2) {
switch (opr) {
case '+': return(ans+num);
case '-': return(ans-num);
case '*': return(ans*num);
case '/': return(ans/num);
default: return(num);
}
}
public boolean action(Event evt,Object arg){
key = ((String)arg).charAt(0);
if(key>='0' && key<='9') {
num = (float)(key-'0');
showStatus(""+key);
} else {
ans = apply(ans,prevopr,num);
showStatus( "" + ans );
prevopr=key;
}
return true;
}
}
冰月灵狐
2024-11-05 08:45:33
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