How to use JAVA to write a simple calculator
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Xiaobai: How does JAVA write a calculator? ? ? With a dumb look...
Teacher: Let you not listen carefully
Teaching time
Idea: Use the nature of the if statement to determine the input operator.
Judge which calculation statement to execute, and then calculate and output the result.
Knowledge points:
if ···judgment statement
else ···otherwise statement
double···floating point function
char···character function
Below is the implemented code
import java.util.Scanner;
public class 计算器{
public static void main(String[] args) {
System.out.println("这是一个可以计算 +， -， *， /， 的计算器");
Scanner num=new Scanner(System.in);
System.out.println("请输入第一个计算的数字");
double num1=num.nextInt();
System.out.println("请输入一个运算符");
char x = num.next().charAt(0);
System.out.println("请输入第二个计算的数字");
double num2=num.nextInt();
double result ;
if (x=='+') {
result=num1+num2;
System.out.println(num1+"+"+num2+"="+result);
}
else if (x=='-') {
result=num1-num2;
System.out.println(num1+"-"+num2+"="+result);
}
else if (x=='*') {
result=num1*num2;
System.out.println(num1+"*"+num2+"="+result);
}
else if (x=='/') {
result=num1/num2;
System.out.println(num1+"/"+num2+"="+result);
}
else
System.out.println("我就知道有憨憨会输入错误0.0");
}
}