<分区>
我正在尝试用 java 制作一个简单的基于文本的计算器 我的第一个程序，EVER 但我不知道如何将输入 String 转换为变量 opOne。然后，我将尝试使用 opOne 作为运算符对 numTwo 操作 numOne。
代码如下:
import java.io.*;
import java.math.*;
public class ReadString {
public static void main (String[] args) {
System.out.print("Enter the first number: ");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int numOne = 0 ;
int numTwo = 0 ;
String opOne = null;
while(true){
try {
numOne = Integer.valueOf(br.readLine());
break;
} catch (IOException error) {
System.out.println("error; try again.");
System.exit(1);
}
catch (NumberFormatException nfe) {
System.out.println("error;try again.");
}
}
System.out.print("Enter the second number: ");
while(true){
try {
numTwo = Integer.valueOf(br.readLine());
break;
} catch (IOException error2) {
System.out.println("error");
System.exit(1);
} catch (NumberFormatException nfe) {
System.out.println("error;try again.");
}
}
System.out.println("What would you like to do with " + numOne + " and " + numTwo + "?");
try {
operator = br.readLine();
} catch (IOException ioe) {
System.out.println("error");
System.exit(1);
} catch (NumberFormatException nfe) {
System.out.println("error");
}
}
}