import java.io.*;
public class work
{ float opr1,opr2,result;
char opr; public static void main (String args[])throws IOException {
float opr1,opr2,result;
char opr;
InputStreamReader we = new InputStreamReader(System.in);
BufferedReader shuru=new BufferedReader(we);
System.out.println("请输入操作数opr1:");
opr1=Float.parseFloat(shuru.readLine());
System.out.println("请输入操作数opr2:");
opr2=Float.parseFloat(shuru.readLine());
System.out.println("请输入操作符opr:");
opr = (char)System.in.read();
zch();
System.out.println(result);
}
public void zch() {
switch (opr)
{
case '-':
this.result = this.opr1 - this.opr2;
break;
case '+':
this.result = this.opr1 +this.opr2;
break;
case '*':
this.result = this.opr1 * this.opr2;
break;
case '/':
if(opr2 == 0)
System.out.println("ERROR!");
else
this.result = this.opr1 / this.opr2;
break;
}
}
}
public class work
{ float opr1,opr2,result;
char opr; public static void main (String args[])throws IOException {
float opr1,opr2,result;
char opr;
InputStreamReader we = new InputStreamReader(System.in);
BufferedReader shuru=new BufferedReader(we);
System.out.println("请输入操作数opr1:");
opr1=Float.parseFloat(shuru.readLine());
System.out.println("请输入操作数opr2:");
opr2=Float.parseFloat(shuru.readLine());
System.out.println("请输入操作符opr:");
opr = (char)System.in.read();
zch();
System.out.println(result);
}
public void zch() {
switch (opr)
{
case '-':
this.result = this.opr1 - this.opr2;
break;
case '+':
this.result = this.opr1 +this.opr2;
break;
case '*':
this.result = this.opr1 * this.opr2;
break;
case '/':
if(opr2 == 0)
System.out.println("ERROR!");
else
this.result = this.opr1 / this.opr2;
break;
}
}
}
import java.io.*;public class work { public static void main(String args[]) throws IOException {
float opr1, opr2, result;
char opr;
InputStreamReader we = new InputStreamReader(System.in);
BufferedReader shuru = new BufferedReader(we);
System.out.println("请输入操作数opr1:");
opr1 = Float.parseFloat(shuru.readLine());
System.out.println("请输入操作数opr2:");
opr2 = Float.parseFloat(shuru.readLine());
System.out.println("请输入操作符opr:");
opr = (char) System.in.read();
result=zch(opr1, opr2,opr);
System.out.println(result);
} public static float zch(float opr1, float opr2, char opr) {
switch (opr) {
case '-':
return opr1 - opr2;
case '+':
return opr1 + opr2;
case '*':
return opr1 * opr2;
case '/':
if (opr2 == 0)
System.out.println("ERROR!");
else
return opr1 / opr2;
}
return 0;
}
}
public class work {
float opr1,opr2,result=0;
char opr; public static void main (String args[])throws IOException {
new work().zch();
}
public void zch() {
try{
InputStreamReader we = new InputStreamReader(System.in);
BufferedReader shuru=new BufferedReader(we);
System.out.println("请输入操作数opr1:");
opr1=Float.parseFloat(shuru.readLine());
System.out.println("请输入操作数opr2:");
opr2=Float.parseFloat(shuru.readLine());
System.out.println("请输入操作符opr:");
opr = (char)System.in.read();
}catch(Exception e){}
switch (opr) {
case '-':
result = opr1 - opr2;
System.out.println(result);
break;
case '+':
result = opr1 +opr2;
System.out.println(result);
break;
case '*':
result = opr1 * opr2;
System.out.println(result);
break;
case '/':
if(opr2 == 0)
System.out.println("ERROR!");
else
result = opr1 / opr2;
System.out.println(result);
break;
}
}
}建议使用设计模式中简单工厂模式来写,有利于重构
zch();
System.out.println(result); 把这三行换成
System.out.println(Double.parseDouble(opr1+opr+opr2)); 试一下
public class Work
{ static float opr1,opr2,result;
static char opr;
//这里改为静态的。public static void main (String args[])throws IOException {
//float opr1,opr2,result;
//char opr;
//这里就没有用了。
InputStreamReader we = new InputStreamReader(System.in);
BufferedReader shuru=new BufferedReader(we);
System.out.println("请输入操作数opr1:");
opr1=Float.parseFloat(shuru.readLine());
System.out.println("请输入操作数opr2:");
opr2=Float.parseFloat(shuru.readLine());
System.out.println("请输入操作符opr:");
opr = (char)System.in.read();
zch(); //这里你和用成全角符号了
System.out.println(result);
}
public static void zch()
//这里也要改为静态的,不能用this.
{
switch (opr)
{
case '-':
result = opr1 - opr2;
break;
case '+':
result = opr1 +opr2;
break;
case '*':
result = opr1 * opr2;
break;
case '/':
if(opr2 == 0)
System.out.println("ERROR!");
else
result = opr1 / opr2;
break;
}
}
}
class jaijai{
public static void main(String [] aa)throws IOException{
float ap1,ap2,ap3;
char ch;
BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入一个数字");
ap1=Float.parseFloat(in.readLine());
System.out.println("请再输入一个数字");
ap2=Float.parseFloat(in.readLine());
System.out.println("请输入一个运算符");
ch=(char)System.in.read();
chn(ap1,ap2,ch);}
static void chn(float ap1,float ap2,char ch){
switch(ch){
case '+':
System.out.println(ap1+ap2);
case '/':
System.out.println(ap1/ap2);
case '-':
System.out.println(ap1-ap2);
case '*':
System.out.println(ap1*ap2);
}
}
}
static float opr1, opr2, result;
static char opr;
public static void main(String args[]) throws IOException {
InputStreamReader we = new InputStreamReader(System.in);
BufferedReader shuru = new BufferedReader(we);
System.out.println("请输入操作数opr1:");
opr1 = Float.parseFloat(shuru.readLine()); //静态方法中不能直接使用非static的变量
System.out.println("请输入操作数opr2:");
opr2 = Float.parseFloat(shuru.readLine());//静态方法中不能直接使用非static的变量
System.out.println("请输入操作符opr:");
opr = (char) System.in.read(); //静态方法中不能直接使用
//非static的变量 zch();
System.out.println(result);
} public static void zch() { //非静态的方法中是可以直接使用静态的变量的 如:opr 、result 、
// opr1、opr2
switch (opr) {
case '-':
result = opr1 - opr2;
break;
case '+':
result = opr1 + opr2;
break;
case '*':
result = opr1 * opr2;
break;
case '/':
if (opr2 == 0)
System.out.println("ERROR!");
else
result = opr1 / opr2;
break;
}
}
}