UC知道这个java类 哪错了 为啥 加减乘除的结果 都输不出来
来源：百度知道 编辑：UC知道 时间：2024/09/21 22:31:59
public class zong {
double he;
double cha;
double ji;
double shang;
double a;
double b;
public double zongshu1(){
double he=a+b;
return he;
}
public void suan(){
System.out.println(a+"+"+b+"="+he);
}
public double zongshu2(){
double cha=a-b;
return cha;
}
public void suan1(){
System.out.println(a+"-"+b+"="+cha);
}
public double zongshu3(){
double ji=a*b;
return ji;
}
public void suan2(){
System.out.println(a+"*"+b+"="+ji);
}
public double zongshu4(){
if(b!=0){
double shang=a/b;}
else{
System.out.println("除数不能为0");
}
return shan
double he;
double cha;
double ji;
double shang;
double a;
double b;
public double zongshu1(){
double he=a+b;
return he;
}
public void suan(){
System.out.println(a+"+"+b+"="+he);
}
public double zongshu2(){
double cha=a-b;
return cha;
}
public void suan1(){
System.out.println(a+"-"+b+"="+cha);
}
public double zongshu3(){
double ji=a*b;
return ji;
}
public void suan2(){
System.out.println(a+"*"+b+"="+ji);
}
public double zongshu4(){
if(b!=0){
double shang=a/b;}
else{
System.out.println("除数不能为0");
}
return shan
没有main方法怎么输出，一般单独的类都要有main方法才能运行。改成这样就可以：
package test;
public class zong {
double he;
double cha;
double ji;
double shang;
double a;
double b;
public double zongshu1(){
he=a+b;
return he;
}
public void suan(){
System.out.println(a+"+"+b+"="+he);
}
public double zongshu2(){
cha=a-b;
return cha;
}
public void suan1(){
System.out.println(a+"-"+b+"="+cha);
}
public double zongshu3(){
ji=a*b;
return ji;
}
public void suan2(){
System.out.println(a+"*"+b+"="+ji);
}
public double zongshu4(){
if(b!=0){
shang=a/b;}
else{
System.out.println("除数不能为0");
}
return shang;
}
public void suan3(){
System.out.println(a+"/"+b+"=&qu