代码1. s=plus( plus(a,b) , c );
代码2: s=plus(plus(a,b,c) , d );
代码3: System.out.println( plus(1,2) );
代码4: System.out.println( plus(1,2,3) );
代码5: System.out.println( plus(1,2,3,4) );
1> s=plus(a,b);
s = plus(s,c);
2> s = plus(a,b,c);
s= plus(s,d);
3,4,5>
System.out.println(p.plus(1,2));
System.out.println(p.plus(1,2,3));
System.out.println(p.plus(1,2,3,4));
1.s = this.plus(a, b)+this.plus(0, c);
2.s = this.plus(a, b,c)+this.plus(0, 0,d);
3.System.out.println("1+2="+p.plus(1,2));
4.System.out.println("1+2+3="+p.plus(1,2,3));
5.System.out.println("1+2+3+4="+p.plus(1,2,3,4));
1.s=plus(plus(a,b),c)
2.s=plus(plus(a,b,c),d)