输出信息sum  is  579                                             例1.2  求两数之和   #include <stdio.h> void main( )     {   int a,b,sum;         a=123; b=456;   sum=a+b;   printf(″sum is %d＼n″,sum);

给点面子把    我只是个菜鸟好不好  神啊