大神能把每一行的输出值都解答出来嘛,感谢感谢
28 // a= 4 b =10 c=a+b=4+10=14 >>a=b+c = 28
30 // a= 4 b =10 c=b=10 >>fun() a=10 b =10 c=10 >>a=b+c = 30
34 //a=10 b =10 c =14 >> a+b+c =34
29 //a=5 b =10 c =14 >> a+b+c =29