Computer Systems A Programmer‘s Perspective Second Edition
1 #include <stdio.h> 2 3 main(){ 4 int wr; 5 wr = func1(); 6 // wr=func2(); 7 printf("%d",wr); 8 } 9 10 int counter = 0; 11 int w(){ 12 return counter++; 13 } 14 15 int func1(){ 16 return w()+w()+w()+w(); 17 } 18 19 int func2(){ 20 return 4*w(); 21 }
Capabilities and Limitations of Optimizing Compilers
原文：http://www.cnblogs.com/yuanjiangw/p/6146260.html