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 }
Modern compilers employ sophisticated algorithms to determine what values are
computed in a program and how they are used.
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