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对于 #if 与 #endif ,我主要说一下两种情况：
第一种就是#if 0 与#endif
这一种就相当于/* */的注释作用,在#if 0与#endif之间的内容就会被屏蔽,不会执行;
第二种就是#if 1与#endif
这一种使用之后,在#if 1与#endif之间的代码依然会执行;
大家有没有注意到：如果#if 后面的是0，那么执行#endif后面的代码。反之为1的话，相反。
废话少说,直接上代码: 这里我定义x和y来判断输出结果; #include<bits/stdc++.h> using namespace std; int
main() { int a,b,x,y; a=3; b=1; #if 1 x=a+b; cout<<x<<" "; #endif y=a-b;
cout<<y<<" "; return 0; }//输出结果:4 2 #include<bits/stdc++.h> using namespace
std; int main() { int a,b,x,y; a=3; b=1; #if 0 x=a+b; cout<<x<<" "; #endif
y=a-b; cout<<y<<" "; return 0; }//输出结果:2
