#include <iostream>
#define NDEBUG //关闭断言
#include <cassert>
using std::cout;
using std::endl;
int main(){
int x=0;
int y=5;
for(x=0;x<20;x++){
cout << "x= " << x << " y= "<<y<<endl;
assert(x<y);
}
return 0;
}
原文：http://www.cnblogs.com/mengfanrong/p/3885778.html