c++ - 调试步骤运行不正常

Question

我在 Eclipse 中有一个 makefile 项目，当我调试程序时，运行步骤的顺序不规则。作为以下函数的示例，命令将按以下顺序运行:1,6,1,6,1,... 应该是 6,7,8,...

1    int  get_region(int x, int y, int level, int &region_x, int &region_y, int min_x,int min_y,int max_x,int max_y)
    {
2       int X_distance = max_x - min_x;
3       int Y_distance = max_y - min_y;
4       int steps_x = X_distance / (pow(2,level)) + 1; 
5       int steps_y = Y_distance / (pow(2,level)) + 1;

6       region_x =  (x - min_x) / steps_x;
7       region_y =  (y - min_y) / steps_y;

8       cout << "region_x = " << region_x << "  x = "<< x << endl;
9       cout << "region_y = " << region_y << "  y = "<< y << endl;

10      cout << "****************** get_region function is called  **************"<<endl;

11      return 0;
    }

Answer 1

当您的代码在启用优化的情况下编译时，这是正常行为。编译器会重新排列您的代码以获得更好的性能。

编译时关闭优化以使调试更容易。