Declare Submenu in Opengl C++ : In main function, when I declerd submenu I got Two error.

the first error in   `GLint subMenu;` it says "GLint subMenu' previously declared here"

The other error on   `int subMenu;` it show that "redeclaration of 'int subMenu'

Here is a part of main function

    int main(int argc, char** argv) {
        glutInit(&argc, argv);
    
       
         GLint subMenu;
    
        int subMenu;
        subMenu = glutCreateMenu (c_SubMenu);
        glutAddMenuEntry ("Red", 3);
        glutAddMenuEntry ("Green", 2);
        glutAddMenuEntry ("Blue", 1);
        glutAddMenuEntry ("White", 4);
    
        
    }


Could any one explain how to declare Glint variable and int in the same time in order to solve this issue.