数组赋值中的初始值设定项过多

Question

I'm doing Sierpinski carpet using recursion. In function DrawCarpet in linen, where I redefine a value I got error "To many initializer values". Do somebody know what I'm doing wrong?

typedef float point[2];

float x = 100;
float y = 100;
point a = {  x , y  };
int grade = 4;

void DrawCarpet(point a, GLfloat width, GLfloat grade)
{


    if(grade>0)
    {


        width = width / 3;

        DrawCarpet(a, width, grade - 1);
        a = {  x - width , y };
        DrawCarpet(a, width, grade - 1);
        a = {  x - 2*width , y  };
        DrawCarpet(a, width, grade - 1);
        a = {  x , y-width  };
        DrawCarpet(a, width, grade - 1);
        a =  { x  , y-2*width  };
        DrawCarpet(a, width, grade - 1);
        a = {  x - width , y-width  };
        DrawCarpet(a, width, grade - 1);
        a = {  x - width , y -2*width };
        DrawCarpet(a, width, grade - 1);
        a = {  x -2* width , y -2*width };
        DrawCarpet(a, width, grade - 1);
        a = { x,y };

    } 
}

Answer 1

The type of parameter a is not array of 2 float but rather float* (because of array to pointer decay , also because your function parameter shadows the global variable). So what you're trying to do is assign two values to a pointer variable. Try using a struct with two members as a point type instead, and pass that by reference if you want to assign to it.