Code

 Header...
 float myfun(int dim,float ydim[][dim]){
   ... 

»  float x, y, zdim[2][2]={{0}};

»  y=zdim[1]1;
  
»  x=ydim[1]1;
»  return 1;
}

// Stress test: swap variable names
float myfun2 (int ydim,float dim[][ydim]);
float myfun (int ydim,float dim[][ydim]);

 float myfun2(int dim,float ydim[][dim]){
   ... 

»  float x, y, zdim2[2][2]={{0}};
»  float *xp=&x;

»  y=zdim2[1]1;
  
»  x=ydim[1]1;
»  return 1;
}

 int main(){
   ... 

»  float y[3][3];

»  y[1]1=1.414;
  
»  myfun(3, y);
»  myfun2(3, y);
»  return 0;
}