Clarity : Convention « Language « C Tutorial

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2. Language
3. Convention

/* poor programming practice */    

    temp = box_x1; 

    box_x1 = box_x2;   

    box_x2 = temp; 

    temp = box_y1; 

    box_y1 = box_y2;   

    box_y2 = temp;

A better version would be:

/* 

    * Swap the two corners     

    */ 
      

    /* Swap X coordinate */    

    temp = box_x1; 
    box_x1 = box_x2;   
    box_x2 = temp; 

    /* Swap Y coordinate */    
    temp = box_y1; 
    box_y1 = box_y2;   
    box_y2 = temp;