Tại thời điểm này, mỗi cột trừ có thể diễn ra, và sự khác biệt là B494H. Nhớ lớp học của bạn mưu, không rơi vào rut tư duy cũ, gạch bỏ 10, làm cho nó một 9. "Trong thế giới của hệ thập lục phân, 10H -1 = F. Các đường ra 10, làm cho nó một chí nếu bạn có một máy tính hex hoặc một máy tính màn hình lục giác | Block Markers Block markers are used to specify the beginning and end of text blocks. There are only two of these markers B and K and in consequence only one block may be marked within a file at any given time. The block markers are invisible and do not appear on your screen in any way. If both are present in a file however all the text between them the currently marked block is shown as highlighted text. Placing each block marker is a two-character control keystroke pressing Ctrl K B places the B marker the shortcut is F7. Pressing Ctrl K K places the K marker the shortcut is F8. Note the two function key shortcuts which are extremely convenient and fast. A marker is placed at the cursor position and remains there until you move it elsewhere. You cannot delete or remove a marker once placed although you can hide the block of text that lies between the markers which effectively gets the markers out of the picture. See below for more on hiding marked blocks. Moving the Cursor to a Block Marker There are also commands to move the cursor to the block markers pressing Ctrl Q B moves the cursor to the B marker while pressing Ctrl Q K moves the cursor to the K marker. Hiding and Unhiding Blocks of Text The major use of markers however is to define a block of text. There are a number of commands available in JED s editor that manipulate the text that lies between the B and K markers. You probably noticed while experimenting with setting markers that as soon as you positioned both the B and K markers in a file the text between them became highlighted. The highlighted text is a marked text block. As we mentioned before there is no way to remove a marker completely from a file once it has been set. You can however suppress the highlighting of text between the two markers. This is called hiding a block pressing Ctrl K H will hide a block of text. Remember that the markers are still there. Ctrl K H is a toggle. You invoke it once to hide a block and you can invoke it a second
