How to go to the previous line in a C code

Question

If for the following code:

printf(\"HEllo\\n\");    // do not change this line.
printf(\"\\b\\bworld\");

I need an output: Helloworld (In a

Answer 1

How about simply:

printf("Helloworld");

\n is an escape sequence for a new line. Since you want everything to appear on the same line, there's no reason to specify \n.

The problem is you can't reliably move back up a line (using \b) after you've printed a new line. But if you require that there be two lines of code in your source, you can simply omit both escape sequences:

printf("HEllo");
printf("world");

If you're writing a Win32 console application, you can take advantage of the Console Screen Buffer API. The following code will move 1 line up:

printf("HEllo\n");

CONSOLE_SCREEN_BUFFER_INFO coninfo;
HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
GetConsoleScreenBufferInfo(hConsole, &coninfo);
coninfo.dwCursorPosition.Y -= 1;    // move up one line
coninfo.dwCursorPosition.X += 5;    // move to the right the length of the word
SetConsoleCursorPosition(hConsole, coninfo.dwCursorPosition);

printf("world");

Output:

HElloworld