It is one of the basic need a program may required i.e clear the console during execution time.
There is function named clrscr() which is included in conio.h and is a nonstandard function and is present in conio.h header file which is mostly used by MS-DOS compilers like Turbo C. It is not part of the C standard library or ISO C, nor is it defined by POSIX.
So what should we use there?
There are two more ways to clear console:
- By Using system(“clear”)
- By using a regex “\e[1;1H\e[2J”
Now question arises which should we use and why:
Using regex is a better way.The reason is its faster execution. By using regex we can perform clear screen operation very fastly in comparion to using system(“clear”).
Below c program will demostrate how fast regex is then the system(“clear”)
The system(“clear”) is included in stdlib.h and also work only in linux system to use this in window use system(“cls”).
geeks for geeks 9999 Time taken by system("clear") 0.934388 Time taken by regex 0.000001
NOTE:The output time may differ but the difference in both time will always be large.And also run this program only in your system’s console not here.
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