clrscr(); equivalent in Code::Blocks

The easiest most straightforward way is to just do it through system function call:

#include <stdlib.h>

int main()
{
  system("cls");
}

If you want to do it programmatically MSDN shows how here.

Note that there is no standard function provided by C++ for clearing the console. Some compilers, like borland, provides it as a non-standard function for convenience but it's not portable between different compilers.

This is actually a quite simple problem. All you have to do is use printf. You don't even need printf or any headers, for that matter.

printf("\e[1;1H\e[2J");

The \e[1;1H sets the screen to the 1st row and 1st column. the 2J overwrites all characters currently on the screen.

You can also use this:

write(0,"\e[1;1H\e[2J",12);

Then you don't need stdio.h.

You can use the OS commands to clear the contents of the console.

#include<stdlib.h>
int main(){

system("cls");   //For windows
system("clear"); //For Linux

}