How can i use '%dsomething' %(var)

Answer 1

I guess this is python? Those are format specifiers. Use %d for integers, %f for floats and %s for anything else.

https://code.sololearn.com/cSQwuDeqeg4t/?ref=app

/Edit: There's also %x/%X for hexadecimals with lower/uppercase letters

Answer 2

From where did you learn this function?