Question about use constants instead of using hard coded strings

sorry for my poor english.

recently, we've been forced by project development leader to use constants

instead of using hard coded strings.

for instance,

IF GR_ALV->IS_READY_FOR_INPUT( ) EQ 'X'. <------WRONG(X)

IF GR_ALV->IS_READY_FOR_INPUT( ) EQ C_X. <------CORRECT(O)

I know exactly what CONSTANTS meaning

but why should we use constants like C_X????

thanks.

Edited by: Tae-Hwan Shin on Oct 18, 2011 8:58 AM