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New Structure Code Question

Question asked by John Justice on Jun 7, 2018
Latest reply on Jun 7, 2018 by John Justice

In something like the string

EulerAngleTypeDef euler_rc, euler_ahrs, euler_rc_fil, euler_rc_y_pre[4], euler_rc_x_pre[4];


What does the [4] do?  I understand in general for declaring a structure but am unclear what the extra [4] does... sets initial value always to 4 maybe?