Objective

Implement four bit flag macros in flags.h, then use them in update_flag.

Steps

• Write flags.h and flags.c.
• FLAG(bit) returns an unsigned value with only bit set.
• HAS_FLAG(value, bit) is true when that bit is set in value.
• SET_FLAG(value, bit) returns value with that bit set.
• CLEAR_FLAG(value, bit) returns value with that bit cleared.
• Parenthesise every macro parameter and the complete expansion. Grademe passes expressions, not only variable names.
• update_flag sets the selected bit when enabled is nonzero and clears it when enabled is zero.
• The valid bit range is 0 through 31.

Objective

Implement four bit flag macros in flags.h, then use them in update_flag.

Steps

• Write flags.h and flags.c.
• FLAG(bit) returns an unsigned value with only bit set.
• HAS_FLAG(value, bit) is true when that bit is set in value.
• SET_FLAG(value, bit) returns value with that bit set.
• CLEAR_FLAG(value, bit) returns value with that bit cleared.
• Parenthesise every macro parameter and the complete expansion. Grademe passes expressions, not only variable names.
• update_flag sets the selected bit when enabled is nonzero and clears it when enabled is zero.
• The valid bit range is 0 through 31.