It's "statement exprs": "A compound statement enclosed in parentheses may appear as an expression in GNU C. This allows you to use loops, switches, and local va

It's "statement exprs": "A compound statement enclosed in parentheses may appear as an expression in GNU C. This allows you to use loops, switches, and local variables within an expression. [...] The last thing in the compound statement should be an expression followed by a semicolon; the value of this subexpression serves as the value of the entire construct." [0] [0] https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html