c - What is the scope of variables, declared in a "for" condition? - 


void main(void){     for(int i;;);     for(int i;;); }

is valid c code? scope of i?

c99 6.8.5.3 the statement

the statement 

for (clause-1 ;expression-2 ;expression-3 )statement

behaves follows: expression expression-2 controlling expression evaluated before each execution of loop body. expression expression-3 evaluated void expression after each execution of loop body. if clause-1is declaration, scope of variables declares remainder of declaration , entire loop, including other 2 expressions; reached in order of execution before first evaluation of controlling expression. if clause-1 expression, evaluated void expression before first evaluation of controlling expression.

also note feature valid since c99. in other words, can't declare variable in first statement in for loop in c89.


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