The for statement
for ( init-statement conditionopt ; expressionopt ) statement
is equivalent to
{
init-statement
while ( condition ) {
statement
expression ;
}
}
except that names declared in the init-statement are in the same declarative region as those declared in the condition, and except that a continue in statement (not enclosed in another iteration statement) will execute expression before re-evaluating condition. [ Note: Thus the first statement specifies initialization for the loop; the condition ([stmt.select]) specifies a test, sequenced before each iteration, such that the loop is exited when the condition becomes false; the expression often specifies incrementing that is sequenced after each iteration. — end note ]
2 #Either or both of the condition and the expression can be omitted. A missing condition makes the implied while clause equivalent to while(true).
3 #If the init-statement is a declaration, the scope of the name(s) declared extends to the end of the for statement. [ Example:
int i = 42; int a[10]; for (int i = 0; i < 10; i++) a[i] = i; int j = i; // j = 42
— end example ]
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