8 Statements [stmt.stmt]

8.7 Jump statements [stmt.jump]

8.7.2 The continue statement [stmt.cont]

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The continue statement shall occur only in an iteration-statement and causes control to pass to the loop-continuation portion of the smallest enclosing iteration-statement, that is, to the end of the loop.
More precisely, in each of the statements 
while (foo) {
  {
    // ...
  }
contin: ;
}

do {
  {
    // ...
  }
contin: ;
} while (foo);

for (;;) {
  {
    // ...
  }
contin: ;
}
a continue not contained in an enclosed iteration statement is equivalent to goto contin.