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In 2 cases IDE highlights '111' as a string. int main() { long a0 = 1'111'111; // OK long a1 = 0x1'111'111; // bug long a2 = 0b1'111'111; // bug return 0; } Really 1'111'111, 0x1'111'111 and 0b1'111'111 is a numbers.