十进制、二进制、八进制、十六进制
A decimal number,with no prefix
A binary number,with a 0b prefix
An octal number,with a 0o prefixA hexadecimal number,with a 0x prefix
Decimal floats can also have an optional exponent,indicated by an uppercase or lowercase e;
Hexadecimal floats must have an exponent,indicated by an uppercase or lowercase p.
十进制指数
For decimal numbers with an exponent of exp,the base number is multiplied by 10exp
1.25e2 means 1.25 x 102,or 125.0.
1.25e-2 means 1.25 x 10-2,or 0.0125.
十六进制指数
For hexadecimal numbers with an exponent of exp,the base number is multiplied by 2exp:
0xFp2 means 15 x 22,or 60.0.
0xFp-2 means 15 x 2-2,or 3.75.
