Convert a hexadecimal number to an integer in decimal format.

Source: Internet
Author: User

Previously, the hexadecimal format was converted to decimal format. The hexadecimal format was always first converted to binary format, and then converted to decimal format. Today I see a question: convert a hexadecimal number into an integer. Searching on the internet found that in addition to this conversion, it can also be converted to decimal like binary, for example: Binary 110, it can be 1*2 ^ 2 + 1*2 ^ 1 + 0*2 ^ 0 = 6. In fact, the hexadecimal format is converted to decimal format:

For example, F5 is converted to decimal: F (15) * 16 ^ 1 + 5*16 ^ 0 = 245;

In this way, you can easily write code by converting a hexadecimal number into a decimal number:

String STR = "13abf ";

Intlen = Str. length;

INTSUM = 0;

For (INTI = 0; I <Len; I ++ ){

Char c = Str. charat (len-1-i );

Int n = character. digit (C, 16); // calculates the hexadecimal value of C.

Sum + = N * (1 <(4 * I ));

}

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