C Convert decimal to hexadecimal?

In C, you can use the formatting controller of the printf() function to convert decimal numbers to hexadecimal. Specifically, you can use the %x format controller. For example:

cint decimal_number = 255;

printf("%x", decimal_number);

The above ** converts the decimal number 255 to hexadecimal form and outputs the result ff.

It is important to note that when using the %x format controller, the hexadecimal numeric initials of the output are automatically converted to lowercase. If you need to output letters in uppercase, you can use the %x format control.

It's the reason for using the decimal system, how profound and amazing it is ... I think hexadecimal is better.

In C, you can use the Sprintf function to convert decimal to hexadecimal strings, or you can use the Printf function to convert decimal to hexadecimal and output. Examples of two implementations are given below:

Use the sprintf function.

#include

int main()

int decimal = 255;

char hex[10];

sprintf(hex, "%x", decimal);

printf("decimal %d is equivalent to hexadecimal %s", decimal, hex);

return 0;

The output is:

decimal 255 is equivalent to hexadecimal ff

Use the printf function.

#include

int main()

int decimal = 255;

printf("decimal %d is equivalent to hexadecimal %x", decimal, decimal);

return 0;

The output is:

decimal 255 is equivalent to hexadecimal ff

In the sprintf and printf functions,"%x"Format specifiers are used to convert integers into hexadecimal representations. If you need to output hexadecimal numbers represented by uppercase letters, you can use it"%x"Format specifier.

The method of removing the surplus can be adopted.

Divide a decimal number by 16 to get the quotient and remainder.

Then divide the quotient by 16 to get the new quotient and the balance of the break, and then the new quotient is processed in the same way until the quotient is 0, and then the remainder is combined in reverse order to get the hexadecimal number.

For example, convert the decimal number 1024:

Divide 1024 by 16 to get the quotient 64 and the remainder of the hand attack 0;

Divide 64 by 16 to get the quotient 4 and the remainder 0;

Divide 4 by 16 to get the quotient 0 and the remainder 4.

Combine the remainders in reverse order to get the hexadecimal number 400.

If the remainder is greater than or equal to 10 and less than or equal to 15, the number is converted into a letter (10-a, 11-b, 12-c, 13-d, 14-e, 15-f).

(1) Hexadecimal to decimal method:

Use single digits + tens * 16 + hundreds * 256 + thousands * 4096 +...When multiplied, the number multiplied by the first single digit is 16 times the number multiplied by the number of the last single digit of ten.

The specific cases are as follows:

ab)=a×16+b=(171)

abc)=a×256+b×16+c=(2748)<>

b) The method of decimal to hexadecimal.

Convert decimal to hexadecimal and divide by 16 until the quotient is 0. (The specific usage is shown in the figure below) <>

It is "according to the right". There are example questions in the book, and you can see it at a glance.

The specific algorithm for converting hexadecimal to decimal is:

1. First of all, understand the hexadecimal number (from right to left the number is the 0th, 1st, 2nd......The 0th place has a weight of 16 to the power of 0, the first place has a weight of 16 to the 1st power, and the 2nd place has a weight of 16 to the 2nd power, and so on.

2. Understand that the binary digits represented by ABCDEF are 10, 11, 12, 13, 14, and 15.

3. The formula for converting hexadecimal to decimal is: from right to left, use each number in binary to multiply it by the corresponding power of 16, and then add these numbers together.

Hexadecimal to decimal method: "sum by weight", e.g. hexadecimal: (2af5)h=2*16 3+10*16 2+15*16 1+5*16 0=8192+2560+240+5=10997.

Hexadecimal is a representation of data in a computer. It's not the same as the representation in our daily lives.

It consists of 0-9, a-f, and the letters are not case sensitive. The correspondence with decimal is: 0-9 corresponds to 0-9; a-f corresponds to 10-15; Numbers in base can be represented by numbers of 0 (n-1) and letters a-f over 9.

The decimal system, i.e. full ten into one, full twenty into two, and so on ......According to the right, the first right is 10 0, and the second place is 10 1 ......And so on, the nth digit 10 (n-1), the value of this number is equal to the sum of the value of each bit * the corresponding weight of that bit.

The base system, also known as the carry counting system, is an artificially defined counting method with carry (there are counting methods without carrying, such as the original knotted rope counting method, the "positive" word counting method commonly used when singing tickets, and similar tally mark counting). For any kind of decimal --- base, it means that the number in each position is calculated every x digit. Decimal is every 10 to 1, hexadecimal is 1 to 16, binary is every 2 to 1, and so on, x base is every x round.