The difference between %x and %x in C language

In C language, %x prints integers in lowercase hexadecimal form, and %X prints integers in uppercase hexadecimal form.

The difference between %x and %X

In C language, %x and %X are both formats ization placeholder for printing integers in hexadecimal form. The main difference between them is case.

%x

• Print the integer in lowercase hexadecimal form.
• The resulting value always contains lowercase letters.
• For positive integers, the 0x prefix is ​​not automatically appended.
• For negative integers, a 0x prefix is ​​automatically appended, followed by the negative's complement.

%X

• Print the integer in uppercase hexadecimal form.
• The resulting value always contains uppercase letters.
• For positive integers, the 0X prefix is ​​automatically appended.
• For negative integers, a 0X prefix is ​​automatically appended, followed by the negative's complement.

Sample code:

int i = 100;
printf("小写十六进制：%x\n", i);  // 输出：64
printf("大写十六进制：%X\n", i);  // 输出：64

Summary:

• %x in lower case hexadecimal The form prints an integer.
• %X Prints an integer in uppercase hexadecimal form.

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