How to extract byte data with pointers in the C language?

In C language, data bytes can be extracted using pointers. The specific operation is as follows:

1. Please provide a number.
2. number
3. pointer

int num = 12345678;
unsigned char *ptr = (unsigned char *)#

1. I’m sorry, but I couldn’t find the original sentence that you would like me to paraphrase. Kindly provide the sentence so I can assist you with paraphrasing it.
2. pointer
3. just a number

unsigned char firstByte = *ptr;

1. number
2. pointer

unsigned char secondByte = *(ptr + 1);

Points to note:

1. It is necessary to declare pointer variables with the appropriate type in order to access byte data correctly.
2. To traverse through all the bytes of the data, one can use a loop structure to increment the pointer’s value each time and access the byte data.
3. Attention should be paid to the issue of byte order (big-endian or little-endian) to ensure the correct parsing of byte data.