They are completely different types see standard: 3.9.1 Fundamental types [basic.fundamental] 1 Objects declared as characters char) shall be large enough to store any member of the implementation’s basic character set. If a character from this set is stored in a character object, the integral value of that character object is equal to the value … Read more
As you have commented, the reason is that you use cout to print its content directly. Here I will try to explain to you why this will not work. cout << bottomRGB[0] << endl; Why “cout” works weird for “unsigned char”? It will not work because here bottomRGB[0] is a unsigned char (with value 218), … Read more
The golden rule for writing this line is while ((ch = fgetc(stdin)) != EOF) ch should be int .Your cute trick of making ch unsigned fails because EOF is a signed int quantity. Ok, let’s now go into the depth…… Step 1: ch=fgetc(fp) fgetc() returns -1 (a signed int). By the golden rules of C … Read more
If it exists, uint8_t must always have the same width as unsigned char. However, it need not be the same type; it may be a distinct extended integer type. It also need not have the same representation as unsigned char; for instance, the bits could be interpreted in the opposite order. This is a silly … Read more
Use: cout << “a is ” << hex << (int) a <<“; b is ” << hex << (int) b << endl; And if you want padding with leading zeros then: #include <iomanip> … cout << “a is ” << setw(2) << setfill(‘0’) << hex << (int) a ; As we are using C-style casts, … Read more
cout << a is printing a value which appears to be garbage to you. It is not garbage actually. It is just a non-printable ASCII character which is getting printed anyway. Note that ASCII character corresponding to 1 is non-printable. You can check whether a is printable or not using, std::isprint as: std::cout << std::isprint(a) … Read more
It doesn’t really print a blank, but most probably the ASCII character with value 5, which is non-printable (or invisible). There’s a number of invisible ASCII character codes, most of them below value 32, which is the blank actually. You have to convert aa to unsigned int to output the numeric value, since ostream& operator<<(ostream&, … Read more
That’s a string of 32 characters, being hexadecimal digits. That makes 16 bytes, or 128 bits. m0skit0 told you how to store it in a string. If you actually want to store that in an integer, you’d need something like unsigned long long intvar = strtoull( stringvar, NULL, 16 ) – provided “long long” on … Read more