Adding different types of variables will make some changes to the data type, which is roughly as follows: character type->; Plastic surgery->; -> single precision real number type; Double precision real type, so 194+2.5= 196.5.

"\092" is a string of ***4 characters with a length of 4. As for the number of bytes occupied, it is related to your definition. It is defined that strings are different from string arrays, and the test length is strlen (str). Test bytes with sizeof(str)