Introduction - If you have any usage issues, please Google them yourself
a) to the left and right, respectively, the alignment of the output integer, the domain width is 12 b) in octal, decimal, hexadecimal, input/output integer c) realization of fixed-point floating-point format and the format of the index of input/output and specify the precision, adjusted according to actual situation, until satisfied d) to read into the character string array variable input from the keyboard, the space requirements and all of the input string read to the end of carriage return line feed