1
atoi();
itoa();
or forced type conversion, etc.
2
Converted to number 1: 1-'0';//1 is character type
Converted to character 1: '0'+1;//1 is integer type
3
atoi(); characters are converted to numbers
itoa(); numbers are converted to characters
4
‘1’-48;
char(1+48);
5
‘1’-0x30;
char(1+0x30);
6
The difference between the decimal number is 48
7
Look at the ASCII table
8
1=‘1’-‘0’
‘1’=1+‘0’
This is simple enough, don’t remember what the difference is
9
Check the Ascii table
10
1-0=‘1’-‘0’
‘1’=1+‘0’-0