The value of '0' equals to 48 ASCII codes, and the value of 0 equals to 0 without quotation marks.

'\ 0' is not an ascii code value. It is a character and its ASCII value is 0.

‘\0‘==0

0 digit 48

The space ASCII code value is 32.

main()
 { 
      char a=‘\0‘;  

if(a==0)   printf("A ASCII is 0\n"); 

if(a==‘ ‘)   printf("A is space\n"); 

     printf("*%c*\n",a); 

     getch(); 
}

Single quotes are characters
Double quotation marks are strings
No number is added.

Single quotes indicate zero characters, that is, char type '0' and zero characters

The zero value without quotation marks indicates that the int Type 0 is zero.

In a computer, all data is stored and computed in binary notation,
Likewise, 52 letters (including uppercase letters), numbers such as A, B, C, and D, and numbers such as 0, 1, and 2
There are also some commonly used symbols (such as *, #, @, and so on) stored in a computer, which must also be represented by binary numbers,

And the specific number used to represent which symbol, of course, everyone can agree on their own set (this is called encoding), and if you want to communicate with each other without causing confusion,
Then everyone must use the same encoding rules, so the relevant standardization organizations in the United States issued the so-called American Information Exchange Standard code, which uniformly specifies which binary number is used for the above commonly used symbols. */

Char;
Int I;
Cin>;
I =;
Cout <I; then youInput 0You do not need to add single quotes.The output is 48.