An integer is a number with no fractional part; it can be positive, negative or zero. In ordinary usage, one uses a minus sign to designate a negative integer. However, a computer can only store information in bits, which can only have the values zero or one. We might expect, therefore, that the storage of negative integers in a computer might require some special technique. As you might imagine, an unsigned integer is either positive or zero. Consider a single digit decimal number: In a single decimal digit, you can write a number between 0 and 9. In two decimal digits, you can write a number between 0 and 99, and so on. Since nine is equivalent to 10¹ - 1, 99 is equivalent to 10² - 1, etc. In n decimal digits, you can write a number between 0 and 10ⁿ - 1. So, analogously, in the binary number system, An unsigned integer containing n bits can have a value between 0 and 2ⁿ - 1 (which is 2ⁿ different values).

No spaces are allowed in the variable names.

The prefix 0 in an integer value indicates octal value. In octal value use of 8 and 9 is not allowed and hence the error.

Since the ASCII value of G is 71 and the garbage value if A is 65 and hence the difference is 6.

As octal 65 ( 065 ) is equivalent of decimal value 53.

Because 'x'-'w' = 120-119. And hence 1/3 results in 0(integer division)

The first character must be a letter or special symbol underscore( _ ).

\\n - newline - printf("\\nab"); - Prints 'ab'
\\b - backspace - printf("\\bsi"); - firstly '\\b' removes 'b' from 'ab ' and then prints 'si'. So after execution of printf("\\bsi"); it is 'asi'.
\\r - linefeed - printf("\\rha"); - Now here '\\r' moves the cursor to the start of the current line and then override 'asi' to 'hai' .

The following table provides the details of standard integer types with their storage sizes and value ranges −

Type	Storage size	Value range
char	1 byte	-128 to 127 or 0 to 255
unsigned char	1 byte	0 to 255
signed char	1 byte	-128 to 127
int	2 or 4 bytes	-32,768 to 32,767 or -2,147,483,648 to 2,147,483,647
unsigned int	2 or 4 bytes	0 to 65,535 or 0 to 4,294,967,295
short	2 bytes	-32,768 to 32,767
unsigned short	2 bytes	0 to 65,535
long	4 bytes	-2,147,483,648 to 2,147,483,647
unsigned long	4 bytes	0 to 4,294,967,295