THE C CHARACTER SET

C uses the uppercase letters A to Z, the lowercase letters a to z, thedigit 0 to 9, and some special characters to form basic program elements (e.g., constants variables, operators, expression) as we
discussed above. The special characters are listed below:

C also uses some combinations of these characters such as \t, \n to
represent special conditions such as horizontal tab and newline
respectively. These character combinations are called escape sequences. Each escape sequence represents a single character,
although it is a combination of two or more characters.