Page 22 - PROGRAMMING IN C_Neat

 Example 2:
c = ‘6’; Output:
int n = isalpha(c); n = 0

3. isupper():
 Used to check whether a given character is in upper case or not.
 General Form:

int isupper(c);

 Example 1:
c = ‘K’; Output:
int n = isupper(c); n = 1 (non-zero)

 Example 2:
c = ‘k’; Output:
int n = isupper(c); n = 0

4. islower():
 Used to check whether a given character is in lower case or not.
 General Form:

int islower(c);

 Example 1:
c = ‘k’; Output:
int n = islower(c); n = 1 (non-zero)

 Example 2:
c = ‘K’ Output:
int n = islower(c); n = 0

5. ispunct():
 Used to check whether a given character is a punctuation character or not.
 General Form:

int ispunct(c);

 Example 1:
c = ‘.’; Output:
int n = ispunct(c); n = 1 (non-zero)

 Example 2:
c = ‘K’; Output:
int n = ispunct(c); n = 0
_______________________________________________________________________________________

14. Explain storage classes. *

Storage Classes:
 Storage class defines the scope and lifetime of a variable.
 Scope of Variable – how widely a variable is known among the functions in a program.
 Lifetime of Variable – how long a variable retains its value.