isalpha function > ctype.h > header files in c Programming

---

---

isalpha function > ctype.h > header files in c Programming

---

Syntax	int isalpha (int c)
Header File	ctype.h
Return Value	Return non-zero if character is either alphabet Return zero if character is not alphabet

---

Live Example :

void main()
{
char ch = '1';
if(isalpha(ch))
    printf("\nThis is alphabet character");
else
    printf("\nThis is non alphabet character");
}

---

Output : 

This is not alphabet character

---

Following are alphabet characters :

1. Uppercase Letters [ A-Z]
2. Lowercase Letters [a-z]

Explanation of statement : if(isalpha(ch))

1. character ch is passed to function isalpha
   
2. if ch belongs to the set of alphabet character then it returns positive value 
3. otherwise it returns zero .

Note : 

1. Positive non-zero value given to if block , will result in TRUE condition
2. Zero value given to if block , will result in FALSE condition

Question	How we are passing character value to function , which contradicts to the Given Syntax ?
Answer	We are passing character to function , automatically gets converted into (int) equivalent ascii value

---

Bookmark & Share

---

Tags / Keywords : | check whether entered character is alphabet or not, Ctype.h, isalpha

---