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 |
|
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 :
- Uppercase Letters [ A-Z]
- Lowercase Letters [a-z]
Explanation of statement :
if(isalpha(ch))
- character ch is passed to function isalpha
- if ch belongs to the set of alphabet character then it returns positive value
- otherwise it returns zero .
Note :
- Positive non-zero value given to if block , will result in TRUE condition
- 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 |