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

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Syntax	int isdigit (int c)
Header File	ctype.h
Return Value	Return non-zero if c is  digit Return zero if c is not digit

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Live Example :

void main()
{
char ch = '1';
if( isdigit (ch))
       printf("\nThis is Digit");
else
       printf("\nThis is not a Digit");
}

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Output : 

This is Digit

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Explanation of statement : if(isdigit(ch))

1. character ch is passed to function isdigit
2. if ch belongs to the set of digits[0-9] then it returns non-zero 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

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