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

isdigit function > ctype.h > header files in c Programming
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
Live Example :
void main()
{
char ch = '1';

if( isdigit (ch))
       printf("nThis is Digit");
else
       printf("nThis is not a Digit");
}
Output :  
This is Digit
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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