How to check whether a char is digit or not in Objective-C?

Question

I need to check if a char is digit or not.

NSString *strTest=@\"Test55\";
char c =[strTest characterAtIndex:4];

I need to find out if \'c\' is

Answer 1

In standard C there is a function int isdigit( int ch ); defined in "ctype.h". It will return nonzero (TRUE) if ch is a digit.

Also you can check it manually:

if(c>='0' && c<='9')
{
  //c is digit
}