It checks if character is alphabetic.
Following is the declaration for std::isalpha.
int isalpha ( int c );
int isalpha ( int c );
c − Character to be checked, casted to an int, or EOF.
It returns a value different from zero.
No-throw guarantee − this function never throws exceptions.
In below example for std::isalpha.
#include <stdio.h> #include <ctype.h> int main () { int i=0; char str[]="C++"; while (str[i]) { if (isalpha(str[i])) printf ("character %c is alphabetic\n",str[i]); else printf ("character %c is not alphabetic\n",str[i]); i++; } return 0; }
The sample output should be like this −
character C is alphabetic character + is not alphabetic character + is not alphabetic