Check if next character is a letter?

Im designing a program in which i need to check if the next char taken from a line of input is a letter. How would i do this with just the standard functions?

char letter;
cin >> letter;

if( (letter >= 'A' || letter <='Z') || ( letter >= 'a' || letter <= 'z' ) )
{
//continue as planned
}
else
{
arrgggg!!! not a letter, abort abort!!!!!!
}


or there is a function isalpha( int ) in ctype.h ehich does the same thing

Sorry unregistered, but your code will aways result in the if statement being true. Anything inputed is either greater 'A' or less than 'Z'. You needed an && instead of ||.

Anyways, just use isalpha().