char string[] = "Hello";
char *ptr;
fr ( ptr = string; *ptr; ptr++ ) {
    do_something_with( *ptr ); // This is a single char
}

##</code><code>##

foreach my $char ( split //, $string ) { ... }
while ( $string =~ /(.)/g ) { my $char = $1; ... }
for ( my $i = 0; $i <= length $string; $i++ ) { my $char = substr( $string, $index, 1 ); ... }