02-19-2013
Function to Check if string input from user is alphabetic only
Good Evening. I'm new to C. Can you please help me.
I'm creating an error checking function, user will input a string, this will check if the input is all alphabet or all letters only. If there is a digit or other special char, it will print Error then ask input from user again.
Here's my code. I don't know what's wrong
int isValid (const char str[], const int max) {
int i;
for (i=0; i<= max; i++) {
if (isdigit(str[i])) {
printf("Letters and spaces are only allowed\n");
return 1;
}
else {
return 0;
}
}
}
I'm from the Philippines. Thank you very much.
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LEARN ABOUT REDHAT
addstr
curs_addstr(3X) curs_addstr(3X)
NAME
addstr, addnstr, waddstr, waddnstr, mvaddstr, mvaddnstr, mvwaddstr, mvwaddnstr - add a string of characters to a curses window and advance
cursor
SYNOPSIS
#include <curses.h>
int addstr(const char *str);
int addnstr(const char *str, int n);
int waddstr(WINDOW *win, const char *str);
int waddnstr(WINDOW *win, const char *str, int n);
int mvaddstr(int y, int x, const char *str);
int mvaddnstr(int y, int x, const char *str, int n);
int mvwaddstr(WINDOW *win, int y, int x, const char *str);
int mvwaddnstr(WINDOW *win, int y, int x, const char *str, int n);
DESCRIPTION
These routines write the characters of the (null-terminated) character string str on the given window. It is similar to calling waddch
once for each character in the string. The four routines with n as the last argument write at most n characters. If n is -1, then the
entire string will be added, up to the maximum number of characters that will fit on the line, or until a terminating null is reached.
RETURN VALUE
All routines return the integer ERR upon failure and OK on success (the SVr4 manuals specify only "an integer value other than ERR") upon
successful completion.
NOTES
Note that all of these routines except waddstr and waddnstr may be macros.
PORTABILITY
All these entry points are described in the XSI Curses standard, Issue 4. The XSI errors EILSEQ and EOVERFLOW, associated with extended-
level conformance, are not yet detected.
SEE ALSO
curses(3X), curs_addch(3X).
curs_addstr(3X)