Cleaned up name function + email function

-------------- cut and paste the code below into your editor -----------------------

#include <string.h>
#include <stdio.h>
#include <ctype.h>

int getEmail(char * userEmail);
int getName(char * name, char * prompt);
int getPhoneNumber(char * userPhone);

void main()
{
	char userEmail[80];
	char firstName[80];
	char lastName[80];
	char userPhone[80];
	int nameValid;
	int emailValid;

	do {
		nameValid = getName(firstName,"Enter first name: ");
		if (nameValid != 1) {
			printf("You entered an invalid name, try again\n");
		}
	}
	while (nameValid == 0);

	do {
		nameValid = getName(lastName,"Enter last name: ");
		if (nameValid != 1) {
			printf("You entered an invalid name, try again\n");
		}
	}
	while (nameValid == 0);

	// to get here, we now have a good first and last name
	do {
		emailValid = getEmail(userEmail);
		if (emailValid != 1) {
			printf("You entered an invalid email, try again\n");
		}
	}
	while (emailValid == 0);
}

int getName(char * charArray, char * msg)
{
	int entryValid = 1;  // presume entry is valid until we disprove it
	int entryLength,i;

	printf(msg);
	gets(charArray);
	printf("You entered: %s\n",charArray);
	// strlen gives the length of an array of characters
	entryLength = strlen(charArray);   // "John" strlen = 4

	// if user just pressed 'enter', this is not valid
	if (entryLength == 0) {
		return 0;
	}

	// to get here, something must have been entered
	// look at each character individually
	entryValid = 1;
	for (i = 0; i < entryLength; i++) {        // "John" i = 0,1,2,3
		// if a space is in the name, invalidate it
		if (charArray[i] == ' ') {
			entryValid = 0;
		}
		// check if entry is a character
		// if (!x) is the same as if (x == 0)
		if (!isalpha(charArray[i])) {  // !0  is equal to 1
			entryValid = 0;
		}
	}

	return entryValid;

}

int getEmail(char * charArray)
{
	int entryValid = 1;  // presume entry is valid until we disprove it
	int entryLength,i;

	printf("Enter the email address: ");
	gets(charArray);
	printf("You entered: %s\n",charArray);
	// strlen gives the length of an array of characters
	entryLength = strlen(charArray);   // "John" strlen = 4

	// if user just pressed 'enter', this is not valid
	if (entryLength == 0) {
		return 0;
	}

	// to get here, something must have been entered
	// look at each character individually
	// valid email rules:
	// must not contain spaces
	// must contain both the @ and the '.'
	entryValid = 1;
	
	// strchr(array,character) returns pointer to character in the array
	if ( !strchr(charArray,'@') || !strchr(charArray,'.') || strchr(charArray,' ')) {
		entryValid = 0;
	}

	return entryValid;
}