20241114_FSST-MG.c

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


int endsIn(char email[], char ending[]) {
	int lenEnding = strlen(ending) - 1, lenEmail = strlen(email) - 1;
	for (int i = 0; i <= lenEnding; i++)
		if (email[lenEmail - i] != ending[lenEnding - i])
			return 0;
	return (email[lenEmail-lenEnding-1] != '@');
}

void enter_and_check_email(char email[]) {
	printf("Pleas Enter a E-Mail Address: ");
	gets_s(email, 200);
	int isTrue = 1;

	while (isTrue) {
		int len = strlen(email);
			if ((endsIn(email, ".at") == 0) && (number_of_ats == 0)) {
				printf("Not Vaild !!\n Please Reenter: ");
				for (int i = 0; i < len; i++)
					email[i] = 0;
			}
			else
				isTrue = 0;

	}
	printf("E-Mail is Valid");
}



int number_of_ats(char email[]) {
	int count = 0;
	for (int i = 0; i < strlen(email); i++)
		if (email[i] == '@')
			count++;
	return (count == 1) && (email[0] != '@');
}


int main(void) {
	char email[200];
	enter_and_check_email(email);

	return 0;
}