sultan mohammed almotairi

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
//Q1

void calc() {
	char input[25];
	int length ;
	double num = 0.0;
	printf("input:");
	fgets(input, 25, stdin);
	if (input[1] == '.') {
		length = 10;
	}
	else if (input[2] == '.') {
		length = 11;
	}
	else if (input[3] == '.') {
		length = 12;
	}
	else {
		printf("Error number befor [.] exceeds 3 digits");
	}
	if (strlen(input) > length) {
		printf("Error number after [.] exceeds 8 digits");
		return;
	}

	num = atof(input);
	double equation = num * (22 / 7);

	int equationAsInt = equation;

	printf("%.8lf * (22/7) = %.8lf \n",num, equation);

	if (equationAsInt % 2 == 0) {
		printf("%d is even\n", equationAsInt);
		equationAsInt--;
		printf("\n%d\n", equationAsInt % 10);

	}
	else
	printf("%d is odd\n", equationAsInt);

	if (equationAsInt == 3) {
			printf("can't divide over 0\n");
			return;
	}
	int mod = 10 % equationAsInt;
	printf(" 10 mod %d = %d\n", equationAsInt ,(10%equationAsInt));
}

//Q2
void auth() {
	char name[10];
	char letter = ' ' ;
	int age =0;
	int secretNumber =0;

	printf("enter your name :");
	fgets(name, 10, stdin);
	fflush(stdin);
	printf("enter your name favotite letter:");
	scanf_s("%c", &letter,2);
	fflush(stdin);
	printf("enter your age :");
	scanf_s("%d", &age);
	fflush(stdin);

	printf("enter your secret number :");
	scanf_s("%d", &secretNumber);

	if (letter == 'A' && age >= 24 && age < 28 && secretNumber == 123456) {
		printf("access graned\n");
		printf("name : %s\n", name);
		printf("letter:%c\n", letter);
		printf("secret numper : %d\n", secretNumber);
		printf("age %d\n", age);
		return;
	}
	printf("name : %s\n", name);
	printf("letter:%c\n", letter);
	printf("secret numper : %d\n", secretNumber);
	printf("age %d\n", age);
}

void bonus() {
	char firstName[5];
	char null[20];
	char lastName[5];

	// fgets(null, 20, stdin); //uncomment this one if you are calling other function in the main
	printf("enter your name :");
	fgets(firstName, 5, stdin);
	fgets(null,30,stdin);
	printf("enter your last name :");
	fgets(lastName, 5, stdin);

	printf("Hello %s %s",firstName,lastName);

}

int main() {

	calc();
	//auth();
	//bonus();
	return 0;
}