sultan mohammed almotairi

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

void calc() {
    char input[25];
    double num = 0.0;
    printf("input:");
    fgets(input, 25, stdin);
    if (input[1] != '.'&&input[2] != '.'&&input[3] != '.') {
        printf("Error number befor [.] exceeds 3 digits");
        return;
    }
    if (strlen(input) > 12) {
        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,20,stdin);
    printf("enter your last name :");
    fgets(lastName, 5, stdin);

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

}

int main() {

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