Challenge #1

Q1 :

#include <stdio.h>
#include <stdlib.h>

#define MAXLEN 11


int countFunc(char s[], int maxlen) {
    char ch;
    int i , j;
    int chars_remain;
    i = 0;
    j = 0;
    chars_remain = 1;
    while (chars_remain) {
        ch = getchar();
        if ((ch == '\n') || (ch == EOF)) {
            chars_remain = 0;
        }

        else if (i < maxlen - 1) {
            s[i] = ch;
            i++;
        }
    }
    s[i] = '\0';
    return i;
}



int main() {

    char inputstr[10];
    float input;
    float result;
    int resultint;
    int result2;
    int c = 0;
    printf("Enter a positive decimal number :");
    countFunc(inputstr , MAXLEN);
    input = atof(inputstr);

    while (input >= 1 ){
    input = input / 10 ;
    c ++;

    }
    if (c >= 3){
    printf("You've Entered an Invalid Numbered , numbers brfore [.] are more than 3");
    }
    else{

    printf("%f" , input);
    result = input * (22 / 7);
    printf("The result of * (22/7) is %.7f", result);
    resultint = (int)result;
    result2 = result - 3;
   result2 = 10 % result2;
    if ((resultint % 2 == 0 ) && (result2 == 0)) {
        printf("%d is even. \n Error can't devide by Zero!", resultint);
    }
    else if ((resultint % 2 == 0) &&( result2 != 0)){
        printf("%d is even.", resultint);
    }
    else {
        printf("%d is an odd", resultint);
    }
}

}

 ///////////////////////////////////////////////////////

Q 2 :


#include <stdio.h>

int main() {

    char name[30];
    char f [2] ;
    char agestr[3];
    char snumberstr[8];
    int age = 0 ;
    int snumber = 0;

    printf("Enter Your name :\n");
    readln(name, 10);
    /*fgets(name, 30, stdin);
    fflush(stdin);*/

    printf("Enter Your Favorite Letter : \n");
    readln(f, 2);
    /*fgets( f , 2 , stdin);
    fflush(stdin);*/

    printf("Enter Your Age :\n");
    readln(agestr, 3);
    age = atoi(agestr);
    /*fgets(agestr, 3 , stdin);*/
    //fflush(stdin);

    printf("Enter Your Secret Number :\n");
    readln(snumberstr, 3);
    //snumber = atoi(snumberstr);
    /*fgets(snumberstr, 7 , stdin);
    fflush(stdin);*/

    if ((strcmp(f,"A") == 0) && (age >= 24) && (age < 27) && (snumberstr == "123456")) {
        printf("Access granted");
    }

    printf("Name : %s  , Fav Letter : %s , Age : %d , Secret Number : %s ", name, f, age, snumberstr);
}

int readln(char s[], int maxlen) {
    char ch;
    int i;
    int chars_remain;
    i = 0;
    chars_remain = 1;
    while (chars_remain) {
        ch = getchar();
        if ((ch == '\n') || (ch == EOF)) {
            chars_remain = 0;
        }
        else if (i < maxlen - 1) {
            s[i] = ch;
            i++;
        }
    }
    s[i] = '\0';
    return i;
}