#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include <string.h>
int I,A,B,C,L,M,T;
float cm1,m2,km3,M4,g1,kg2,q3,p4,s1,mi2,h3,d4;
float cm2,cm3,cm4,m1,m3,m4,km1,km2,km4,M1,M2,M3,g2,g3,g4,kg1,kg3,kg4,q1,q2,q4,p1,p2,p3,s2,s3,s4,mi1,mi3,mi4,h1,h2,h4,d1,d2,d3;
int choice;
char newusername[25];
char newpassword[25];
char username[25];
char password[25];
int main()
{
    printf("!!! WELCOME TO THE BMI CALCULATOR & UNIT CONVERTER !!!");
    stats:printf("\n\n!!!THE AVAILABLE OPTIONS ARE AS FOLLOWS!!!\n");
    printf("1. UNIT CONVERTER    (PRESS 1)\n");
    printf("2. BMI CALCULATOR    (PRESS 2)\n");
    printf("3. ACCESS LIBRARY    (PRESS 3)\n");
    printf("4. EXIT THE PROGRAM  (PRESS 4)\n");
    printf("\n\n!!!SELECT YOUR DESIRED CHOICE FROM THE OPTIONS ABOVE!!!\n\n");
    scanf(" %d",&I);
    switch(I)
    {
        case (1):
        //UNIT CONVERTER
        printf("\n\n!!!WELCOME TO THE UNIT CONVERTER!!!\n\n");
        printf("\nTHE AVAILABLE UNIT CONVERSION ARE AS FOLLOWS!!!\n");
        printf("1. CONVERSION OF LENGTH  (PRESS 1)\n");
        printf("2. CONVERSION OF MASS    (PRESS 2)\n");
        printf("3. CONVERSION OF TIME    (PRESS 3)\n");
        printf("ENTER YOUR DESIRED OPERATION :");
        scanf("%d",&A);
        switch(A)
        {
        case (1):
            //CONVERSION OF LENGTH
            printf("\n1. CENTIMETERS   (PRESS 1)\n");
            printf("2. METERS        (PRESS 2)\n");
            printf("3. KILOMETERS    (PRESS 3)\n");
            printf("4. MILES         (PRESS 4)\n");
            printf("\n!!!CHOOSE THE UNIT OF CONVERSION FOR LENGTH!!! :");
            scanf("%d",&L);
            switch(L)
            {
                case (1):
                printf("\nEnter the Length in Centimeters: ");
                scanf("%f",&cm1);
                m1=(cm1/100);
                printf("\n%f Centimeters = %f Meters",cm1,m1);
                km1=(cm1/100000);
                printf("\n%f Centimeters = %f Kilometers",cm1,km1);
                M1=(cm1/160934.4);
                printf("\n%f Centimeters = %f Miles",cm1,M1);
                break;
                case (2):
                printf("\nEnter the Length in Meters: ");
                scanf("%f",&m2);
                cm2=(m2*100);
                printf("\n%f Meters = %f Centimeters",m2,cm2);
                km2=(m2/1000);
                printf("\n%f Meters = %f Kilometers",m2,km2);
                M2=(m2/1609.344);
                printf("\n%f Meters = %f Miles",m2,M2);
                break;
                case (3):
                printf("\nEnter the Length in Kilometers: ");
                scanf("%f",&km3);
                cm3=(km3*100000);
                printf("\n%f Kilometers = %f Centimeters",km3,cm3);
                m3=(km3*1000);
                printf("\n%f Kilometers = %f Meters",km3,m3);
                M3=(km3/1.609);
                printf("\n%f Kilometers = %f Miles",km3,M3);
                break;
                case (4):
                printf("\nEnter the Length in Miles: ");
                scanf("%f",&M4);
                cm4=(M4*160900);
                printf("\n%f Miles = %f Centimeters",M4,cm4);
                m4=(M4*1609);
                printf("\n%f Miles = %f Meters",M4,m4);
                km4=(M4*1.609);
                printf("\n%f Miles = %f Kilometers",M4,km4);
                break;
                default:
                printf("\n!!!ERROR!!!\n");
                printf("\nENTER YOUR DESIRED OPTION AGAIN: ");
                scanf("%d",&L);
            }
            break;
            case (2):
            //CONVERSION OF MASS
            printf("\n1. GRAMS      (PRESS 1)\n");
            printf("2. KILOGRAMS  (PRESS 2)\n");
            printf("3. QUINTALS   (PRESS 3)\n");
            printf("4. POUNDS     (PRESS 4)\n");
            printf("\n!!!CHOOSE THE UNIT OF CONVERSION FOR MASS!!! :");
            scanf("%d",&M);
            switch(M)
            {
                case (1):
                printf("\nEnter the Mass in grams: ");
                scanf("%f",&g1);
                kg1=(g1/1000);
                printf("\n%f Grams = %f Kilograms",g1,kg1);
                q1=(g1/100000);
                printf("\n%f Grams = %f Quintals",g1,q1);
                p1=(g1/453.592);
                printf("\n%f Grams = %f Pounds",g1,p1);
                break;
                case (2):
                printf("\nEnter the Mass in Kilograms: ");
                scanf("%f",&kg2);
                g2=(kg2*1000);
                printf("\n%f Kilograms = %f Grams",kg2,g2);
                q2=(kg2/100);
                printf("\n%f Kilograms = %f Quintals",kg2,q2);
                p2=(kg2*2.205);
                printf("\n%f Kilograms = %f Pounds",kg2,p2);
                break;
                case (3):
                printf("\nEnter the Mass in Quintals: ");
                scanf("%f",&q3);
                g3=(q3*100000);
                printf("\n%f Quintals = %f Grams",q3,g3);
                kg3=(q3*100);
                printf("\n%f Quintals = %f Kilograms",q3,kg3);
                p3=(q3*220.462);
                printf("\n%f Quintals = %f Pounds",q3,p3);
                break;
                case (4):
                printf("\nEnter the Mass in Pounds: ");
                scanf("%f",&p4);
                g4=(p4*453.592);
                printf("\n%f Pounds = %f Grams",p4,g4);
                kg4=(p4/2.205);
                printf("\n%f Pounds = %f Kilograms",p4,kg4);
                q4=(p4/220.462);
                printf("\n%f Pounds = %f Quintals",p4,q4);
                break;
                default:
                printf("\n!!!ERROR!!!\n");
                printf("\nENTER YOUR DESIRED OPTION AGAIN: ");
                scanf("%d",&L);
            }
            break;
            case (3):
            //CONVERSION OF TIME
            printf("\n1. SECONDS      (PRESS 1)\n");
            printf("2. MINUTES      (PRESS 2)\n");
            printf("3. HOURS        (PRESS 3)\n");
            printf("4. DAYS         (PRESS 4)\n");
            printf("\n!!!CHOOSE THE UNIT OF CONVERSION FOR TIME!!! :");
            scanf("%d",&T);
            switch(T)
            {
            case (1):
            printf("\nEnter the Time in Seconds: ");
            scanf("%f",&s1);
            mi1=(s1/60);
            printf("\n%f Seconds = %f Minutes",s1,mi1);
            h1=(s1/3600);
            printf("\n%f Seconds = %f Hours",s1,h1);
            d1=(s1/86400);
            printf("\n%f Seconds = %f Day/(s)",s1,d1);
            break;
            case (2):
            printf("\nEnter the Time in Minutes: ");
            scanf("%f",&mi2);
            s2=(mi2*60);
            printf("\n%f Minutes = %f Seconds",mi2,s2);
            h2=(mi2/60);
            printf("\n%f Minutes = %f Hours",mi2,h2);
            d2=(mi2/14400);
            printf("\n%f Minutes = %f Day/(s)",mi2,d2);
            break;
            case (3):
            printf("\nEnter the Time in Hours: ");
            scanf("%f",&h3);
            s3=(h3*3600);
            printf("\n%f Hours = %f Seconds",h3,s3);
            mi3=(h3*60);
            printf("\n%f Hours = %f Minutes",h3,mi3);
            d3=(h3/24);
            printf("\n%f Hours = %f Day/(s)",h3,d3);
            break;
            case (4):
            printf("\nEnter the Time in Day/(s): ");
            scanf("%f",&d4);
            s4=(d4*86400);
            printf("\n%f Day/(s) = %f Seconds",d4,s4);
            mi4=(d4*1440);
            printf("\n%f Day/(s) = %f Minutes",d4,mi4);
            h4=(d4*24);
            printf("\n%f Day/(s) = %f Hours",d4,h4);
            break;
            }
            break;
        }
        break;
        case (2):
        //BMI CALCULATOR
        break;
        case (3):
        //ACCESS THE LIBRARY FOR SAVED DATA
        printf("\n!!!CHOOSE FROM THE OPTIONS BELOW!!!\n");
        printf("1. Create a New Username & Password. (Press 1)\n");
        printf("2. Access The Library.               (Press 2)\n");
        scanf("%d",&C);
        switch(C){
        case (1):
        printf("Enter New Username:");
        scanf("%s",&newusername);
        printf("Enter New Password:");
        scanf("%s",&newpassword);
        break;
        case (2):
        printf("Enter your username:");
        scanf("%s",&username);
        printf("\nEnter your password:");
        scanf("%s",&password);
        if(strcmp(username,"chaitu")==0)
        {
        if(strcmp(password,"123")==0)
        {
        printf("\nWelcome.Login Success!");
        }
        else
        {printf("\nwrong password");}
        }
        else
        {printf("\nUser doesn't exist");}
        break;
        }
        case (4):
        //EXIT THE PROGRAM
        choice = I;
        if(choice=='4')
            {exit(0);}
        break;

        default:
        //DEFAULT ACTION IN CASE WRONG INPUT IS GIVEN.
        printf("!!!ERROR!!!");
        goto stats;
    }
    return 0;
}