Thread: Help with Program

Hello I'm new to the forum and to to C programming as well. I'm having a little bit of a problem with my code. You see, my program is an enrollment system and asks which subject you want to enroll. But every time i run the code and compute for the total, the addition seems wrong. Please help

here's my code

Code:

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int n,none,ntwo,nthree,Total;
    float Algebra,Trigonometry,Calculus,Engiana,Physics;
    char password[20],username[8];
    Algebra = 100;
    Trigonometry = 300;
    Calculus = 500;
    Engiana = 750;
    Physics = 1500;
    Total = (none+ntwo+nthree);


    printf("Welcome to the Enrollment System \n");
    printf("Here is the list of Available Subjects \n");
    printf("\n");
    printf("Course Code         Price\n");
    printf("\n");
    printf("1. Algebra             %.2f \n",Algebra);
    printf("2. Trigonometry        %.2f \n",Trigonometry);
    printf("3. Calculus            %.2f \n",Calculus);
    printf("4. Engiana             %.2f \n",Engiana);
    printf("5. Physics             %.2f \n",Physics);
    
    printf("You can only select three courses to enroll for the Term \n");
    printf("\n Select First Course to Enroll \n");
    scanf("%d", &none);
 
     switch(none) 
    {
             case 1: printf(" You Enrolled Algebra %.2f \n",Algebra); break; //if conditions met , immediately goes to system pause
             case 2: printf(" You Enrolled Trigonometry %.2f \n", Trigonometry); break; //if conditions not met goes to another case
             case 3: printf(" You Enrolled Calculus %.2f \n", Calculus); break;
             case 4: printf(" You Enrolled Engiana %.2f \n", Engiana); break;
             case 5: printf(" You Enrolled Physics %.2f \n", Physics); break;
             default: printf(" The Course you entered is not valid \n"); break;
             }
                printf("\n Select Second Course to Enroll \n");
                scanf("%d", &ntwo);
                
              switch(ntwo) 
    {
             case 1: printf(" You Enrolled Algebra %.2f \n",Algebra); break; //if conditions met , immediately goes to system pause
             case 2: printf(" You Enrolled Trigonometry %.2f\n", Trigonometry); break; //if conditions not met goes to another case
             case 3: printf(" You Enrolled Calculus %.2f\n", Calculus); break;
             case 4: printf(" You Enrolled Engiana %.2f\n", Engiana); break;
             case 5: printf(" You Enrolled Physics %.2f \n", Physics); break;
             default: printf(" The Course you entered is not valid \n"); break;
             }
                 printf("\n Select Third Course to Enroll \n");
                 scanf("%d", &nthree);
              switch(nthree) 
    {
             case 1: printf(" You Enrolled Algebra %.2f \n",Algebra); break; //if conditions met , immediately goes to system pause
             case 2: printf(" You Enrolled Trigonometry %.2f \n", Trigonometry); break; //if conditions not met goes to another case
             case 3: printf(" You Enrolled Calculus %.2f \n", Calculus); break;
             case 4: printf(" You Enrolled Engiana %.2f \n", Engiana); break;
             case 5: printf(" You Enrolled Physics %.2f \n", Physics); break;
             default: printf(" The Course you entered is not valid \n"); break;
             }
  printf("Total Tuition Price = %.2f \n",Total);
system("PAUSE");
return 0;
}