It runs but closes

[emptycl0ud9]

This program should solve for a matrix but I havent started with the main body since it closes when I run it

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

int choice, dmatrix, size;
int quit=0;

main()
{
      matrix:
      printf("Choose the type of MATRIX OPERATION/n");
      printf("/n [1] Find the Determinant/n [2] Cofactor Matrix /n [3] Reduced Echelon Form /n [0]Exit Program");
      scanf("%d", &choice);
      switch(choice)
      {
                    case 1:
                         printf("Enter the size of the matrix (max 5 by 5)");
                         scanf("%n", &dmatrix);
                         do
                         {
                                     if (dmatrix == 1);
                                     printf("INVALID MATRIX SIZE");
                                     goto case 1;
                                     
                                     if (dmatrix ==2);
                                     printf(" enter A11/n");
                                     scanf("
                         getch();
                         break;
                    case 2:
                         printf("");
                         break;
                    case 3:
                         printf("Enter the size of the matrix (max 5 by 5)");
                         break;
                    case 0:
                         quit =50;
                         break;    
                    default:
                         printf("Invalid choice Please Re-enter choice");
                         break;
                         goto matrix;
                         }
                      
                         
}
 

[Moschops]

And why would it stay open?

[emptycl0ud9]

when i run it, it closes immedietly

[MikeyBoy]

What do you see when you run it? Does it print out the text specified in lines 11 and 12? Does it allow you to enter a choice?

Do you get any error messages?

[emptycl0ud9]

when i run it it just closes on the spot

[Moschops]

when i run it, it closes immedietly

So you don't even get to type anything in?

[emptycl0ud9]

yeah nothing i dont know why. but devc doesnt show that i have an error

[Moschops]

If your compiler doesn't complain about line 27:
scanf("
throw it away. The code above cannot compile.

If you're using Dec Cpp from before version 5, also throw it away.

Also, this is C++. Why use printf and scanf when cout and cin are so much safer and easier to use?

[ajh32]

Instead of having that awful goto matrix: (goto is not a good practice to get into). I would suggest that you have something like:

int main()
{
   bool running(true);
   
   while (running)
   {
      system("cls");
      
      // put your printf scanf here
      
      switch(choice)
      {
         case 1:
            // to do
            break;
         case 2:
            // to do
            break;
         case 3:
            // to do
            break;
         case 0:
            running = false;
            break;
         default:
            // to do
      };
   }

   return 0;
}

[emptycl0ud9]

sorry im not that accustomed to use c++ i usually use .c but i need the "goto" syntax for easier use

[ajh32]

sorry im not that accustomed to use c++ i usually use .c but i need the "goto" syntax for easier use

Is it not easy to follow the above code I have pasted with a while() loop? If you think you need goto's then call a function rather than use goto.

[MikeyBoy]

Using "goto" is almost always a terrible idea. ajh32's suggestion is vastly better. C and C++ have perfectly good control structures, including loops, and you should use them.

[ajh32]

... also the main() function should always return an integer back to the OS. Non zero indicates an error, zero indicates to OS that all was OK.