[Dev-C++] question about file

[Gabriel A. <gab...@ud...>]

Hi!!
I made a source code in C for read numbers from a file, plus them and show
the result on screen.This is the code.

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

int main()
{
    FILE *nombre;
    int c,a=0;

    nombre = fopen("Prueba.txt", "r");

    if (nombre == NULL)
    {
        printf("El archivo no existe \n");
        exit (EXIT_FAILURE);
    }
    else
    {
        do
        {
            c = getc(nombre);
            a=a +c;

        }
        while (c != EOF);
    }
    printf("%d",a);
    fclose(nombre);

    return EXIT_SUCCESS;
}

I don't know why this code doesn't work. The file "prueba.txt" contains
the numbers 2 3 and 3.The program must do "2+3+3" and show on screen "8"
but i don't know what's wrong, the program shows "151".

Help me please!

Anybody have a good day!