Add a file of numbers togeather

gistfile1.cpp

int getTotal(char *nameOfFile) 
{
    FILE * fin = fopen(nameOfFile, "r"); //this can be done in one line
    int total=0;
    int c;
    
    if(fin == NULL)
        perror("Error opeining file");
    
    while((c = fgetc(fin)) != EOF)
    {
        //fgetc will read newlines which are at the end of every line
        //the while loop does not exit before the \n is read
        if(c == '\n')
            break;
            
        total += (int)(c - '0');
        //the - '0' or 48 is what changes an ascii value to integer val
        
        /*The reason atoi doesn't work in this case is because
        atoi takes a NULL-terminated character pointer.
        
        In this case you are only reading a single char at a time
        so atoi gives you a segmentation fault*/
    }
    return total;
}

int main(int argc, char *argv[])
{
    int total;
    total = getTotal(argv[1]);
    printf("The Total is: %d\n", total);
    return 0;
}