Ideas for error checking from command line
I am trying to read three doubles from a user's input on the command line. However, my error checking is something to be desired. If I don't enter the correct number of doubles or don't enter a double the program goes into an infinite loop. Here is the main which is handling the I/O:
Code:
int main() {
double a, b, c, x1, x2;
int qret, count;
while(1) {
printf("Enter variables for quadratic equation: ");
if( (count = scanf("%lf %lf %lf", &a, &b, &c)) != 3) {
printf("Invalid Input: Format Is <double> <double> <double>\n");
printf("%d \n", count);
}
else if((qret = qsolver(a, b, c, &x1, &x2)) == 3) {
printf("Error Value: %d\n", qret);
printf("X1 = %lf X2 = %lf\n\n", x1, x2);
}
}
return 0;
}