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

void clear_standard_input_line(void);
void get_double_int_input(void);

int main(void) {
  get_double_int_input();
  return 0;
}

void get_double_int_input(void) {
  double x = 0.0;
  int i = 0, input_result;


  do {
    // Prompting for input of a double and an int:
    printf("Enter a double and an integer:\n");
    input_result = scanf("%lf %d", &x, &i);  

    if (input_result != 2){
       clear_standard_input_line();
       printf("Problems. Try again\n");
    }
  }  while (input_result != 2);

  // Proceed - input OK because input_result == 2;
  printf("x = %f, i = %d\n", x, i);
}

void clear_standard_input_line(void){
  int ch;
  while ((ch = getchar()) != '\n' && ch != EOF);
}