Thread: bad io output

The output I get from this program just shows all zeros, I cant figure out what is wrong as this is how the scanf and printf statements are formatted in the book. Any help please?

Code:

#include <stdio.h>

  double min(double, double);

int main(void)
{
  double first, second, displaylow;

  printf("Please enter 2 floating point numbers: ");
  scanf("%f %f", &first, &second);

  displaylow = min(first, second);

  printf("%f is the lower of the floats entered", displaylow);

  return 0;
}

double min(double one, double two)
{
  if (one > two)
    return two;
  else
    return one;
}

change

Code:

scanf("%f %f", &first, &second);

to

Code:

scanf("%lf %lf", &first, &second);

At least that's what gcc says.

carrotcake1029- Thanks, that fixes the problem on this program. However I tried this fix on my other program that had the same problem and it didnt work. Could I bother for a tad more help?

Code:

#include <stdio.h>

  void larger_of(double *, double *);

int main(void)
{
  double first, second;

  printf("Please enter 2 floating point numbers: ");
  scanf("%lf %lf", first, second);

  larger_of(&first, &second);

  printf("The values entered are now %f and %f", first, second);

  return 0;
} 

void larger_of(double * one, double * two)
{
  if (one > two)
    *two = *one;
  else
    *one = *two;
}

aarrgh *facepalms* thx matsp