C language Two integer divides the result is still an integer, not a floating-point number __c language

Note that the result of dividing two integers is still an integer, not a floating-point number.

 

problem Description: Known Celsius temperature (℃) and Fahrenheit temperature (℉) conversion relationship is:

                             

Write a program for converting Celsius temperature (℃) and Fahrenheit temperature (℉) to input Celsius temperature and output Fahrenheit temperature.

input: Randomly enter a Celsius temperature data from the keyboard.

output: Output corresponding Fahrenheit temperature data, retain 3 digits after the decimal point.

Input Sample:

5

Output Sample:

41.000 error code:

#include <stdio.h>
int main () {
	double c,f;
	scanf ("%f", &c);
	f=c*9/5.0+32.0;
	printf ("%.3f", f);
	return 0;
}

The focus seems to be%lf.

#include <stdio.h>
int main () {
	double c,f;
	scanf ("%lf", &c);
	f=c*9.0/5+32.0;
	printf ("%.3lf", f);
	return 0;
}