Hello. I have a question about c language coding.
#include <stdio.h>
int main(void)
{
double c, f;
printf("Enter a Fahrenheit value: ");
scanf_s("%lf", &f);
c = 5.0 / 9.0 * (f - 32.0); // <<<---
printf("C" value is %lf degrees\n", c);
return 0;
}
When I first wrote the code, I wrote c = 5/9 * (f-32); and the result was
Enter a Fahrenheit value: 100
Celsius is 0.000000 degrees.
That's what it says.
I wonder why I have to write down the decimal point to get the result.
c
The compiler of language C recognizes 5 as int type and 5.0 as double type.
Therefore, 5/9 is recognized as an int-type divided by int-type, and the division between int-type takes only the share, so the result of 5/9 becomes 0. Eventually, 5/9*(f-32) became 0*(f-32) and the result became 0.
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