How to cut decimal off without rounding in C

Question

How do I cut off decimal places in C without rounding?

For example if the number is 4.48

it will just show 4.4

%.1f

Answer 1

This should work

double d = 4.48;
d *= 10.;
int i = d;
d = (double) i / 10.; 

Answer 2

Here is a simple way:

printf("%.1f",trunc(x*10.0)/10.0);

Answer 3

If your compiler supports C99, you should be able to use trunc() and friends:

float f = 4.56f;
f = truncf(f * 10.0) / 10.0;

Answer 4

float myval = 4.48;
float tr = ((int)(myval*10)) / 10.0;

Answer 5

You can (ab)use the fact that integer division truncates and doesn't round:

float original = 4.48;

int tmp = original * 10; // 44.8 truncated to 44

float truncated = tmp / 10.0; // 4.4