printf and snprintf does not work for float or double variable

[puppies]

When i use "snprintf" in my program on freeRTOS, i find it does not work properly.
So i tried to print the float variable out to check the problem.

printf("temperature: %f\n", 22.5);

But i got these below.

temperature:

Is it due to the toolchain? What can i do to solve this problem?
Much appreciated.

[kriegste]

You need to do something like this.

float temperature = 22.5;
int t = temperature*10;
printf("temperature: %d.%d\n", t/10, t%10);