Copter: add floating-point-constant designators

ArduCopter/mode.cpp

@@ -591,7 +591,7 @@ float Copter::Mode::get_pilot_desired_throttle() const
         throttle_in = 0.5f + ((float)(throttle_control-mid_stick)) * 0.5f / (float)(1000-mid_stick);
     }
 
-    float expo = constrain_float(-(thr_mid-0.5)/0.375, -0.5f, 1.0f);
+    const float expo = constrain_float(-(thr_mid-0.5f)/0.375f, -0.5f, 1.0f);
     // calculate the output throttle using the given expo function
     float throttle_out = throttle_in*(1.0f-expo) + expo*throttle_in*throttle_in*throttle_in;
     return throttle_out;

ArduCopter/mode.h

@@ -669,13 +669,13 @@ private:
     void update_height_estimate(void);
 
     // minimum assumed height
-    const float height_min = 0.1;
+    const float height_min = 0.1f;
 
     // maximum scaling height
-    const float height_max = 3.0;
+    const float height_max = 3.0f;
 
     AP_Float flow_max;
-    AC_PI_2D flow_pi_xy{0.2, 0.3, 3000, 5, 0.0025};
+    AC_PI_2D flow_pi_xy{0.2f, 0.3f, 3000, 5, 0.0025f};
     AP_Float flow_filter_hz;
     AP_Int8  flow_min_quality;
     AP_Int8  brake_rate_dps;

ArduCopter/radio.cpp

@@ -206,7 +206,7 @@ void Copter::radio_passthrough_to_motors()
 {
     motors->set_radio_passthrough(channel_roll->norm_input(),
                                   channel_pitch->norm_input(),
-                                  channel_throttle->get_control_in_zero_dz()*0.001,
+                                  channel_throttle->get_control_in_zero_dz()*0.001f,
                                   channel_yaw->norm_input());
 }