Fix warnings

core/src/gui/main_window.cpp

@@ -412,7 +412,7 @@ void drawWindow() {
         if(ImGui::CollapsingHeader("Debug")) {
             ImGui::Text("Frame time: %.3f ms/frame", 1000.0 / ImGui::GetIO().Framerate);
             ImGui::Text("Framerate: %.1f FPS", ImGui::GetIO().Framerate);
-            ImGui::Text("Center Frequency: %.0 Hz", gui::waterfall.getCenterFrequency());
+            ImGui::Text("Center Frequency: %.0f Hz", gui::waterfall.getCenterFrequency());
             ImGui::Text("Source name: %s", sourceName.c_str());
             if (ImGui::Checkbox("Test technique", &dcbias.val)) {
                 sigpath::signalPath.setDCBiasCorrection(dcbias.val);

core/src/gui/menus/audio.cpp

@@ -79,7 +79,7 @@ namespace audiomenu {
             deviceId = stream->audio->getDeviceId();
 
             ImGui::SetCursorPosX((menuColumnWidth / 2.0f) - (ImGui::CalcTextSize(name.c_str()).x / 2.0f));
-            ImGui::Text(name.c_str());
+            ImGui::Text("%s", name.c_str());
 
             ImGui::PushItemWidth(menuColumnWidth);
             bool running = stream->running;

soapy/src/main.cpp

@@ -271,7 +271,7 @@ private:
 
         int i = 0;
         for (auto gain : _this->gainList) {
-            ImGui::Text((gain + " gain").c_str());
+            ImGui::Text("%s gain", gain.c_str());
             ImGui::SameLine();
             ImGui::SetCursorPosX(gainNameLen);
             ImGui::SetNextItemWidth(menuWidth - gainNameLen);