Demo: Use correct string formats on non-windows platforms.

(amended)

imgui_demo.cpp

@@ -135,6 +135,16 @@ Index of this file:
 #define vsnprintf   _vsnprintf
 #endif
 
+// Format specifiers, printing 64-bit hasn't been decently standardized...
+// In a real application you should be using PRId64 and PRIu64 from <inttypes.h> (non-windows) and on Windows define them yourself.
+#ifdef _MSC_VER
+#define IM_PRId64   "I64d"
+#define IM_PRIu64   "I64u"
+#else
+#define IM_PRId64   "lld"
+#define IM_PRIu64   "llu"
+#endif
+
 // Helpers macros
 // We normally try to not use many helpers in imgui_demo.cpp in order to make code easier to copy and paste,
 // but making an exception here as those are largely simplifying code...
@@ -1918,12 +1928,12 @@ static void ShowDemoWindowWidgets()
         ImGui::SliderScalar("slider u32 low",       ImGuiDataType_U32,    &u32_v, &u32_zero, &u32_fifty,"%u");
         ImGui::SliderScalar("slider u32 high",      ImGuiDataType_U32,    &u32_v, &u32_hi_a, &u32_hi_b, "%u");
         ImGui::SliderScalar("slider u32 full",      ImGuiDataType_U32,    &u32_v, &u32_min,  &u32_max,  "%u");
-        ImGui::SliderScalar("slider s64 low",       ImGuiDataType_S64,    &s64_v, &s64_zero, &s64_fifty,"%I64d");
-        ImGui::SliderScalar("slider s64 high",      ImGuiDataType_S64,    &s64_v, &s64_hi_a, &s64_hi_b, "%I64d");
-        ImGui::SliderScalar("slider s64 full",      ImGuiDataType_S64,    &s64_v, &s64_min,  &s64_max,  "%I64d");
-        ImGui::SliderScalar("slider u64 low",       ImGuiDataType_U64,    &u64_v, &u64_zero, &u64_fifty,"%I64u ms");
-        ImGui::SliderScalar("slider u64 high",      ImGuiDataType_U64,    &u64_v, &u64_hi_a, &u64_hi_b, "%I64u ms");
-        ImGui::SliderScalar("slider u64 full",      ImGuiDataType_U64,    &u64_v, &u64_min,  &u64_max,  "%I64u ms");
+        ImGui::SliderScalar("slider s64 low",       ImGuiDataType_S64,    &s64_v, &s64_zero, &s64_fifty,"%" IM_PRId64);
+        ImGui::SliderScalar("slider s64 high",      ImGuiDataType_S64,    &s64_v, &s64_hi_a, &s64_hi_b, "%" IM_PRId64);
+        ImGui::SliderScalar("slider s64 full",      ImGuiDataType_S64,    &s64_v, &s64_min,  &s64_max,  "%" IM_PRId64);
+        ImGui::SliderScalar("slider u64 low",       ImGuiDataType_U64,    &u64_v, &u64_zero, &u64_fifty,"%" IM_PRIu64 " ms");
+        ImGui::SliderScalar("slider u64 high",      ImGuiDataType_U64,    &u64_v, &u64_hi_a, &u64_hi_b, "%" IM_PRIu64 " ms");
+        ImGui::SliderScalar("slider u64 full",      ImGuiDataType_U64,    &u64_v, &u64_min,  &u64_max,  "%" IM_PRIu64 " ms");
         ImGui::SliderScalar("slider float low",     ImGuiDataType_Float,  &f32_v, &f32_zero, &f32_one);
         ImGui::SliderScalar("slider float low log", ImGuiDataType_Float,  &f32_v, &f32_zero, &f32_one,  "%.10f", ImGuiSliderFlags_Logarithmic);
         ImGui::SliderScalar("slider float high",    ImGuiDataType_Float,  &f32_v, &f32_lo_a, &f32_hi_a, "%e");
@@ -1932,12 +1942,12 @@ static void ShowDemoWindowWidgets()
         ImGui::SliderScalar("slider double high",   ImGuiDataType_Double, &f64_v, &f64_lo_a, &f64_hi_a, "%e grams");
 
         ImGui::Text("Sliders (reverse)");
-        ImGui::SliderScalar("slider s8 reverse",    ImGuiDataType_S8,   &s8_v,  &s8_max,    &s8_min, "%d");
-        ImGui::SliderScalar("slider u8 reverse",    ImGuiDataType_U8,   &u8_v,  &u8_max,    &u8_min, "%u");
+        ImGui::SliderScalar("slider s8 reverse",    ImGuiDataType_S8,   &s8_v,  &s8_max,    &s8_min,   "%d");
+        ImGui::SliderScalar("slider u8 reverse",    ImGuiDataType_U8,   &u8_v,  &u8_max,    &u8_min,   "%u");
         ImGui::SliderScalar("slider s32 reverse",   ImGuiDataType_S32,  &s32_v, &s32_fifty, &s32_zero, "%d");
         ImGui::SliderScalar("slider u32 reverse",   ImGuiDataType_U32,  &u32_v, &u32_fifty, &u32_zero, "%u");
-        ImGui::SliderScalar("slider s64 reverse",   ImGuiDataType_S64,  &s64_v, &s64_fifty, &s64_zero, "%I64d");
-        ImGui::SliderScalar("slider u64 reverse",   ImGuiDataType_U64,  &u64_v, &u64_fifty, &u64_zero, "%I64u ms");
+        ImGui::SliderScalar("slider s64 reverse",   ImGuiDataType_S64,  &s64_v, &s64_fifty, &s64_zero, "%" IM_PRId64);
+        ImGui::SliderScalar("slider u64 reverse",   ImGuiDataType_U64,  &u64_v, &u64_fifty, &u64_zero, "%" IM_PRIu64 " ms");
 
         static bool inputs_step = true;
         ImGui::Text("Inputs");