Using limits.h LLONG_MIN etc. to increase old-compiler compatibility (as ll and ull prefixes were not standard). Not tested much on old compilers, relying on Clang/GCC warnings.
diff --git a/imgui.cpp b/imgui.cpp
index 0ae620e..69c00ce 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -848,14 +848,14 @@
#endif
#endif
-static const ImS32 IM_S32_MIN = 0x80000000; // INT_MIN;
-static const ImS32 IM_S32_MAX = 0x7FFFFFFF; // INT_MAX;
+static const ImS32 IM_S32_MIN = INT_MIN; // (-2147483647 - 1), (0x80000000);
+static const ImS32 IM_S32_MAX = INT_MAX; // (2147483647), (0x7FFFFFFF)
static const ImU32 IM_U32_MIN = 0;
-static const ImU32 IM_U32_MAX = 0xFFFFFFFF;
-static const ImS64 IM_S64_MIN = -9223372036854775807ll - 1ll;
-static const ImS64 IM_S64_MAX = 9223372036854775807ll;
+static const ImU32 IM_U32_MAX = UINT_MAX; // (0xFFFFFFFF)
+static const ImS64 IM_S64_MIN = LLONG_MIN; // (-9223372036854775807ll - 1ll);
+static const ImS64 IM_S64_MAX = LLONG_MAX; // (9223372036854775807ll);
static const ImU64 IM_U64_MIN = 0;
-static const ImU64 IM_U64_MAX = 0xFFFFFFFFFFFFFFFFull;
+static const ImU64 IM_U64_MAX = ULLONG_MAX; // (0xFFFFFFFFFFFFFFFFull);
// When using CTRL+TAB (or Gamepad Square+L/R) we delay the visual a little in order to reduce visual noise doing a fast switch.
static const float NAV_WINDOWING_HIGHLIGHT_DELAY = 0.20f; // Time before the highlight and screen dimming starts fading in
