snapshot before regression test

Test/FormatStringTest/App/main.py

@@ -0,0 +1,52 @@
+from stdint import *
+import t, c
+import ctraits
+import stdio
+import testcheck
+
+
+# ============================================================
+# FormatStringTest - 格式化字符串回归测试
+# ============================================================
+@t.CExport
+def main() -> int:
+    testcheck.begin("FormatStringTest: Format String Regression")
+
+    b: str = "hello world"
+    for i in b:
+        stdio.printf("%c\n", i)
+        b += 1
+    print(b-11)
+
+    l: t.CArray[u64] = [0, 43, 2, 3, 4]
+    l[0] = 1000
+    for i in l:
+        stdio.printf("%llu\n", i)
+
+    print("Value: ", f"0x{ULONGLONG(0x11)}")
+    print("ULL Hex: ", f"0x{ULONGLONG(0x11):016X}")
+    print("LL Hex: ", f"{LONGLONG(0x11):016X}")
+    print("ULL Dec: ", f"{ULONGLONG(42):d}")
+    print("LL Dec: ", f"{LONGLONG(42):d}")
+    print("Hex: ", f"{0x11:016X}")
+    print("Dec: ", f"{42:d}")
+    print("Float: ", f"{3.14159:.2f}")
+
+    # f-string 赋值测试（验证不再直接 printf，而是生成字符串）
+    s: str = f"Value=0x{ULONGLONG(42)}, Hex=0x{ULONGLONG(0x11):016X}"
+    print("Assigned: ", s)
+
+    # ctraits.isptr 编译时类型判断测试
+    ptr_var: INTPTR = c.Addr(s)
+    val_var: int = 42
+    if c.CIf(ctraits.isptr(ptr_var)):
+        print("ptr_var is pointer")
+    if c.CIf(not ctraits.isptr(val_var)):
+        print("val_var is not pointer")
+
+    testcheck.section("placeholder")
+    testcheck.ok("testcheck framework ready")
+    testcheck.info("placeholder test")
+
+    return testcheck.end()
+