Fix: Complex value initialization error

CHANGELOG.md

@@ -56,6 +56,7 @@ Types of changes:
 ### Removed
 
 ### Fixed
+- Fixed Complex value initialization error. ([#253](https://github.com/qBraid/pyqasm/pull/253))
 
 ### Dependencies
 - Bumps `@actions/checkout` from 4 to 5 ([#250](https://github.com/qBraid/pyqasm/pull/250))

src/pyqasm/maps/expressions.py

@@ -108,9 +108,9 @@ def qasm_variable_type_cast(openqasm_type, var_name, base_size, rhs_value):
 
     if type_of_rhs not in VARIABLE_TYPE_CAST_MAP[openqasm_type]:
         raise ValidationError(
-            f"Cannot cast {type_of_rhs} to {openqasm_type}. "
-            f"Invalid assignment of type {type_of_rhs} to variable {var_name} "
-            f"of type {openqasm_type}"
+            f"Cannot cast '{type_of_rhs.__name__}' to '{openqasm_type.__name__}'. "
+            f"Invalid assignment of type '{type_of_rhs.__name__}' to variable '{var_name}' "
+            f"of type '{openqasm_type.__name__}'"
         )
 
     if openqasm_type == BoolType:
@@ -130,6 +130,8 @@ def qasm_variable_type_cast(openqasm_type, var_name, base_size, rhs_value):
             return ((2 * CONSTANTS_MAP["pi"]) * (1 / 2)) if rhs_value else 0.0
         return rhs_value  # not sure
     if openqasm_type == ComplexType:
+        if isinstance(rhs_value, float):
+            return complex(rhs_value)
         return rhs_value
 
 
@@ -166,7 +168,7 @@ def qasm_variable_type_cast(openqasm_type, var_name, base_size, rhs_value):
     UintType: (bool, int, float, np.int64, np.uint64, np.float64, np.bool_),
     FloatType: (bool, int, float, np.int64, np.float64, np.bool_),
     AngleType: (float, np.float64, bool, np.bool_),
-    ComplexType: (complex, np.complex128),
+    ComplexType: (complex, np.complex128, float, np.float64),
 }
 
 ARRAY_TYPE_MAP = {

tests/qasm3/declarations/test_classical.py

@@ -752,6 +752,14 @@ def test_complex_type_variables():
     complex[float[64]] g = a ** b; 
     complex[float] h = a + b;
     complex i = sqrt(1.0 + 2.0im);
+    complex j = 1.0;
+    complex k;
+    k = 1.0;
+    const complex l = 20.0;
+    float m = 1.0;
+    complex n = m;
+    complex o = l * (2 - 1im);
+    complex p = o + (1.0 + 1.0im);
     """
 
     loads(qasm3_string).validate()

tests/qasm3/resources/variables.py

@@ -447,8 +447,8 @@
         const float[64] f1 = 2.5;
         const bit[2] b1 = bit[2](f1);
         """,
-        "Cannot cast <class 'float'> to <class 'openqasm3.ast.BitType'>. Invalid assignment "
-        "of type <class 'float'> to variable f1 of type <class 'openqasm3.ast.BitType'>",
+        "Cannot cast 'float' to 'BitType'. Invalid assignment of type "
+        "'float' to variable 'f1' of type 'BitType'",
         5,
         8,
         "const bit[2] b1 = bit[2](f1);",