What is an implicit conversion
In C, implicit numeric conversion means that in some cases, the compiler will automatically convert one data type to another without explicit type conversion operations.
Here are some common implicit numeric conversion rules:
When an integer type and a floating-point number type are operated, the integer type is automatically converted to a floating-point number type.
When an expression contains two different types of integer types, small-range integer types are automatically converted to large-range integer types.
When an expression contains two different types of floating point number types, the lower-precision floating point number types are automatically converted to the higher-precision floating point number types.
Here is an example of C code using implicit numeric conversion:
#include <>
int main() {
int a = 5;
float b = 3.14;
double c = a + b; // Integer type a is implicitly converted to floating point type printf("%f\n", c);
int d = 10;
long e = 100;
long f = d + e; // Small-range integer type d implicitly converts to large-range integer type printf("%ld\n", f);
float g = 1.23;
double h = 2.34;
double i = g + h; // Lower precision floating point number type g implicitly converts to higher precision floating point number type printf("%lf\n", i);
return 0;
}How Go language handles digital conversion
Different types of operations are performed, and even if the underlying data types are consistent, it will not be supported.
type Integer int
func main(){
var a int32 = 1
var b Integer = 2
(a + b) // Compile error Invalid operation: a + b (mismatched types int32 and Integer)}The correct way to deal with it should be explicit conversion
type Integer int
func main(){
var a int32 = 1
var b Integer = 2
(a + int32(b)) // Compile and print 333 (Integer(a) + b) // Compile and print 333}Reasons for not supporting
The main designers of Go language have basically been engaged in C/C++ language design or compiler design. They believe that the convenience obtained in implicit data conversion is not enough to eliminate many problems it brings.
- Ease of readability and reliability: Explicit type conversions can make the code more clear and help improve the readability and reliability of the code. For where type conversion is required, explicitly writing the type conversion code can make people understand the intent of the code better.
- Reduce errors: Implicit type conversion can easily cause code errors. For example, when calculating floating-point numbers, if integers are implicitly converted to floating-point numbers, it may lead to accuracy loss or calculation errors. Explicit type conversion can help programmers better control type conversion and reduce the occurrence of such errors.
- Code maintenance: Implicit type conversion will make the code less clear, which will make the code more difficult to maintain. If debugging or modifying the code requires, explicit type conversions can make it easier for programmers to understand the behavior of the code.
- Complicate the compiler; "usual arithmetic conversion" is not easy to implement and is inconsistent in different architectures (Note: My understanding is that providing implicit data type conversion will increase the difficulty of the compiler)
This is the end of this article about the reasons why Go does not provide implicit digital conversion. For more related contents of Go implicit digital conversion, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!