The differences are as follows:
1. The int data type is 32 bits and the double data type is 64 bits;
2. The default of the int data type The value is 0, and the default value of double data type is 0.0d;
3. The default type of integer variable is int type, and the default type of floating point number is double type.
int type
int data type is a 32-bit, signed integer expressed in two's complement;
The minimum value is -2,147,483,648 ( -2^31);
The maximum value is 2,147,483,647 (2^31 - 1);
Generally, integer variables default to int type;
The default value is 0 ;
Example: int a = 100000, int b = -200000.
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double type
double data type is double precision, 64-bit, Floating point numbers that comply with the IEEE 754 standard;
The default type of floating point numbers is the double type;
The double type also cannot represent precise values, such as currency;
The default value is 0.0d;
Example: double d1 = 123.4.
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