In String type we have several method valueOf static String valueOf(boolean b) static String valueOf(char c) static String valueOf(char[] data) static String valueOf(char[] data, int offset, int count) static String valueOf(double d) static String valueOf(float f) static String valueOf(int i) static String valueOf(long l) static String valueOf(Object obj) As we can see those method are … Read more
C++11 introduces std::stoi (and variants for each numeric type) and std::to_string, the counterparts of the C atoi and itoa but expressed in term of std::string. #include <string> std::string s = std::to_string(42); is therefore the shortest way I can think of. You can even omit naming the type, using the auto keyword: auto s = std::to_string(42); … Read more
new Integer(123) will create a new Object instance for each call. According to the javadoc, Integer.valueOf(123) has the difference it caches Objects… so you may (or may not) end up with the same Object if you call it more than once. For instance, the following code: public static void main(String[] args) { Integer a = … Read more
It’s safe provided the int is zero or positive. If it’s negative, and size_t is of equal or higher rank than int, then the int will be converted to size_t and so its negative value will instead become a positive value. This new positive value is then compared to the size_t value, which may (in … Read more
The easiest way is to use Integer.toHexString(int)
The language guarantees that int is at least 16 bits, long is at least 32 bits, and long can represent at least all the values that int can represent. If you assign a long value to an int object, it will be implicitly converted. There’s no need for an explicit cast; it would merely specify … Read more
What you are looking for is ‘type casting’. typecasting (putting the type you know you want in brackets) tells the compiler you know what you are doing and are cool with it. The old way that is inherited from C is as follows. float var_a = 9.99; int var_b = (int)var_a; If you had only … Read more
“What are the differences between Integer and Int?” Integer is just an alias for java.lang.Integer. Int is the Scala integer with the extra capabilities. Looking in Predef.scala you can see this the alias: /** @deprecated use <code>java.lang.Integer</code> instead */ @deprecated type Integer = java.lang.Integer However, there is an implicit conversion from Int to java.lang.Integer if … Read more
It’s actually quite common to store a number without needing to know the exact size of the type. There are plenty of quantities in my programs that I can reasonably assume won’t exceed 2 billion, or enforce that they don’t. But that doesn’t mean I need an exact 32 bit type to store them, any … Read more