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Types

Primitive types

• int
• long
• double
• string
• mutex

Null values

There are no null values in Concert. The following table defines default values.

Type	Default value
int	undefined 32-bit
long	undefined 64-bit
double	undefined 64-bit
string	Empty string “”
mutex	Not applicable

Properties

Type	Width in bits
int	at least 32
long	at least 64
double	at least 64

Implicit casts

The following may be implicitly cast without a library call. Note that overflows may occur.

From type	To type
int	long
long	int

Declaration

int declaration examples:

int x;
int y = 0;
int z = 5 + y;

long declaration examples:

long l;
long m = 0;
long n = 5 + m;

double declaration examples:

double d;
double pi = 3.14;
double tenth = 1.0 / 10.0;

string declaration examples:

string s;
string partialWelcome = "Hello";
string fullWelcome = partialWelcome + ", world!";

mutex declaration examples:

mutex m;
mutex lock;