C++ Variables declaration & assignments

C++

AN EXAMPLE

#include
int main()
{
int i=0;
double x=2.3;
char s[]= »Hello »;
cout<<i<<endl;
cout<<x<<endl;
cout<<s<<endl;
return 0;
}
1.cpp

LEXICAL ELEMENTS

Identifiers: case sensitive
nCount, strName, Strname
Reservered words
if, else, while
Operators
+, ==, &, &&, ‘? :’
Preprocessor Directives
#include, #if,

Primitive Data Types

Name	Size (bytes)	Description	Range
char	1	character or eight bit integer	signed: -128..127 unsigned: 0..255
short	2	sixteen bit integer	signed: -32768..32767 unsigned: 0..65535
long	4	thirty-two bit integer	signed: -231 .. 231-1 unsigned: 0 .. 232
int	* (4)	system dependent, likely four bytes or thirty-two bits	signed: -32768..32767 unsigned: 0..65535
float	4	floating point number	3.4e +/- 38 (7 digits)
double	8	double precision floating point	1.7e +/- 308 (15 digits)
long double	10	long double precision floating point	1.2e +/- 4932 (19 digits)
bool	1	boolean value false → 0, true → 1	{0,1}

Variables declaration & assignments

#include
using namespace std;
int main()
{
int i,j,k;
int l;
i=10;
j=k=l=20; //j=(k=(i=20))
cout<<« i= »<<i<<endl;
cout<<« k= »<<k<<endl;
cout<<« l= »<<l<<endl;
i+=10; //i = i + 10;
i++; //i = i + 1;
cout << « i= »<<i<<endl;
} 2.cpp