Fundamental data types
Variable:
A variable is a named storage location whose value can change.
Basic/Fundamental data types in “C++” language
int
float
double
char
int
A variable of type int can store a numeric value without decimal (without fractions).
Size : 2 byte
Range : -32768 to 32767
Example :
int a,b,c;
int roll;
float
A variable of type float can store a numeric value with decimal.
Size: 4 byte
Range : 3.4e-38 to 3.4e+38
: 3.4*10-38 to 3.4*10+38
Example:
float x,y,z;
float per;
double
A variable of type double can store a numeric value with decimal.
Size: 8 byte
Range: 1.7e-308 to 1.7e+308
Example:
double a1,a2;
The range of double is much larger as compared to float.
Char
A variable of type char can store alphanumeric value.
Size: 1 byte
Range: -128 to 127
0 to 255
can be used in two ways
(i).
char n;
can store only a single character
(ii). char n[20];
(20: represents the size, can be anything as per requirement)
can store a group of characters
This is known as a character array or string.
void:
(void empty set and non-returning functions):
void data type specifies an empty set of values. It is used as the return type for functions that do not return a value. No object of type void may be declared.
