Explain with example octal,hexadecimal,integer and real number

 Integer constant :

Integer constant is nothing but a whole number 

Integer constants are positive unless they are preceded by a minus sign (-).

3] An " integer constant " is decimal number. We can provide decimal value to the variable directly as follows:

Declaration int variable=value                                      (decimal);

Example      int A = 127 , B = -100;

Octal Number :

1] The number with base 8, is called octal number.

2 ] we can provide octal value to this variable by prefixing " 0 " to it as follow:

Declaration   int variable = 0 value 

Example        int A = 0127, B = -0100;

Hexadecimal number:

1] The number with base 16,is calledhexadecimal number. 

2] we can provide  hexadecimal value to the variable by prefixing "0x (zero and x) to it as follow:

Declaration  int variable= 0x value ;

 Example       int A=0x224, B= -88.93;

Real Number:

1] Real constant are often called floating point constant. It must have decimal point.

2] Real constant are possitive unless they are proceded by a minus sign(-).

3] The real constant could be written in to two forms, fractional and exponential from.

4] Ex: 88.055 , - 93.07 , 93.700 etc.

Declaration  float variable = real_no;

Example       float A= 88.05, B= 93.70;