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I dentifiers are names given to different entities such as constants, variables, structures, functions, etc. Example: int amount ; double totalbalance; In the above example, amount and totalbalance are identifiers and int, and double are keyword Meaning of Identifier -   A lable attached for the purpose of identification  Second Defination_- Identifier refer to the names of variables , function, arrays , classes , etc . created by the programmer .

 //Take Nothing Return Nothing #include<stdio.h> void sum() {     add(); } void sum(void);// Function Declaration void main() {     sum();// Function Call } void add()// Function Defination {     int a,b;     printf("Enter Two Number");     scanf("%d%d",&a,&b);     printf("Sum is %d",a+b); }