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What is function prototype in C language
A function is a self-contained block that carries out a specific well-defined task.
Types of functions
Functions are broadly classified into two types which are as follows −
- Predefined functions
- User defined functions
Communications among functions
Functions communicate among themselves by using arguments and return value.
Farm of ‘C’ function for return-datatype function name (argument list) is as follows −
{
local variable declarations;
executable statements(s);
return (expression);
}For Example, void mul (int x, int y).
{
int p;
p=x*y;
printf(“product = %d”,p);
}Prototype functions
These functions can be done in two ways as explained below −
Create a copy of the function declaration with the arguments typed, with or without identifiers for each.
For example,
int func(int, float, unsigned [2]); int func(int i, float f, unsigned u[2]);
We can also prototype a function by writing the function definition in prototype form.
For example,
int func(int i, float f, unsigned u[2]){
< code for func >
}Use of function prototype
A prototyped function which is called with one or more arguments of incompatible type.
When the explicit or implicit declarations for the same function are encountered. This version of the compiler scrutinizes the duplicate declarations carefully and catches inconsistencies.
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