What is the difference in using a function in c and C++. C++ asks for a prototype declaration while in C no such Question is asked by the compiler

Both in c and c++ prototype declaration for functions is required but it is not mandatory....

1. if u define your function before main() then no need to define prototype cos function definition provides the prototype.

ex:
#include<iostream.h>

void display()
{
cout<<"hi c++"<<endl;
return ;
}

int main()
{
void display();
display();
return 0;
}

2.if u define your function after main(), then you can declare the prototype at the point where you call the function or before main()

ex:
#include<iostream.h>

int main()
{
void display(); //function prototype before calling the function
display();
return 0;
}

void display()
{
cout<<"hi C++"<<endl;
return ;
}


or

#include<stdio.h>


void display(); //function prototype before main()

int main()
{

display();
return 0;
}

void display()
{
cout<<"hi C++"<<endl;
return ;
}

we have to explicitely type cast the C functions however the C++ compiler can inplicitely typecast the C++ functions.