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//demo.c
#include <stdio.h>

int foo();

int main()
{
int a;
foo(a);
return 0;
}

int foo(int a)
{
}//demo.cpp
#include <iostream>

int foo();

int main()
{
int a;
foo(a);
return 0;
}

int foo(int a)
{
}
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In C, the declaration int f(void) means a function returning int that takes no parameters.
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