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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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The declaration int f() means a function returning int that takes any number of parameters.(takes an unknown number of parameters of unknown types, giving it the wrong number results in undefined behavior. )
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#include<stdio.h>
int cubeByValue(int n);
int main(){
    int number = 5 ;
    printf("The original value of number is %d\n",number);
    number = cubeByValue(number);   
    printf("The new  ......
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