main.cpp

C++课程更学习...对于初学者很有好出

#include <stdio.h>

int sum(int a, int b); // declaration
int sum(int a, int b, int c=400);
/*
long Sum (long a, long b) 
{  
	return (a+b); 
}

int Sum (int a, int b) 
{  
	return (a+b); 
}

double Sum (double a, double b) 
{ 
	return (a+b);
}
*/
int main()
{
	long nA = 5;
	int nR = sum(3, 5, nA);
	return 0;
}

int sum(int a, int b) // definition
{
	return (a + b);
}

int sum(int a, int b, int c)
{
	return (a + b + c);
}