偶数=质数和.cpp

Visual C++的课件和一些习题及答案

#include <iostream.h>
#include <iomanip.h>
#include <math.h>
int f(int i)
{
int j,k;
for (j=2;j<=sqrt(i);j++){
    k=1;
	if (i%j)
	continue;
	k=0;
	return (k);}
}
void main()
{
	int x,i;
        cin>>x;
	for(i=2;i<=(x-2);i+=1)
	if (f(i)&&f(x-i))
		cout<<"x="<<i<<'+'<<x-i<<endl;
}