嵌套函数计算!a+!b+!c

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​
#include<iostream>
using namespace std;
int fun1(int a)
{	int i,s=0;
	for(i=1;i<=a;i++)
	s=s+i;
	return s;


}
int fun2(int a,int b,int c)
{
	return fun1(a)+fun1(b)+fun1(c);


}
void main()
{	int fun1(int a);
	int fun2(int a,int b,int c);
	int a,b,c;
	cout<<"请输入三个数"<<endl;
	cin>>a>>b>>c;
	cout<<"!"<<a<<"+!"<<b<<"+!"<<c<<"="<<fun2(a,b,c)<<endl;
}
​