第4周项目4-程序分析(1)

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(1)
#include<iostream>using namespace std;void fun(int k){    if(k>0)        fun(k-1);    cout<<k;}int main(){    int w=5;    fun(w);    cout<<endl;    return 0;}
(2)
#include <iostream>using namespace std;void recur(char);int main(){    recur('0');}void recur(char c){    cout<<c;    if(c<'5')        recur(c+1);    cout<<c;}
(3)
#include<iostream>using namespace std;int fun2(int a,int b){    int c;    c=a*b%3;    return c;}int fun1(int &a,int &b){    int c;    a+=a;    b+=b;    c=fun2(a,b);    return c*c;}int main(){    int x=11,y=19;    cout<<fun1(x,y)<<endl;    return 0;}

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