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以下程序实现交换a,b变量的值，程序第(1)步出错（填写数字1或2），应改为(2)（填写正确的语句）#include using namespace std;void mySwap(int& a, int& b) //第1步{ a=a+b;b=a-b;a=a-b;}int main(){ int a=19,b=15;cout<<"a="<

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若以下代码的输入为20和30，写出其"运行”结果（Input:20 30不算运行结果）。#include using namespace std;void input(int p,int q);void add(int p,int q);void process(int p,int q,void (fun)(int ,int ));int main(){ int a,b;process(&a,&b,input);process(&a,&b,add);return 0;}void input(int p,int q){ cout<<"Input:";cin>>p>>q;}void add(int p,int q){ cout<<"Output:"<<(p+*q)<

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