答案:#include <iostream>using namespace std;int main(){ int t,a,b,c,d; cout<<"enter four numbers:"; cin>>a>>b>>c>>d; cout<<"a="<<a<<", b="<<b<<", c="<<c<<",d="<<d<<endl; if (a>b) { t=a; a=b; b=t; } if (a>c) { t=a; a=c; c=t; } if (a>d) { t=a; a=d; d=t; } if (b>c) { t=b; b=c; c=t; } if (b>d) { t=b; b=d; d=t; } if (c>d) { t=c; c=d; d=t; } cout<<"the sorted sequence:"<<endl; cout<<a<<", "<<b<<", "<<c<<", "<<d<<endl; return 0;}