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第一章  
5:  
#include <iostream> using namespace std; int main() {  
 cout<<"This"<<"is";  cout<<"a"<<"C++";  
 cout<<"program."<<endl;  return 0; } 6:  
#include <iostream> using namespace std; int main() {  
 int a,b,c;  a=10;  b=23;  c=a+b;  
 cout<<"a+b=";  cout<<c;  cout<<endl;  return 0; }  7:  
#include <iostream> using namespace std; int main() {  
 int a,b,c;  
 int f(int x,int y,int z);  cin>>a>>b>>c;  c=f(a,b,c);  
 cout<<c<<endl;  return 0; }   
int f(int x,int y,int z) {  
  int m;  
 
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