3.

#include
     
      using namespace std;int main(){    char c1 = 'a', c2 = 'b', c3 = 'c', c4 = '\101', c5 = '\116';    cout << c1 << c2 << c3 << '\n';    cout << "\t\b" << c4 << '\t' << c5 << '\n';    return 0;}
     

 

结果：

4.

#include
     
      using namespace std;int main(){    char c1 = 'C', c2 = '+', c3 = '+';    cout << "I say: \"" << c1 << c2 << c3 << '\"';    cout << "\t\t" << "He says: \"C++ is very interesting!\"" << '\n';    return 0;}
     

 

结果：

 

 5.

(1). -72.5;

(2). 11.5;

(3). 23;

(4). a = b = c = 9;

(5). a = b = 6;

(6). a = 6, b = 5;

(7). 2.5;

(8). 3 or 3.5;

 

6.

a = 12;

a += a; 24

a -= 3; 9

a *=2 + 3; 60

a /=a + a; 0

a %=(n%=2); 0

a += a -= a *= a; 0

 

7.

#include
      
       using namespace std;int main(){    int i, j, m, n;    i = 8;    j = 10;    m = ++i + j++;    n = (++i) + (++j) + m;    cout << i << '\t' << j << '\t' << m << '\t' << n << endl;    return 0;}
      

 

结果：

 

8.

#include
      
       using namespace std;int main(){    char c1 = 'C', c2 = 'h', c3 = 'i', c4 = 'n', c5 = 'a';    int n = 4;    c1 = c1 + n;    c2 = c2 + n;    c3 = c3 + n;    c4 = c4 + n;    c5 = c5 + n;    cout << c1 << c2 << c3 << c4 << c5 << endl;    return 0;}
      

 

结果：