找出以下程序中的语法错误，并作出解释。

1.    1 #include <stdlib.h>
      2 int main() {
      3     const int size;
      4     size = 10;
      5     int a[size];
      6     int *p1 = new int[size];
      7     int *p2 = malloc(sizeof(int)* size);
      8     int *p3 = new int(size);
      9     for(int i = 0; i < size; i++) {
     10         a[i] = i;
     11         p1[i] = a[i] * i;
     12         p2[i] = p1[i] * i;
     13         p3[i] = p2[i] * i;
     14     }
     15     int sum;
     16     for(int i = 0; i < size; i++)
     17         sum += a[i] + p1[i] + p2[i] + p3[i];
     18     cout << sum;
     19     delete p1;
     20     delete [] p2;
     21     delete p3;
     22 }
   

2.    1 #include <iostream>
      2 using namespace std;
      3 class N {
      4     static int n = 0;
      5     int i;
      6 public:
      7     void N() : i(0) { }
      8     void N(int a = 0) : i (a) { }
      9     void N(int a = 0, int b) : i(a), n(b) { }
     10     int get() const { return i++; }
     11     void set(int a) { i = a;}
     12     void print() const { cout << get() << endl;}
     13     static int getn() const { return n; }
     14     static void setn(int a) { n = a; i++; }  
     15 }
     16 int main() {
     17     cout << N::n << endl;
     18     cout << N::getn() << endl;
     19     cout << get() << endl;
     20     cout << N::get() << endl;
     21     cout << N::setn(10) << endl;
     22     N *p = new N(5);
     23     N n();
     24     n.set(10);
     25     n.setn(11);
     26     p.set(5);
     27     delete p;
     28 }
   

读程序，写出程序运行的结果

1.    1 #include <iostream>
      2 using namespace std;
      3 int inc( int &a) {
      4     return ++a;
      5 }
      6 int dec( int a) {
      7     return --a;
      8 }
      9 int main() {
     10     int b = 10;
     11     cout << inc(b) << endl;
     12     cout << dec(b) << endl;
     13     cout << inc(b) << endl;
     14 }
   

程序填空题

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