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using std::srand
这句把分号加上

rand_max改为RAND_MAX
C++是区分大小写的

cout << "three random integer from 0 to " << rand_max <<": "
     << rend() << " " <这句输出句子中，有一个rand写成了read了。

下面是我改了的：

//program 2.5 using random integers
#include
#include
#include
using std::cout;
using std::endl;
using std::rand;
using std::srand;
using std::ctime;

int main() {
    const int limit1 = 500; //upper limit for on set of random values
    const int limit2 = 31; //upper limlt for another set of values

    cout << "first we will use the default sequence form rand(). \n ";
    cout << "three random integer from 0 to " << RAND_MAX << ": "
         << rand() << " " << rand() << " " << rand() << endl;

    cout << endl << "now we will use a new seed for rand ().\n";
    rand((unsigned int)time(0));

    cout << "three random integer from 0 to " << RAND_MAX <<": "
         << rand() << " " <    return 0;
}

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