求助为什么这个编程不能运行？

#include<iostream.h>

int main()
{
    using namespace std

    int carrots;   //declare an integer variable

    carrots=25;    //assing a value to the variable
    cout<<"I have";
    cout<<carrots;  //display the value of the variable
    cout<<"carrots.";
    cout<<endl;
    carrots=carrots-1; //modify the   
    cout<<"Crunch,crunch.Now I have"<<carrots<<"carrots."<<endl;
    getch();
    return 0;
}