#include<iostream> #include<cstdlib>//标准辅助函数库(exit(),rand(),srand()...) #include<ctime> using namespace std; int main() { int i,a,b,n;//a-表示下限,b-表示上限,n是个数; cout<<"On this computer,the RAND_MAX is : "<<RAND_MAX<<". ";//查询本机RAND_MAX的值; cout<<"vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv: "; srand((int)time(0));//由时间得随机种子; cout<<" 请输入范围 [a,b],以及个数n"<<endl; cin>>a; cin>>b; cin>>n; if(a>b) { cout<<"请重新输入"<<endl; exit(1);//exit(x)表示传给程序说明异常退出; } cout<<"输出n个随机数"<<endl; for(i=0;i<n;i++) cout<<(int)(((double)rand()/RAND_MAX)*(b-a)+a)<<endl;//强制double由于rand/RAND_MAX的值非整数,最终结果再强制int; return 0; }