常用碎程序 随机数 时间

#include <iostream>#include <ctime>#include <cstdlib>//产生随机数字#include <math.h> //for powusing namespace std;//产生了随机数double random(double start, double end){ return start+(end-start)*rand()/(RAND_MAX + 1.0); //#include <ctime> //#include <cstdlib>//产生随机数字}int main(){ srand(unsigned(time(0))); for(int icnt = 0; icnt != 10; ++icnt) cout << "No." << icnt+1 << ": " << int(random(1,10000))<< endl;return 0;

 

 

//获取时间#include <time.h>string getTime(){time_t t = time(0);char tmp[64];strftime( tmp, sizeof(tmp), "%Y-%m-%d_%X",localtime(&t));string date = tmp;return date;