C++产生随机数示例

#include <iostream>
#include <cstdlib>
#include <ctime>
using std::cout;
using std::endl;
int main(void){
	
	//使用默认种子值产生随机数，每次产生的都一样
	cout << rand() << " " << rand() << " " << rand() << endl;
	
	//使用新种子产生随机数，每次都不一样
	srand((unsigned int)time(0));
	cout << rand() << " " << rand() << " " << rand() << endl;
	return 0;
}

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