02_利用rand7() 产 生 rand10() 1~10(均匀概率)

#include <iostream>#include <cmath>using namespace std;int rand7(){int n = 25;while(n > 21){n = 5*(rand5()-1) + rand5();}return n%7 + 1;}int rand10(){int n = 49;while(n > 40){n = (rand7() -1) * 7 + rand7();}return n%10 + 1;}