如何设置android随机数的上下限

Posted 2023-05-07

这个和java是一样的啊
Random类和math类的random（）方法都是可以的，在参数里面设置个上限，然后加上你的下限 ，int a = min+random（max），因为这个随机数产生的是0到1的数追问

我想让随机数为1~10 是不是int a=1+random(10),就可以了？

追答

1~10 是不是int a=1+random(9)

参考技术A math类的random（）方法产生的随机数是[0,1)看到这里你就明白了把

c++随机抽取名字？

如何做一个软件，能从90人中随机抽10人不重复，且能公布人名

首先需要一个容器来容纳这九十个名字
可以用c++11的array，要记得头文件(vector也行，慢一点)
当然老老实实用数组也行
接着就是随机抽取了
randNum = rand() % (high - low + 1) + low;
randNum是我们要的随机数，rand()是一个空类型函数，需要#include<cstdlib>
high和low自然就是上下限咯，在这里应该是0和89
虽然上面的一小段程序不是完完全全随机的，不过足矣，并且简单
再就是每个randNum不能一样
这个比较不好整，我还没想到好的方法
就暴力呗
每生成一个就与前面的判断
相等就重新生成
抽到是个就输出就是了 参考技术A

由于临时起90个汉字名字有点困难，这里就用“零一”~“玖十”来代替。算法还是要有一点技巧的，不然可能会很慢。所以若帮助了你，请采纳(采纳时可不要点错了哟)。

代码文本：

//#include "stdafx.h"//vc++ 6.0? Maybe should add this line.

#include <stdlib.h>

#include <string>

#include <iostream>

#include "time.h"

using namespace std;

int main(int argc,char *argv[])

string ple[90]="零一","零二","零三","零四","零五","零六","零七","零八","零九","壹十",

"壹一","壹二","壹三","壹四","壹五","壹六","壹七","壹八","壹九","贰十",

"贰一","贰二","贰三","贰四","贰五","贰六","贰七","贰八","贰九","叁十",

"叁一","叁二","叁三","叁四","叁五","叁六","叁七","叁八","叁九","肆十",

"肆一","肆二","肆三","肆四","肆五","肆六","肆七","肆八","肆九","伍十",

"伍一","伍二","伍三","伍四","伍五","伍六","伍七","伍八","伍九","陆十",

"陆一","陆二","陆三","陆四","陆五","陆六","陆七","陆八","陆九","柒十",

"柒一","柒二","柒三","柒四","柒五","柒六","柒七","柒八","柒九","捌十",

"捌一","捌二","捌三","捌四","捌五","捌六","捌七","捌八","捌九","玖十";

int f[90],i,k,t;

for(i=0;i<90;f[i]=i++);

cout << "本次选出的十个人分别是:\\n";

srand((unsigned)time(NULL));

for(i=0;i<10;i++)

cout << ple[f[k=rand()%(90-i)]] << (i<9 ? ' ' : '\\n');

t=f[k],f[k]=f[89-i],f[89-i]=t;

return 0;