IOS随机产生字符串，数字

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产生随机数的几个函数：rand()、srand()、random()、arc4random()

1、使用26个英文字母随机产生10位的字符串

int NUMBER_OF_CHARS =10;

char data[NUMBER_OF_CHARS];

for (intx=0;xchar)('A' +(arc4random_uniform(26))));

NSString *dataPoint =[[NSString alloc]initWithBytes:data length:NUMBER_OF_CHARSencoding:NSUTF8StringEncoding];

2、产生随机数字

（1）、获取一个随机整数范围在：[0,100)包括0，不包括100

int x =arc4random() % 100;

（2）、获取一个随机数范围在：[500,1000），包括500，不包括1000

int y =(arc4random() % 501) + 500;

（3）、获取一个随机整数，范围在[from,to），包括from，不包括to

-(int)getRandomNumber:(int)from to:(int)to

{

return (int)(from + (arc4random() % (to – from +1)));

}

（4）、Getrandom value between 0 and 99

<span style="color:#a61390;margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">             int</span> x <span style="color:#0220;margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">=</span> arc4random<span style="color:#0220;margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">(</span><span style="color:#0220;margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">)</span> <span style="color:#0220;margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">%</span> <span style="color:#240d9;margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">100</span>; <wbr><em>      Get random number between 500 and 1000</em></wbr>

<span style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; line-height: 15px;"><span style="font-family:monospace;color:#110000;">      </span></span><span style="color:#a61390;line-height: 1.333; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">int</span><span style="color:#110000;"><span style="line-height: 1.333;"> y </span></span><span style="color:#0220;line-height: 1.333; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">=</span><span style="color:#110000;"><span style="line-height: 1.333;">  </span></span><span style="color:#0220;line-height: 1.333; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">(</span><span style="color:#110000;"><span style="line-height: 1.333;">arc4random</span></span><span style="color:#0220;line-height: 1.333; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">(</span><span style="color:#0220;line-height: 1.333; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">)</span><span style="color:#110000;"><span style="line-height: 1.333;"> </span></span><span style="color:#0220;line-height: 1.333; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">%</span><span style="color:#110000;"><span style="line-height: 1.333;"> </span></span><span style="color:#240d9;line-height: 1.333; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">501</span><span style="color:#0220;line-height: 1.333; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">)</span><span style="color:#110000;"><span style="line-height: 1.333;"> </span></span><span style="color:#0220;line-height: 1.333; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">+</span><span style="color:#110000;"><span style="line-height: 1.333;"> </span></span><span style="color:#240d9;line-height: 1.333; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">500</span><span style="color:#0220;line-height: 1.333; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px;">)</span><span style="color:#110000;"><span style="line-height: 1.333;">;</span></span>

（5）、随机产生浮点数

      如果是一位小数：<span style="line-height: 1.333;">(float)(rand() + 10)/10.0f</span>

      如果是两位小数：<span style="line-height: 1.333;">(float)(rand() + 10)/100.0f</span>

<span style="font-size:12px;color:#1100;white-space: pre; line-height: 1.333;">           </span><span style="color:#110000;"><span style="font-size:12px;line-height: 15px; white-space: pre;">rand() 是算出0-9的数,+10后就是 10_19的数,除10后就是1.0-1.9之间的数了</span></span>

<span style="font-family:monospace;"><span style="line-height: 15px;"></span></span><img src="http://img.blog.csdn.net/20160128163511367?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

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