objective-c随机数

Posted on 2012-03-19 10:16 billpeng 阅读(265) 评论(0) 编辑收藏举报

   // 随机产生散点数据
    NSUInteger i;
    for ( i = 0 ; i < nums ; i++ ) {
        x [i] = i ;
        y1 [i] = ( nums * 10 )*( rand ()/( float ) RAND_MAX );
        y2 [i] = ( nums * 10 )*( rand ()/( float ) RAND_MAX );
    }