如何生成范围内的随机数（-x，x） [英] How to generate random number within range (-x,x)

问题描述

Hi
可以使用rand（）在一个范围（-x，x）内生成随机数。

Hi It is possible to generate random number within a range (-x,x) using rand()?? If not, how can I generate random number withing that range ?

推荐答案

// return a random number between 0 and limit inclusive.
int rand_lim(int limit) {

    int divisor = RAND_MAX/(limit+1);
    int retval;

    do { 
        retval = rand() / divisor;
    } while (retval > limit);

    return retval;
}

// Return a random number between lower and upper inclusive.
int rand_lim(int lower, int upper) {
    int range = abs(upper-lower);

    return rand_lim(range) + lower;
}

像往常一样，至少产生轻微的扭曲结果。

As usual, all the others I've seen in this thread can/will produce at least slightly skewed results.

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