
long random(void)
int rand(void)
void srand(unsigned seed)
random返回的是一个0到(2^31 - 1)的long类型整数
rand返回的是一个0到RAND_MAX的int类型整数
而你这里产生的随机数序列是一样的,这个很好解释,因为你知道srand,但是你却不知道还有一个srandom,这个函数是为random设置种子的,参数和srand一样。
我的帮助手册上甚至是这么写的:
The random() and srandom() functions have (almost) the same calling sequence
and initialization properties as the rand(3) and srand(3) functions. The
difference is that rand(3) produces a much less random sequence -- in fact,
the low dozen bits generated by rand go through a cyclic pattern. All of
the bits generated by random() are usable. For example, `random()&01' will
produce a random binary value.
=============================
希望我的回答能给你带来帮助
#include<stdio.h>#include<stdlib.h>
#include<time.h>
int main()
{
int i,j
srand(time(0))
for( i = 0i <1000i++)
for(j = 0i <100i++){
printf("%3d",rand()%100+1)
printf("\n")
}
return 0
}
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