Question

C编写程序,用来生成一个随机小写字符串(长度为20)

Answer 1

#include<ctime> //可用于生成随机数的头文件
#include<stdio.h>
int main()
{
srand(0);//生成随机数的种子
char s[20+1]; //定义长度为21的数组，最后一个字符用于存放字符串结束符
for(int i = 0;i<20;i++)
{
s[i] = (char)(rand()%26+97);//生成随机小写字母
}
s[20] = '\0';//字符串结束的标志
printf("%s",s); //输出字符串
return 0;
}

Answer 2

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main() {
int i;
char s[21];
srand((char)time(NULL));
for(i = 0; i < 20; ++i) s[i] = (char)(rand()%27 + 'a');
s[20] = '\0';
printf("s = %s\n",s);
return 0;
}

Answer 3

#include<stdio.h>
#include<time.h>
int main(void)
{
srand(time(0));
int i,n;
for(i=0;i<20;i++)
{
n=rand()%26+97;
printf("%c ",n);
}
system("pause");
return 0;
}
20个。ok？

Answer 4

#include<stdio.h>
#include<time.h>
#include<stdlib.h>
#define MAX 20
void main()
{
char s[MAX+1];
int i=0;
srand((unsigned)(time(0)));
for(i=0;i<MAX;i++)
{
s[i]=rand()%26+'a';
}
s[i]='\0';
printf("%s\n",s);
}