我试图使用rand()从数组中打印一个随机字符。

Question

你好，我只想编写一个程序，从数组中随机选择一个字符，到目前为止，我已经想出了这段代码。我在最后一个printf()处得到一个错误消息help...Thread 1: EXC_BAD_ACCESS (code=1，address=0x48)

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

int main(){
    int lower = 1, upper = 6;
    int test;
    srand((unsigned int)time(0));

    char*  placeArray[]={"Renti","Mosxato","Tavros","Kallithea","Petralona","Thisio"};
    int i, num;
    for (i=0;i<6;i++){
        num=(rand() % (upper - lower + 1)) + lower;
        test=(int)num;
        printf("%d ",num);
        printf("%s\n",placeArray[num]);

    }
    return 0;
}

Answer 1

num在最后一个printf中应该是num-1，因为数组中的元素范围是0到5，如下所示

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

int main(){
    int lower = 1, upper = 6;
    int test;
    srand((unsigned int)time(0));

    char * placeArray[]= {"Renti", "Mosxato", "Tavros", "Kallithea", "Petralona", "Thisio"};
    int i, num;
    for (i = 0; i < 6; i++){
        num = (rand() % (upper - lower + 1)) + lower;
        test = (int)num;
        printf("%d ", num);
        printf("%s\n", placeArray[num - 1]);
    }
    return 0;
}