我在创建乘法表程序时遇到了分段错误

Question

#include<stdio.h>

main()
{
    int x,y,z;
    z=x*y;

    10<x<20,y<10;

    x=rand()%20;
    y=rand()%10;
    printf("%2d",x);
    printf("%2d",y);
    printf("enter value of z");
    scanf("%d",z);

    if(z=x*y)
    {
       printf("correct");
    }
    else
      printf("wrong no. entered");
}

我收到了分段错误错误，请帮助。