为什么这个九九乘法表一直循环

Question

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

int main()
{ int a,b,N;
scanf("%d",&N);
while(1<=N&&N<=9){
for(a=1;a<=N;a++){
for(b=1;b<=a;b++){
printf("%d*%d=%-4d ",a,b,a*b); }
printf("\n");}
}

return 0;

}

Answer 1

while(1<=N&&N<=9)因为这个，你输入大于0小于等于9的数一直满足条件所以一直进入循环了，把while换成if