想要当输入Y/y时，循环继续；输入N/n时，循环结束，应该怎么写while里面的语句？

Question

#include<stdio.h>
int main(void)
{
double a,b;
char op;
scanf("%lf %c %lf",&a,&op,&b);
do{

    switch(op)
    {
        case'+':printf("%f",a+b);break;
         case'-':printf("%f",a-b);break;
        case'*':printf("%f",a*b);break;
        case'/':
                if(b==0)
                   printf("No\n");
                else
                   printf("%f",a/b);
                
        }
    printf("Do you want to continue(Y/N or y/n)?\n");

}while();

   
return 0;

}

Answer 1

#include<stdio.h>
int main(void)
{
double a,b;
char op;
char flag;
do{
    scanf("%lf %c %lf",&a,&op,&b);
    switch(op)
    {
        case'+':printf("%f",a+b);break;
         case'-':printf("%f",a-b);break;
        case'*':printf("%f",a*b);break;
        case'/':
                if(b==0)
                   printf("No\n");
                else
                   printf("%f",a/b);
        }
    printf("Do you want to continue(Y/N or y/n)?\n");
    scanf("%c",&flag);
}while(flag=='Y'||flag=='y');
   
return 0;
}