为什么switch里面的部分printf无法输出

#include<stdio.h>
int main()
{
int a, b ,n;
printf("Enetr a two-digit number:");
scanf_s("%1d1%d", &a, &b);
n = a * 10 + b;
printf("You entered the number ");
if (a != 1)
{
switch (a) {
case 2:printf("twenty-"); break;
case 3:printf("thirty-"); break;
case 4:printf("forty-"); break;
case 5:printf("fifty-"); break;
case 6:printf("sixty-"); break;
case 7:printf("seventy-"); break;
case 8:printf("eight-"); break;
case 9:printf("nity-"); break;
}
switch (b) {
case 1:printf("one."); break;
case 2:printf("two."); break;
case 3:printf("three."); break;
case 4:printf("four."); break;
case 5:printf("five."); break;
case 6:printf("six"); break;
case 7:printf("seven."); break;
case 8:printf("eight."); break;
case 9:printf("nine."); break;
}
}
else{
switch (n) {
case 11:printf("eleven."); break;
case 12:printf("twelve."); break;
case 13:printf("thirteen."); break;
case 14:printf("fourteen."); break;
case 15:printf("fifteen."); break;
case 16:printf("sixteen."); break;
case 17:printf("seventeen."); break;
case 18:printf("eighteen."); break;
case 19:printf("nineteen."); break; fflush(stdout);
}
}
return 0;
}

输入部分参数写错了,改为scanf_s("%1d%1d", &a, &b);即可
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