C语言之switch计算a,b的值

Question

a，b的值为多少

​
#include<stdio.h>
int main()
{
int x=1, y=0, a=0, b=0;
switch (x)
{
case 1:
        switch (y)
        {
        case 0: a++; break;
        case 1: b++; break;
}
case 2: a++; b++; break;
case 3: a++; b++;
}
printf(“a=%d,b=%d\n”, a, b);
return 0;
}

​

```

Answer 1

a=2,b=1

• x = 1, y = 0
  • case 1:
    • case 0 : a++; a = 1，退出这个swtich
  • case 2: a++; b++;
    • a = 2 , b = 1 , 退出外层switch
• 最后打印 a=2,b=1