// switch.c
#include <stdio.h>
 
int main(void)
{
    int a;
    scanf("%d", &a);  // <= 0
 
    switch(a) {
    case 0:      // breakが無いのでfall through(case 1に行く)
        a = 10;  // ここでaが10になってもcase 10には行かない
        printf("aは0\n");
    case 1:      // fall through(case 2行く)
    case 2: 
        printf("aは2以下\n");  
        break;   // breakがあるのでここで終了
    case 10:  
        printf("aは10\n");
        break;   // breakがあるのでここで終了
    default:
        printf("aはよくわからない");
        break;
    }
 
    return 0;
}

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MA==

Standard input is empty