运行下面,从键盘输入数据为"2,13,5 ", 则输出结果是( )。 #include main( ) { int a,b,c; scanf("%d,%d,%d",&a,&b,&c); switch(a) { case 1: printf("%d\n",b+c); break; case 2: printf("%d\n",b-c); break; case 3: printf("%d\n",b*c); break; case 4: { if(c!=0) {printf("%d\n",b/c);break;} else {printf("error\n");break;} } defualt: break; } }