} } 13.
#include
int a=2,b=7,c=5; switch (a>0){
case 1: switch (b<0){
case 1: printf(\ case 2: printf(\ }
case 0: switch (c==5){
case 1: printf(\ default : printf(\ }
default : printf(\ }
printf(\ return 0; }
14. #include
int main() {
int a=0,b=1,c=0,d=20; if(a) d=d-10; else if (!b)
if(!c) d=15; else d=25; printf(\ return 0; } 15. #include
{ int a=1; switch(a){
case 0: printf(\ case 1:printf(\ case 2:printf(\ }
return 0; } 16. #include
y = x>12 ? x + 10 : x - 12; printf(\ return 0; } 输入：12<回车>
17. #include
float x, y; char op; double r;
scanf(\ switch(op)
{ case '+': r = x + y; break; case '-': r = x - y; break; case '*': r = x * y; break; case '/': r = x / y; break; }
printf(\ return 0; } 输入：3.5<回车> 18. #include \ void main( ) {
int a=7; if(a>9 || a<10) a=a/3; else a=a%3; printf(\ }
19. #include
int a=20; switch(a%3) { case 0: printf(\ case 1: printf(\ case 2: printf(\ default: printf(\ }
printf(\ }
20. #include
int a=2,b=5,c=8,t;
if ( a < b ) { t = a; a = b; b = t; } if ( b < c ) { t = b; b = c; c = t; } if ( a < b ) { t = a; a = b; b = t; } printf( \ } 解答: 1. 运行结果：