?? switch.c
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char x;/* Valid switch statement */#ifdef TEST1char foo(void){ switch(x) { char y; case 0: return 0; case 1: return 1; default: y = x+1; return y; }}#endif/* Error, duplicate cases */#ifdef TEST2char foo(void){ switch(x) { char y; case 0: /* IGNORE */ return 0; case 1: return 1; case 0: /* ERROR */ return 0; default: y = x; return y; }}#endif/* Error, more than one default */#ifdef TEST3char foo(void){ switch(x) { char y; case 0: return 0; case 1: return 1; default: /* IGNORE */ y = x; return y; default: /* ERROR */ return 2; }}#endif/* Warn about unreachable code */#ifdef TEST4char foo(void){ switch(x) { char y; x++; /* WARNING */ case 0: return 0; case 1: return 1; default: y = x; return x; }}#endif/* Warn about unreachable initializer */#ifdef TEST5char foo(void){ switch(x) { char y=1; /* WARNING */ case 0: return 0; case 1: return 1; default: return y; /* IGNORE */ }}#endif/* Error, missing switch */#ifdef TEST6char foo(void){ { case 0: /* ERROR */ return 0; case 1: /* ERROR */ return 1; default: /* ERROR */ return x; }}#endif/* Error, switch condition must be integral */#ifdef TEST7char foo(void){ float f; f=x; switch(f) /* ERROR */ { char y; case 0: return 0; case 1: return 1; default: y = x; return x; }}#endif/* Error, cases must be integral */#ifdef TEST8char foo(void){ switch(x) { char y; case 0.0: /* ERROR */ return 0; case 1: return 1; default: y = x; return x; }}#endif?? 快捷鍵說明
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