C语言switch语句问题

Di诺 · 发表于 2014-8-23 21:46:25

[mw_shl_code=c,true]u8 TouchHandle(void) { u16 k=0; TouchScrDev.scan(0); if(TouchScrDev.sta&Touch_DOWN) { TouchScrDev.sta&=~(1<<6); if(keysign) { if(TouchScrDev.x<=111) { if(TouchScrDev.x<=51) k=147; else k=258; } else if(TouchScrDev.x<239) { if(TouchScrDev.x<=171) k=369; else k=0; } if(TouchScrDev.y>=200) { if(TouchScrDev.y>=240) { if((TouchScrDev.y>=280)&&(TouchScrDev.y<=319)) k=k+1230; else k=k+4560; } else k=k+7890; } } TouchScrDev.x=0;TouchScrDev.y=0; } switch(k) { case 1337: return 1;break; case 4707: return 2;break; case 8037: return 3;break; case 1488: return 4;break; case 4818: return 5;break; case 8148: return 6;break; case 1599: return 7;break; case 4929: return 8;break; case 8259: return 9;break; case 7890: return 10;break; case 4560: return 11;break; case 1230: return 12;break; default:return 0;break; } } [/mw_shl_code]

这是我写的虚拟键盘程序，判断触摸位置返回键值。编译后keil提示
..\APP\app.c(187): warning: #111-D: statement is unreachable
..\APP\app.c(188): warning: #111-D: statement is unreachable
..\APP\app.c(189): warning: #111-D: statement is unreachable
..\APP\app.c(190): warning: #111-D: statement is unreachable
..\APP\app.c(191): warning: #111-D: statement is unreachable
..\APP\app.c(192): warning: #111-D: statement is unreachable
..\APP\app.c(193): warning: #111-D: statement is unreachable
..\APP\app.c(194): warning: #111-D: statement is unreachable
..\APP\app.c(195): warning: #111-D: statement is unreachable
..\APP\app.c(196): warning: #111-D: statement is unreachable
..\APP\app.c(197): warning: #111-D: statement is unreachable
..\APP\app.c(198): warning: #111-D: statement is unreachable
..\APP\app.c(199): warning: #111-D: statement is unreachable

就是说程序无法进入switch选择语句，主函数直接一个while（1）调用本函数，可是我没发现语法错误啊，请大家帮帮忙。