一道关于C语言程序的题 程序题main(){ float a,b; char c; printf("input expression: a+(-,*,/)b \n"); switch() { case '+': printf("%f\n",a+b);break; case '-': printf("%f\n",a-b);break; case '*': printf("%f\n",a*b);break; case '/': printf("%f\n",a/b);break;