#include \x0d\int main( )\x0d\{\x0d\ double a, b;\x0d\ char op;\x0d\ scanf("%lf%c%lf", &a, &op, &b);\x0d\ switch (op)\x0d\ {\x0d\ case '+':\x0d\ printf("%lf + %lf = %lf\n", a, b, a + b);\x0d\ break;\x0d\ case '-':\x0d\ printf("%lf - %lf = %lf\n", a, b, a - b);\x0d\ break; \x0d\ case '*':\x0d\ printf("%lf * %lf = %lf\n", a, b, a * b);\x0d\ break;\x0d\ case '/':\x0d\ if (b != 0)\x0d\ printf("%lf / %lf = %lf\n", a, b, a / b);\x0d\ else\x0d\ printf("除數不能是0! \n");\x0d\ break;\x0d\ }\x0d\}
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