#include <stdio.h> int main() { double a,b; char c; scanf("%lf%c%lf",&a,&c,&b); switch(c) { case '+': printf("%.4lf+%.4lf=%.4lf\n",a,b,a+b); break; case '-': printf("%.4lf-%.4lf=%.4lf\n",a,b,a-b); break; case '*': printf("%....