close
![case case](https://imageproxy.pixnet.cc/imgproxy?url=https://pic.pimg.tw/hfnkiki/1352451292-1595252190.jpg)
#include
using namespace std;
int main()
{
int a,b;
char input;
Start:
cout >a;
cout >b;
cout >input;
switch(input)
{
case '+':
cout
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