foo.cc: In function 'int main()':
foo.cc:6:19: warning: right operand of comma operator has no effect [-Wunused-value]
    6 |         cin>>x1,x2;
      |                   ^
foo.cc:7:9: error: 'y1' was not declared in this scope; did you mean 'x1'?
    7 |         y1=x1+x2;
      |         ^~
      |         x1
foo.cc:8:9: error: 'y2' was not declared in this scope; did you mean 'x2'?
    8 |         y2=x1*x2;
      |         ^~
      |         x2
foo.cc:9:9: error: 'y3' was not declared in this scope
    9 |         y3=x1%x2;
      |         ^~

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