foo.cc: In function 'int main()':
foo.cc:7:9: error: 't' was not declared in this scope
    7 |         t=a*b;
      |         ^
foo.cc:8:9: error: 'r' was not declared in this scope
    8 |         r=a%b;
      |         ^
foo.cc:5:17: warning: unused variable 'max' [-Wunused-variable]
    5 |         int a,b,max,min;
      |                 ^~~
foo.cc:5:21: warning: unused variable 'min' [-Wunused-variable]
    5 |         int a,b,max,min;
      |                     ^~~

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