foo.cc: In function 'int main()':
foo.cc:7:9: error: 'ii' was not declared in this scope
     For(ii,1,T)
         ^~
foo.cc:7:5: error: 'For' was not declared in this scope
     For(ii,1,T)
     ^~~
foo.cc:6:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&T);
     ~~~~~^~~~~~~~~

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