foo.cc: In function 'int main()':
foo.cc:36:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(w-h>=0)
   ^~
foo.cc:38:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
    w=w-h-(w-h-((w-h)%100))+300;
    ^
foo.cc:52:17: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
            if (w-m>=0)
                ~^~

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