foo.cc: In function 'int main()':
foo.cc:7:20: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
    7 |         while(2^i-1<N) {a[i]=2^i-1;i++;}
      |                 ~~~^~
foo.cc:7:33: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
    7 |         while(2^i-1<N) {a[i]=2^i-1;i++;}
      |                                ~^~
foo.cc:9:17: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
    9 |         p=N-(2^i-1)
      |                ~^~
foo.cc:9:20: error: expected ';' before 'i'
    9 |         p=N-(2^i-1)
      |                    ^
      |                    ;
   10 |         i=1;
      |         ~           

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