Run id: 122541

Main.cc: In function 'int main()':
Main.cc:8:25: warning: left operand of comma operator has no effect [-Wunused-value]
    for(int i=0,j=len-1;i=0;i++,j--)
                         ^
Main.cc:10:17: error: invalid operands of types 'char' and 'const char [2]' to binary 'operator-'
     sum+=((a[j]-"0")*pow(2,i));
                 ^