/in/foo.cc: In function 'int main()':
/in/foo.cc:6:9: error: 'i' was not declared in this scope
     for(i=0;i<13;i++)
         ^
/in/foo.cc:17:14: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if((s==10)&&(a[12]=='X')||(s==a[12]-48))
       ~~~~~~~^~~~~~~~~~~~~~