/in/foo.cc: In function 'int main()':
/in/foo.cc:12:5: error: expected initializer before 'unsigned'
     unsigned int i;
     ^~~~~~~~
/in/foo.cc:17:13: error: 'i' was not declared in this scope
         for(i=1;i<strlen(a)-1;i++)
             ^
/in/foo.cc:26:19: error: 'z' was not declared in this scope
             else {z=c;c=d;d=z;c+=b[j]*d;}
                   ^
/in/foo.cc:39:13: error: 'i' was not declared in this scope
         for(i=0;i<strlen(a);i++)
             ^
/in/foo.cc:52:22: error: 'z' was not declared in this scope
           c-=d*(c/d);z=c;c=d;d=z;
                      ^