foo.cpp: In function 'void mto1(int, int)':
foo.cpp:21:21: error: expected ';' before 'b'
 tr[0][n] = x + a[n] b[m];
                     ^
foo.cpp:23:15: error: expected ';' before numeric constant
 tr[0][n] -= x 10;
               ^
foo.cpp: In function 'void mtom()':
foo.cpp:35:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(int i = 1; i <= strlen(in[1]); i++)
                                 ^