View Compilation Error

0_0_20962445_25389.cpp: In function 'int main()':
0_0_20962445_25389.cpp:42:25: error: expected primary-expression before '<' token
         sum=(sum-1)%9+1;<span style="font-family: Arial, Helvetica, sans-serif;">//也可调用modify函数</span>
                         ^
0_0_20962445_25389.cpp:42:26: error: 'span' was not declared in this scope
         sum=(sum-1)%9+1;<span style="font-family: Arial, Helvetica, sans-serif;">//也可调用modify函数</span>
                          ^