View Compilation Error

0_0_33409812_26466.cpp: In function 'bool cmp(student, student)':
0_0_33409812_26466.cpp:16:5: error: expected ';' before 'else'
     else return a.num>b.num;
     ^
0_0_33409812_26466.cpp: In function 'int main()':
0_0_33409812_26466.cpp:44:69: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
         printf("%-10s %2d %4d\n",stu[i].name,stu[i].num,stu[i].score);
                                                                     ^