View Compilation Error

0_0_18899790_23686.cpp: In function 'int main()':
0_0_18899790_23686.cpp:6:29: error: 'scanf' was not declared in this scope
         scanf("%d%d", &a, &b);  
                             ^
0_0_18899790_23686.cpp:16:31: error: 'printf' was not declared in this scope
                     printf(" ");  
                               ^
0_0_18899790_23686.cpp:17:33: error: 'printf' was not declared in this scope
                 printf("%02d", i);  
                                 ^
0_0_18899790_23686.cpp:19:20: error: 'printf' was not declared in this scope
         printf("\n");  
                    ^