View Compilation Error

0_0_22373673_10987.cpp: In function 'int main()':
0_0_22373673_10987.cpp:4:21: error: 'scanf' was not declared in this scope
 scanf("%d%d", &a, &b);
                     ^
0_0_22373673_10987.cpp:6:17: error: 'printf' was not declared in this scope
 printf("%d\n", c);
                 ^