View Compilation Error

0_0_13465498_24888.cpp: In function 'int main()':
0_0_13465498_24888.cpp:4:27: error: 'scanf' was not declared in this scope
 while(~scanf("%d %d",&a,&b))
                           ^
0_0_13465498_24888.cpp:5:18: error: 'printf' was not declared in this scope
 printf("%d\n",a+b);
                  ^