View Compilation Error

0_0_31228750_3326.cpp: In function 'int main()':
0_0_31228750_3326.cpp:4:22: error: 'scanf' was not declared in this scope
 while((~scanf("%d",&a)))
                      ^
0_0_31228750_3326.cpp:12:16: error: 'printf' was not declared in this scope
 printf("%d\n",c);
                ^