View Compilation Error

0_0_29352743_11575.cpp: In function 'int main()':
0_0_29352743_11575.cpp:5:34: error: 'scanf' was not declared in this scope
     while(scanf("%d%d%d",&a,&b,&n)&&a&&b&&n)
                                  ^
0_0_29352743_11575.cpp:19:35: error: 'printf' was not declared in this scope
                 printf("%d\n",f[i]);
                                   ^
0_0_29352743_11575.cpp:21:35: error: 'printf' was not declared in this scope
                 printf("%d\n",f[n]);
                                   ^
0_0_29352743_11575.cpp:24:25: error: 'printf' was not declared in this scope
             printf("1\n");
                         ^