View Compilation Error

0_0_19045645_9088.cpp: In function 'int main()':
0_0_19045645_9088.cpp:4:25: error: 'scanf' was not declared in this scope
     while(scanf("%d", &n) != EOF) {  
                         ^
0_0_19045645_9088.cpp:4:30: error: 'EOF' was not declared in this scope
     while(scanf("%d", &n) != EOF) {  
                              ^
0_0_19045645_9088.cpp:12:32: error: 'printf' was not declared in this scope
             printf("%d\n", a[m]);             
                                ^