View Compilation Error

0_0_16457545_15676.cpp: In function 'int main()':
0_0_16457545_15676.cpp:5:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&n)!=EOF){
                        ^
0_0_16457545_15676.cpp:5:27: error: 'EOF' was not declared in this scope
     while(scanf("%d",&n)!=EOF){
                           ^
0_0_16457545_15676.cpp:19:21: error: 'printf' was not declared in this scope
     printf("%d",a[m]); 
                     ^