View Compilation Error

0_0_15908321_13499.cpp: In function 'int main()':
0_0_15908321_13499.cpp:5:24: error: 'scanf' was not declared in this scope
  while(scanf("%d%*c",&t)!=EOF){
                        ^
0_0_15908321_13499.cpp:5:27: error: 'EOF' was not declared in this scope
  while(scanf("%d%*c",&t)!=EOF){
                           ^
0_0_15908321_13499.cpp:14:19: error: 'printf' was not declared in this scope
   printf("%dn",sum);
                   ^