View Compilation Error

0_0_23005892_14996.cpp: In function 'int main()':
0_0_23005892_14996.cpp:5:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&n)!=EOF)
                        ^
0_0_23005892_14996.cpp:5:27: error: 'EOF' was not declared in this scope
     while(scanf("%d",&n)!=EOF)
                           ^
0_0_23005892_14996.cpp:23:37: error: 'printf' was not declared in this scope
                 printf("%d ",a[i][j]);
                                     ^
0_0_23005892_14996.cpp:24:28: error: 'printf' was not declared in this scope
                 printf("\n");
                            ^