View Compilation Error

0_0_33683676_19682.cpp: In function 'int main()':
0_0_33683676_19682.cpp:4:20: error: 'scanf' was not declared in this scope
 while(scanf("%d",&n)&&n){
                    ^
0_0_33683676_19682.cpp:13:43: error: 'printf' was not declared in this scope
         if(p[i][j]!=0)printf("%3d",p[i][j]);
                                           ^
0_0_33683676_19682.cpp:14:26: error: 'printf' was not declared in this scope
         else printf("   ");
                          ^
0_0_33683676_19682.cpp:16:16: error: 'printf' was not declared in this scope
     printf("\n");
                ^