foo.cpp: In function 'int main()':
foo.cpp:12:26: error: 'scanf' was not declared in this scope
 while(1==scanf("%d",&nNum))
                          ^
foo.cpp: In function 'void vInput(int*, int)':
foo.cpp:24:20: error: 'scanf' was not declared in this scope
 scanf("%d",&nArr[i]);
                    ^
foo.cpp: In function 'void vOut(int)':
foo.cpp:56:19: error: 'printf' was not declared in this scope
 printf("%d\n",nOut);
                   ^