View Compilation Error

0_0_16469004_28432.cpp: In function 'void read(int&)':
0_0_16469004_28432.cpp:4:22: error: 'getchar' was not declared in this scope
     while((c=getchar()) < '0' || c > '9');
                      ^
0_0_16469004_28432.cpp:6:38: error: 'getchar' was not declared in this scope
         x = x*10+(c-'0'),c = getchar();
                                      ^