View Compilation Error

0_0_30251004_7473.cpp: In function 'void read(T&)':
0_0_30251004_7473.cpp:3:33: error: there are no arguments to 'getchar' that depend on a template parameter, so a declaration of 'getchar' must be available [-fpermissive]
     x=0;int f=0;char ch=getchar();
                                 ^
0_0_30251004_7473.cpp:3:33: note: (if you use '-fpermissive', G++ will accept your code, but allowing the use of an undeclared name is deprecated)
0_0_30251004_7473.cpp:4:53: error: there are no arguments to 'getchar' that depend on a template parameter, so a declaration of 'getchar' must be available [-fpermissive]
     while(ch<'0'||ch>'9')  {f|=(ch=='-');ch=getchar();}
                                                     ^
0_0_30251004_7473.cpp:5:64: error: there are no arguments to 'getchar' that depend on a template parameter, so a declaration of 'getchar' must be available [-fpermissive]
     while(ch>='0'&&ch<='9'){x=(x<<1)+(x<<3)+(ch^48);ch=getchar();}
                                                                ^