View Compilation Error

0_0_37767049_31153.cpp: In function 'long long int read()':
0_0_37767049_31153.cpp:9:5: error: 'T' was not declared in this scope
     T x=0,f=1;
     ^
0_0_37767049_31153.cpp:12:21: error: 'f' was not declared in this scope
         if(ch=='-') f=-1;
                     ^
0_0_37767049_31153.cpp:16:9: error: 'x' was not declared in this scope
         x=(x<<3)+(x<<1)+ch-'0';
         ^
0_0_37767049_31153.cpp:19:12: error: 'x' was not declared in this scope
     return x*f;
            ^
0_0_37767049_31153.cpp:19:14: error: 'f' was not declared in this scope
     return x*f;
              ^