View Compilation Error

0_0_38608522_23021.cpp: In function 'int read()':
0_0_38608522_23021.cpp:8:7: error: conflicting declaration 'char x'
  char x;
       ^
0_0_38608522_23021.cpp:7:6: note: previous declaration as 'int x'
  int x=0,f=1;
      ^
0_0_38608522_23021.cpp:9:17: error: 'c' was not declared in this scope
  while(!isdigit(c))if((c=getchar())=='-')f=-f;
                 ^
0_0_38608522_23021.cpp:10:16: error: 'c' was not declared in this scope
  while(isdigit(c))x=(x<<1)+(x<<3)+(c^48),c=getchar();
                ^