View Compilation Error

0_0_27387602_3921.cpp:3:11: error: '::main' must return 'int'
 void main()
           ^
In file included from 0_0_27387602_3921.cpp:1:0:
0_0_27387602_3921.cpp: In function 'int main()':
0_0_27387602_3921.cpp:6:18: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
 while(gets(str)!=EOF)
                  ^
0_0_27387602_3921.cpp:7:4: error: invalid conversion from 'char*' to 'char' [-fpermissive]
 { p=str;
    ^
0_0_27387602_3921.cpp:9:10: error: invalid conversion from 'char*' to 'char' [-fpermissive]
 for(p=str+1;p!='\0';p++)
          ^