View Compilation Error

0_0_34873270_2485.cpp: In function 'int main()':
0_0_34873270_2485.cpp:10:20: error: invalid conversion from 'char*' to 'int' [-fpermissive]
     while((a=gets(s))!=EOF)
                    ^
0_0_34873270_2485.cpp:15:27: error: 'n' was not declared in this scope
             for(int j=0;j<n-i;j++)
                           ^
0_0_34873270_2485.cpp:17:23: error: invalid types 'int[int]' for array subscript
                 if(a[i]>a[i+1])
                       ^
0_0_34873270_2485.cpp:17:30: error: invalid types 'int[int]' for array subscript
                 if(a[i]>a[i+1])
                              ^
0_0_34873270_2485.cpp:19:26: error: invalid types 'int[int]' for array subscript
                     t=a[i];
                          ^
0_0_34873270_2485.cpp:20:24: error: invalid types 'int[int]' for array subscript
                     a[i]=a[i+1];
                        ^
0_0_34873270_2485.cpp:20:31: error: invalid types 'int[int]' for array subscript
                     a[i]=a[i+1];
                               ^
0_0_34873270_2485.cpp:21:26: error: invalid types 'int[int]' for array subscript
                     a[i+1]=t;
                          ^