View Compilation Error

0_0_31695215_30223.cpp: In function 'int main()':
0_0_31695215_30223.cpp:21:10: error: expected unqualified-id before 'case'
      int case, m, n;
          ^
0_0_31695215_30223.cpp:22:20: error: expected primary-expression before 'case'
      scanf( "%d", &case );
                    ^
0_0_31695215_30223.cpp:24:13: error: expected primary-expression before 'case'
      while( case-- )
             ^
0_0_31695215_30223.cpp:24:13: error: expected ')' before 'case'
0_0_31695215_30223.cpp:24:20: error: expected primary-expression before ')' token
      while( case-- )
                    ^
0_0_31695215_30223.cpp:24:13: error: case label '<expression error>' not within a switch statement
      while( case-- )
             ^
0_0_31695215_30223.cpp:24:20: error: expected ':' before ')' token
      while( case-- )
                    ^
0_0_31695215_30223.cpp:24:20: error: expected primary-expression before ')' token