/in/foo.c: In function 'main':
/in/foo.c:8:33: warning: unused variable 'y' [-Wunused-variable]
  int a[100][100],m,n,i,j,temp,x,y;
                                 ^
/in/foo.c:8:31: warning: unused variable 'x' [-Wunused-variable]
  int a[100][100],m,n,i,j,temp,x,y;
                               ^
/in/foo.c:8:26: warning: unused variable 'temp' [-Wunused-variable]
  int a[100][100],m,n,i,j,temp,x,y;
                          ^~~~