/in/foo.c: In function 'main':
/in/foo.c:16:29: warning: 'b' is used uninitialized [-Wuninitialized]
   16 |                 a[i][j]=b[j][i];
      |                         ~~~~^~~
/in/foo.c:7:13: note: 'b' declared here
    7 |         int b[3][2];
      |             ^