/in/foo.c: In function 'main':
/in/foo.c:50:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=]
     printf("%d",sum);
              ^
/in/foo.c:49:5: warning: 'flag' may be used uninitialized in this function [-Wmaybe-uninitialized]
     printf("%d\n",student[flag].money);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~