foo.c:4:4: error: expected identifier or '(' before '?' token
 int?price[100];
    ^
foo.c:5:4: error: expected identifier or '(' before '?' token
 int?x[400], y[400];
    ^
foo.c:7:7: error: expected identifier or '(' before '?' token
 double?dis[400][400];
       ^
foo.c:8:1: error: expected identifier or '(' before '?' token
 ?
 ^
foo.c:13:1: error: expected identifier or '(' before '?' token
 ?
 ^
foo.c:77:1: error: expected identifier or '(' before '?' token
 ?
 ^