$ perl -wle 'print (1 == 0) ? "Yes" : "No"'
print (...) interpreted as function at -e line 1.
Useless use of a constant ("Yes") in void context at -e line 1.
Useless use of a constant ("No") in void context at -e line 1.

$ perl -wle 'print +(1 == 0) ? "Yes" : "No"'
No
$ perl -we 'printf (1 == 0) ? "Yes\n" : "No\n"'
printf (...) interpreted as function at -e line 1.
Useless use of a constant ("Yes\n") in void context at -e line 1.
Useless use of a constant ("No\n") in void context at -e line 1.
$ perl -we 'printf +(1 == 0) ? "Yes\n" : "No\n"'
No