double quote not single quote

problem, how should I change these double string to single string. on other hands, change from string class to character class?

[madhan ravi]

Have told you many times , posting a screenshot is useless, please post the "actual" code instead.

Answer 1

[Star Strider]

Re-format your desired ouitput using the sprintf function.

Answer 2

[madhan ravi]

Directly use compose(...)