I'm trying to join "ip-api.com/json/" and declared char "ip_address" but "ip-api.com/json/" is underlined red and says:
argument of type "const char *" is incompatible with parameter of type "char *"
How can it be done?
"ip-api.com/json/" isn't a variable, it's a string literal. You can't modify a string literal - how could that possibly make sense?
Let's say what you wrote was legal. Where would the result of the concatenation be? How could you use that result?
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Wow. It's almost if there were a good reason why people get pissed off by crossposting questions to multiple sites...
Is it illegal to learn ip address?