Main.cc: In function 'int main()':
Main.cc:7:28: error: 'isPalindrome' was not declared in this scope
if (isPalindrome(number)) {
^
Main.cc:5:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &number);
^