Main.cc: In function ‘int main()’:
Main.cc:20:16: error: expected primary-expression before ‘||’ token
while(n <= || n >= 5000) scanf("%d",&n);
^~
Main.cc: In function ‘void input(int&)’:
Main.cc:14:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
~~~~~^~~~~~~~~
Main.cc: In function ‘int main()’:
Main.cc:19:14: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
int n; scanf("%d",&n);
~~~~~^~~~~~~~~
Main.cc:20:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
while(n <= || n >= 5000) scanf("%d",&n);
~~~~~^~~~~~~~~