C$++$ Binary search array input I want to be able to input an array of $1$ or $25$ or $100$ is their a better way then how I did it$?$ cout $<<$ "Please input a number to find: $"$;

cin $>>$ n;

auto start $=$ chrono::steady$\_$clock::now$()$;

int binarySearch$($int arr$[],$ int l$,$ int r$,$ int n$)$;

$//$ Arrays are shorted $1,25,100$

$//$int arr$[]=\{2\}$;

$//$int arr$[]=\{0,2,4,6,8,10,12,14,16,18,20,22,24,26,27,28,29,30,31,32,33,34,35,36,38,40,42,\}$;

int arr$[]=\{0,2,4,6,8,10,12,14,16,18,20,22,24,26,27,28,29,30,31,32,33,34,35,36,38,40,42,$

$50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,89,90,91,92,93,94,95,96,97,$

$98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,$

$126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143\}$;

int x $=$ sizeof$($arr$)/$ sizeof$($arr$[0])$;

int result $=$ binarySearch$($arr$,0,$ x $-1,$ n$)$;

if $($result $==-1)\{$

cout $<<$ "Element is not present in array" $<<$ endl;

$\}$

else $\{$

cout $<<$ "Element is present at index $"<<$ result $<<$ endl;

$\}$

auto end $=$ chrono::steady$\_$clock::now$()$;

double elapsed$\_$time$\_$ns $=$ double$($chrono::duration$\_$cast $($end $-$ start$).$count$())$;

cout $<<$ "Elapsed Time$($s$)"<<$ elapsed$\_$time$\_$ns $/1$e$9<<"$ nanoseconds $"<<$ endl;