Why is onlineGDB not giving the same result as another compiler?

onlinegdp is an online compiler and debugger tool for CC++ languages It is world's first online IDE which gives debugging facility with embedded gdb

Navigate OnlineGDB and run Python programs; Take input and manipulate output; Create your own simple Python mini-project Register Add to Favorites Share This onlinegdp Welcome to GDB Online GDB online is an online compiler and debugger tool for C, C++, Python, PHP, Ruby, C#, VB, Perl, Swift, Prolog, Javascript, Pascal,