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

onlinegdb  OnlineGDB for providing a robust platform that enriches the learning experience of readers of The ABC of C Through the seamless integration of QR codes c #cprogramming #onlinegdb #compuerengineering #programming #coding

OnlineGDB is described as 'Com is an online compiler and debugger tool for CC++ Code, compile and run program in browser and debug program OnlineGDB is online IDE with C++ compiler Quick and easy way to compiler c++ program

Use Debugger in OnlineGDB limjetwee #limjetwee #coding #programming  Code Not working in VS Code but works in OnlineGDB · p=1 causes buffer overrun error · @ · don't use online