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

Onlinegdb 51 likes is an online compiler and debugger tool for CC++ languages It is world's first online IDE which gives debugging

Code Not working in VS Code but works in OnlineGDB · p=1 causes buffer overrun error · @ · don't use online

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

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