https://likebd.com/c-programming/655/%e0%a7%ab-%e0%a7%a6-%e0%a6%b8%e0%a7%8d%e0%a6%9f%e0%a7%87%e0%a6%9f%e0%a6%ae%e0%a7%87%e0%a6%a8%e0%a7%8d%e0%a6%9f-statement-%e0%a6%b8%e0%a6%bf-%e0%a6%aa%e0%a7%8d%e0%a6%b0%e0%a7%8b%e0%a6%97%e0%a7%8d/attachment/control-flow-statements/