Considering C++ language, what is the difference between While loop and do...while loop ?

the differnce between while loop and do while loop is simply with a do while loop your program tells the compliler to do whatever you want to first then checking your condtion..

but the while it will check your condtion first

for example:

while( x !=) {

     x = x+5;

}

do {

x * x;

}while(x!=);