Question

how to Create a while loop

Answer 1

while (condition) ( < > =< => = !+) 
{
    code block
}

some think like this 

Answer 2

For C/C++ , C# for while loop has the same layout. 

while ( /*condition*/ )
{
// TO DO
}
for e.g:

int main()
 {

int sum = 0, i = 0;

//While loop
while (i <= 100)
             sum += i++;

printf("Sum %d", sum);

getchar();

return 0;

}
This code will sum from 0 to 100 ( Sigma from x = 0 to 100 of x)