do while loop which solve 1*2*3*.....*20

Answer 1

i would suggest using a for loop though, because it's good practice to use a for loop if you know exactly how many repetitions you need:

int sum = 1;

for( int i = 1; i <= 20; i++)
{
sum *= i;
}

Answer 2

This is straight forward:

unsigned i = 1;
unsigned result = 1;
do {
result = result * i;
++i;
} while (i < 20+1);

Answer 3

you can omit the 20 + 1 with 21 for less calculations

Answer 4

Write for,do_while,and while statements to compute the following sums and product.1*2*3*...*20

Answer 5

Do while loop which 1*2*3..........*20