In the Pascal ABC program, write a program that calculates the product of n numbers entered from the keyboard.

You cannot specify a variable that is a decimal fraction as the counter of a for loop. This variable must be integer.
We ask the user for the value of the variable n:
readln (n);
The variable containing the product of all numbers will be the multi_a variable.
Despite the fact that its value will depend on what numbers the user of this program will enter, at the first stage you need to give this variable the value of one, otherwise, when multiplied by zero, the entire product will be zero.
After that, you need to write in the loop:
multi_a: = multi_a + multi_a;