Question

Which of the following statements will not execute a DO loop?

a. do i=8, 10, 4, 14;
b. do i=.30 to .20 by -.1;
c. do i=(x+10) to x;
d. do i=-1 to -3 by -1;

Answer 1

The DO loop statement that will not execute is a. do i=8, 10, 4, 14; because it has an incorrect syntax with four parameters instead of the required two or three for a standard DO loop.

Step-by-step explanation:

The statement that will not execute a DO loop is: a. do i=8, 10, 4, 14;. This is because the syntax of the DO loop is incorrect. In most programming languages, a DO loop (also known as a FOR loop) has a starting value, an end value, and an optional step increment, but it does not support four parameters as shown in the statement.

Correct syntax examples for DO loops:

• do i=1 to 10: This loop will start at 1 and end at 10, incrementing by 1.
• d. do i=-1 to -3 by -1: This loop will start at -1 and end at -3, decrementing by 1.

Syntax such as b. do i=.30 to .20 by -.1 and c. do i=(x+10) to x are also potentially valid. However, part a's syntax does not match standard loop constructs, making it the one that would not execute.