$7\mathrm{.}5$ LAB: Checker for integer string

Forms often allow a user to enter an inteyer. Write a program that takes in a string representing an integer as input, and outputs Yes if every character is a digit $0-9$ or No otherwise.

Ex: If the input is:

$1995$

the output is:

Yes

Ex: If the input is:

$42,000$

or any string with a non$-$integer character, the output is:

No

$535744\mathrm{.}3946410\mathrm{.}9x3zqy7$

LAB

$7\mathrm{.}5\mathrm{.}1$: LAB: Checker for integer string

$\frac{3}{10}$

ACTIVITY

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