Which of the following statements displays the message "Age:...

Which of the following statements displays the message "Age: 35 " on a Web page? (Assume that the $$\$ $$age variable contains the number 35 .)
a. print "Age: $age\n";
b. printf "Age: %d\n", $age;
c. printf "Age: %d, $$\$ $$age\n";
d. both a and b

Key Concepts

Variable Interpolation in Strings

In many programming languages, including PHP, variables enclosed within double-quoted strings are automatically replaced by their actual values at runtime. This feature allows developers to embed variables directly into strings without needing explicit concatenation.

Print and Printf Functions

The print function is used to output strings to the browser or command line, often interpreting variables within double-quoted strings. The printf function, on the other hand, supports formatted output using placeholders, giving developers more control over how data is presented.

Format Specifiers

Format specifiers, like %d, are placeholders used in formatted output functions such as printf. They define the data type and formatting of the variable’s value, ensuring that the output matches the required format, such as displaying an integer in decimal format.

Transcript

00:01 Okay, so in this question we have a c program and we want to know what this program will output.

00:12 So we're going to go through it line by line.

00:17 I'm going to use pale blue.

00:19 So here we just declared an integer variable name i with value of two.

00:25 So we're going to have i is equal to two.

00:34 And then we create a new scope.

00:36 So when you open a curly bracket, you open and you close a new scope.

00:45 So open a new scope and then later we will close the scope.

01:03 So now everything that happens in this scope between those curly brackets, anything that happens between those curly brackets cannot be seen by what's outside the curly bracket.

01:15 Has precedence so over what's happening outside the curly bracket so it's this is independent of what has come before and after and what has come what will come after has no access to the information in this scope so in this scope we say uh basically we gave value i equals 4 and j equals 5 so it's pretty straightforward and then we print the value of of i and j to a terminal or console window depending on how you want to call it so here i'm going to quickly draw a say in orange i'm going to quickly draw a terminal window here you go one more side okay this is the terminal window so usually terminal window will have something like this and we say print i and j so it will simply print four and five and then we exit the scope that we created earlier and we say print i and print j what is j so print i and j again except there's a problem what is j because j was only declared in the scope that we closed and as we say, when you declare something in a scope, it is not, you cannot use it outside of the scope.

03:55 So we don't know what j is.

04:00 We don't know what j is.

04:14 It is not in the main scope...

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