What will the strings: "[phone]"[6] = 7 "[phone]"[6] == 7

Let's consider the expressions:

"[phone]"[6] = 7
"[phone]"[6] == 7

The string "[phone]" is a string literal representing an array of characters: {'[', 'p', 'h', 'o', 'n', 'e', ']', '\0'}. Indexing starts at 0, so:

• [phone][0] = '['
• [phone][1] = 'p'
• ...
• [phone][6] = ']'

The first expression:

"[phone]"[6] = 7;

tries to assign the value 7 to the element with index 6 in the string literal. However, string literals in C/C++ are usually stored in read-only memory, and attempting to modify them leads to undefined behavior (often a segmentation fault). The compiler may issue a warning or error.

The second expression:

"[phone]"[6] == 7

compares the character ']' (ASCII code 93) with the number 7. The result will be false (0), since 93 != 7.

In summary:

• Assigning "[phone]"[6] = 7 is incorrect and leads to an error.
• Comparing "[phone]"[6] == 7 results in false.

If you need to modify characters, you should use a mutable array, for example:

char phone[] = "[phone]";
phone[6] = 7; // correct