Question

C programming

1)

When setting a two-dimensional character array, how is the size (number of characters) in the second dimension set?

Select an answer:

• The number of elements are equal to the average size of all the strings.

• To the length of the longest string; you don't need to add one because the first array element is zero.

• To the length of the longest string, plus one for the null character.

• The second dimension is equal to the number of strings, plus one.

2)

Yuri wants to use constant Y in a for loop. Which of the following is valid?

Select an answer:

• for(y=0;y

• for(x=1;x

• for(y=0;y<20;y++)

• all of these answers

3)

Assume that 1 is TRUE and 0 is FALSE, which of the following logical evaluations is TRUE?

Select an answer:

• FALSE || FALSE

• !(TRUE || FALSE)

• !FALSE

• TRUE && FALSE

4)

Can you display a single character as a value?

Select an answer:

• Yes, by changing the printf() function's placeholder from %c to %d.

• Yes, by using a chtype function that output's the character's ASCII value.

• No, characters and values are separate data types in C.

• No, though you can use a chtype function to convert digits 0 to 9 to their numeric counterparts.

5)

Which of the following is true?

Select an answer:

• All arguments passed to a function must be variables.

• A function's arguments must all be of the same variable type.

• Arguments passed to a function are treated as variables within the function.

• None of these are true.

Answer 1

1) When setting a two-dimensional character array, how is the size (number of characters) in the second dimension set?

Ans: To the length of the longest string, plus one for the null character.

Explanation: In C, there is no explicit string data type. So strings are stored as character arrays and to explicitly define end of the string '\0' character is appended to original char array. so string "Hello" will be stored in char array of size 6 and like "Hello\0".

2)  Yuri wants to use constant Y in a for loop. Which of the following is valid?

Ans: for(x=1;x

Explanation: In C, constants are read only data types. So value of a constant can only be read and can't be updated. Only option in which y was not updated was the above one. Note that constants can be read in for loop but any change in value like reassignment, pre/post increments are not allowed.

3)  Assume that 1 is TRUE and 0 is FALSE, which of the following logical evaluations is TRUE?

Ans:  !FALSE

Explanation: In C, _Bool datatype supports true and false values. For that you have to include <stdbool.h> header. Above expression when evaluated gives true value because "!"

4) Can you display a single character as a value?

Ans: Yes, by changing the printf() function's placeholder from %c to %d.

Explanation: In C, you can use format specifiers %c for character and %d for integer. Character are stored as ASCII values between 0 to 255 range. So if a single character when printed with %c specifier outputs character and when printed with %d specifier outputs its ASCII value. e.g. printf("%c",'a') outputs a and printf("%d",'a') outputs 97, ASCII value of 'a'.

5) Which of the following is true?​​​​​​​

Ans: All arguments passed to a function must be variables.

Explanation: In C, you can only pass variables as parameter to function. Though if you want to pass functions, you can store a pointer to that function and pass it as variable to be used to call other function in that function.

Note: In 5^th question option 3 is ambiguous because it is not specified if it call by reference or call by value. So in given scenario above specified statement hold true.

Thank you, Hope that helps!