7-04-2024 quiz

The keyword used to transfer control from a function back to the calling function is

• back

• terminate
• return

• end

Answer explanation

The keyword return is used to transfer control from a function back to the calling function.

Point out the error in the program

• Missing parenthesis in return statement

• The function should be defined as int f(int a, int b)

• Redeclaration of a

• None of above

Answer explanation

f(int a, int b) The variable a is declared in the function argument statement.

int a; Here again we are declaring the variable a. Hence it shows the error "Redeclaration of a"

A function cannot be defined inside another function

• True

• False

Answer explanation

A function cannot be defined inside the another function, but a function can be called inside a another function.

Which of the following is true about the size of C data types?

• sizeof(char) <= sizeof(int) <= sizeof(long)

• sizeof(double) <= sizeof(float)

• sizeof(char) > sizeof(short)

• sizeof(int) == sizeof(float)

What is the correct way to declare a comment in C?

• <!-- This is a comment -->

• /* This is a comment */

• // This is a comment

• Both B and C are correct

Functions cannot return more than one value at a time

• True

• False

Answer explanation

True, A function cannot return more than one value at a time. because after returning a value the control is given back to calling function.

What will be the output of the program?

• Print 5, 4, 3, 2, 1

• Infinite loop

• Print 1, 2, 3, 4, 5

• Print 5, 4, 3, 2, 1, 0

Answer explanation

Step 1: int no=5; The variable no is declared as integer type and initialized to 5.

Step 2: reverse(no); becomes reverse(5); It calls the function reverse() with '5' as parameter.

The function reverse accept an integer number 5 and it returns '0'(zero) if(5 == 0) if the given number is '0'(zero) or else printf("%d,", no); it prints that number 5 and calls the function reverse(5);.

The function runs infinetely because the there is a post-decrement operator is used. It will not decrease the value of 'n' before calling the reverse() function. So, it calls reverse(5) infinitely.

Note: If we use pre-decrement operator like reverse(--n), then the output will be 5, 4, 3, 2, 1. Because before calling the function, it decrements the value of 'n'.

What will be the output of the program?

• 12, 12

• 7, 7

• 7, 12

• 12, 7

Answer explanation

Step 1: int i=3, j=4, k, l; The variables i, j, k, l are declared as an integer type and variable i, j are initialized to 3, 4 respectively.

The function addmult(i, j); accept 2 integer parameters.

Step 2: k = addmult(i, j); becomes k = addmult(3, 4)

In the function addmult(). The variable kk, ll are declared as an integer type int kk, ll;

kk = ii + jj; becomes kk = 3 + 4 Now the kk value is '7'.

ll = ii jj; becomes ll = 3 4 Now the ll value is '12'.

return (kk, ll); It returns the value of variable ll only.

The value 12 is stored in variable 'k'.

Step 3: l = addmult(i, j); becomes l = addmult(3, 4)

kk = ii + jj; becomes kk = 3 + 4 Now the kk value is '7'.

ll = ii jj; becomes ll = 3 4 Now the ll value is '12'.

return (kk, ll); It returns the value of variable ll only.

The value 12 is stored in variable 'l'.

Step 4: printf("%d, %d\n", k, l); It prints the value of k and l

Hence the output is "12, 12".

If a function contains two return statements successively, the compiler will generate warnings. Yes/No ?

• Maybe
• No
• Sometimes
• Yes

Answer explanation

Yes. If a function contains two return statements successively, the compiler will generate "Unreachable code" warnings.

What does the following declaration mean?
int (*ptr)[10];

• ptr is array of pointers to 10 integers

• ptr is a pointer to an array of 10 integers

• ptr is an array of 10 integers

• ptr is an pointer to array