Copy Of Quiz 2 For Section L

2.

What is the output of this C code? #include <stdio.h> int main() { int x = 0; if (x++) printf("true\n"); else if (x == 1) printf("false\n"); }

True
False
Truefalse
0 time

Correct Answer

A. False

Explanation

The output of this C code is "false". This is because the initial value of x is 0. In the if statement, x is incremented using the post-increment operator, but the value of x before the increment is evaluated in the condition. Since the value of x before the increment is 0, the condition evaluates to false and the corresponding printf statement is executed.

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3.

What is the output of this C code? #include <stdio.h> int main() { int n; for (n = 9; n!=0; n--) printf("n = %d", n--); return 0; }

9 7 5 3 1
9 8 7 6 5 4 3 2 1
Infinite
Error

Correct Answer

A. Infinite

Explanation

The code starts with n = 9 and enters a for loop. In each iteration of the loop, it prints the value of n and then decrements n by 2. However, the decrement operator (--) is used twice in each iteration, once in the printf statement and once in the loop itself. This leads to n being decremented by 2 in each iteration instead of 1. As a result, n will never be equal to 0, causing an infinite loop. Therefore, the output of the code is infinite.

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4.

What is the output of this C code? #include <stdio.h> int main() { int i = 4, j = 7; do { printf("Loop"); }while(++i < --j); return 0; }

Loop
LoopLoop
Prints nothing
Compilation Error

Correct Answer

A. LoopLoop

Explanation

The code uses a do-while loop to repeatedly print "Loop" as long as the condition (++i < --j) is true. Initially, i is incremented to 5 and j is decremented to 6, so the condition is true. "Loop" is printed once. Then, i is incremented to 6 and j is decremented to 5, still making the condition true. "Loop" is printed again. After this, i is incremented to 7 and j is decremented to 4, making the condition false. The loop terminates and the program ends, resulting in the output "LoopLoop".

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5.

How many times is a do while loop guaranteed to loop?

1
0
Infinite
Depend on Variable

Correct Answer

A. 1

Explanation

A do while loop is guaranteed to loop at least once because the condition is checked at the end of the loop. This means that the loop will always execute the code block once before checking if the condition is true or false. Therefore, even if the condition is false from the beginning, the loop will still run once.

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6.

What is the output of this C code? #include <stdio.h> int main() { do printf("In while loop "); while (0); printf("After loop\n"); }

In while loop
In while loop After loop
After loop
For (i = n-1; i>-1; i–)

Correct Answer

A. In while loop After loop

Explanation

The code uses a do-while loop with a condition of 0, which means the loop will execute at least once. Inside the loop, it prints "In while loop ". After the loop, it prints "After loop". Therefore, the output of the code will be "In while loop After loop".

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7.

What is the output of this C code? int main () { int i=0; for (i=0; i<20; i++) { switch (i) { case 0 : i += 5; case 1 : i += 2; case 5 : i += 5; default : i += 4; break; } printf("%d, ", i); } }

0,5,9,13,17
5,9,13,17
12,17,22
16,21

Correct Answer

A. 16,21

Explanation

The code starts with initializing the variable i to 0. Then, it enters a for loop that iterates until i is less than 20. Inside the loop, there is a switch statement that checks the value of i.

When i is 0, it adds 5 to i and continues to the next case. When i is 1, it adds 2 to i and continues to the next case. When i is 5, it adds 5 to i and continues to the next case.

In the default case, it adds 4 to i and then breaks out of the switch statement. Finally, the value of i is printed using printf.

The output of the code is 16,21 because after the loop iterates 16 times, the value of i becomes 16 and then it adds 4 in the default case before printing it.

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8.

What is the output of the given code: #include <stdio.h> void main() { int i = 0; while (++i) { printf("H"); } }

H
Error
H is printed infinite times
None

Correct Answer

A. H is printed infinite times

Explanation

The code contains an infinite loop. The condition in the while loop is "++i", which means that the value of "i" will be incremented by 1 before each iteration of the loop. Since the condition is always true (non-zero), the loop will continue indefinitely. Inside the loop, the code prints "H" repeatedly, resulting in "H" being printed infinite times.

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9.

What is the output of this C code? #include int main() { int x = 1; if (x > 0) printf("inside if\n"); else if (x > 0) printf("inside elseif\n"); }

Inside if
Inside elseif
Inside if inside elseif
Syntax error

Correct Answer

A. Inside if

Explanation

The output of this C code is "inside if". This is because the variable x is equal to 1, which is greater than 0. Therefore, the condition in the if statement is true and the code inside the if block is executed. The else if statement is not evaluated because the condition x > 0 is already satisfied.

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10.

What is the output of the given code: int main() { int i; int arr[5] = {1}; for (i = 0; i < 5; i++) printf("%d ", arr[i]); return 0; }

1 followed by four garbage values:
10000
11111
00000

Correct Answer

A. 00000

Explanation

The given code initializes an integer array `arr` with size 5 and assigns the first element as 1 while leaving the rest of the elements uninitialized. The code then enters a for loop that iterates 5 times. Each iteration, it prints the value of `arr[i]`, which in this case will be 1 for the first iteration and garbage values for the rest of the iterations since the rest of the elements in the array are uninitialized. Therefore, the output will be "1 followed by four garbage values".

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Copy Of Quiz 2 For Section L

What is the output of this piece of code? #include <stdio.h> void main() { int i; for(i=0;i<10;i++) printf(“%d ”,i); }

Quiz Preview

What is the output of this C code? #include <stdio.h> int main() { int x = 0; if (x++) printf("true\n"); else if (x == 1) printf("false\n"); }

What is the output of this C code? #include <stdio.h> int main() { int n; for (n = 9; n!=0; n--) printf("n = %d", n--); return 0; }

What is the output of this C code? #include <stdio.h> int main() { int i = 4, j = 7; do { printf("Loop"); }while(++i < --j); return 0; }

How many times is a do while loop guaranteed to loop?

What is the output of this C code? #include <stdio.h> int main() { do printf("In while loop "); while (0); printf("After loop\n"); }

What is the output of this C code? int main () { int i=0; for (i=0; i<20; i++) { switch (i) { case 0 : i += 5; case 1 : i += 2; case 5 : i += 5; default : i += 4; break; } printf("%d, ", i); } }

What is the output of the given code: #include <stdio.h> void main() { int i = 0; while (++i) { printf("H"); } }

What is the output of this C code? #include int main() { int x = 1; if (x > 0) printf("inside if\n"); else if (x > 0) printf("inside elseif\n"); }

What is the output of the given code: int main() { int i; int arr[5] = {1}; for (i = 0; i < 5; i++) printf("%d ", arr[i]); return 0; }