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C Programming Language Quiz - 1

Description: C Programming Language Quiz - 1
Number of Questions: 10
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Tags: c
Attempted 0/10 Correct 0 Score 0
c
  1. is correct

  2. has syntax error

  3. causes run-time error

  4. none of the above


Correct Option: B
Explanation:

To understand the answer to this question, the user needs to have knowledge of basic programming concepts, specifically the syntax and rules of the programming language being used. In this case, it appears to be a C programming language snippet.

Now, let's go through each option and explain why it is right or wrong:

A. is correct: This option is incorrect because the statement 16 = m is using the assignment operator (=) in reverse. In C programming, the assignment operator is used to assign a value to a variable, not to compare values. The correct way to compare values in C is to use the equality operator (==). Therefore, the statement should be written as if (16 == m) printf("m is 16");.

B. has syntax error: This option is correct. The given statement 16 = m has a syntax error because it is using the assignment operator (=) in reverse, which is not allowed in C programming. The correct way to compare values in C is to use the equality operator (==). Therefore, the correct syntax should be if (16 == m) printf("m is 16");.

C. causes run-time error: This option is incorrect because the given code does not have a run-time error. It has a syntax error, as mentioned in option B, but it will not cause a run-time error because it will not compile successfully.

D. none of the above: This option is incorrect because option B is correct. The given code has a syntax error and will not compile successfully.

Therefore, the correct answer is:

The Answer is: B. has syntax error

To copy a string into another, given: char s1[30] = "xyz", s2[20];

c
  1. s2 = s1;

  2. strcpy(s2,s1);

  3. s2 == s1;

  4. all three are wrong


Correct Option: B

AI Explanation

To copy a string into another, you can use the strcpy() function from the string.h library in C.

Let's go through each option to understand why it is correct or incorrect:

Option A) s2 = s1; - This option is incorrect because it assigns the memory address of s1 to s2, rather than copying the contents of s1 into s2.

Option B) strcpy(s2, s1); - This option is correct. The strcpy() function is used to copy the contents of one string (s1) into another string (s2). It takes two arguments: the destination string (s2) and the source string (s1).

Option C) s2 == s1; - This option is incorrect. The == operator is used to compare the memory addresses of two variables, not their contents.

Option D) all three are wrong - This option is incorrect because option B is correct.

Therefore, the correct answer is B) strcpy(s2, s1);. This option correctly copies the contents of s1 into s2 using the strcpy() function.

c
  1. Positive number

  2. Even number

  3. Odd number

  4. Prime number


Correct Option: A
c
  1. Infinite loop

  2. Syntax error

  3. Depends on the compiler

  4. none of the above


Correct Option: A
Explanation:

To understand the given statement and determine the correct answer, we need to analyze the syntax and behavior of the code.

The given statement is a while loop with the condition "1". In C and C++ programming languages, any non-zero value is considered true, and the loop will continue executing as long as the condition is true.

Let's go through each option and explain why it is right or wrong:

A. Infinite loop: This option is correct. Since the condition "1" is always true, the loop will continue executing indefinitely, resulting in an infinite loop. The loop will not terminate unless there is a break statement or the program is interrupted externally.

B. Syntax error: This option is incorrect. The given statement does not contain any syntax errors. It is a valid while loop syntax in C and C++.

C. Depends on the compiler: This option is incorrect. The behavior of the given statement does not depend on the compiler. The program will behave in the same way regardless of the compiler being used.

D. none of the above: This option is incorrect. As explained above, the correct answer is A, as the given statement will result in an infinite loop.

The Answer is: A

The highest digit in any number system equals:

c
  1. Zero

  2. Base - 1

  3. Base 1

  4. none of the above


Correct Option: B
Explanation:

To solve this question, the user needs to have knowledge of number systems and the concept of place value.

The highest digit in any number system is determined by the base of that number system. The base represents the number of unique digits used in that system. For example, in the decimal number system (base 10), the unique digits are 0-9. Therefore, the highest digit in the decimal system is 9.

Now, let's go through each option and explain why it is right or wrong:

A. Zero: This option is incorrect. Zero is not considered a digit in any number system. It is used to represent the absence of a value, but it does not have a place value or contribute to the magnitude of a number.

B. Base - 1: This option is correct. The highest digit in any number system is one less than the base of that system. For example, in the binary number system (base 2), the highest digit is 1. In the decimal system (base 10), the highest digit is 9.

C. Base 1: This option is incorrect. Base 1 does not exist as a number system. A number system requires at least two unique digits to represent numbers. Base 1 would only have the digit 1, which is not enough to create a functional number system.

D. None of the above: This option is incorrect. As explained above, the highest digit in any number system is determined by the base of that system. Therefore, option D is not a valid response.

The Answer is: B. Base - 1

The main() function is:

c
  1. to write output to the screen

  2. the program entry point

  3. Both correct

  4. Both wrong


Correct Option: B
c
  1. gets( s[100] );

  2. gets( s[] );

  3. gets( s );

  4. none of the above


Correct Option: C
c
  1. no output

  2. 7

  3. 3

  4. 5


Correct Option: C
Explanation:

To understand the output of this code, the user needs to know basic programming concepts, including variable assignment and the use of the if statement. The user must evaluate the code to determine the value of x and whether the if statement will execute its block of code.

Now, let's go through each option and explain why it is right or wrong:

A. no output: This option is incorrect. The code contains a printf statement, which will output the value of x if the if statement condition is true.

B. 7: This option is incorrect. The value of x is initially assigned the value 7, but this value is overwritten in the if statement condition.

C. 3: This option is correct. The if statement condition x = 3 is an assignment operation. It assigns the value 3 to x and also evaluates to 3. Since the value of x is now 3, the if statement condition is true, and the block of code will execute. The printf statement will output the value of x, which is 3.

D. 5: This option is incorrect. There is no mention of the value 5 in the code. The value assigned to x is 3, not 5.

Therefore, the correct answer is:

The Answer is: C. 3

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