C Programming Questions and Answers – Formatted Input – 1

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This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Formatted Input – 1”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

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1. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     int main()
  3.     {
  4.         int n;
  5.         scanf("%d", n);
  6.         printf("%d\n", n);
  7.         return 0;
  8.     }

a) Compilation error
b) Undefined behavior
c) Whatever user types
d) Depends on the standard
View Answer

Answer: b
Explanation: None.
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2. What will be the output of the following C code?

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  1.     #include <stdio.h>
  2.     int main()
  3.     {
  4.         char *n;
  5.         scanf("%s", n);
  6.         return 0;
  7.     }

a) Compilation error
b) Undefined behavior
c) Nothing
d) None of the mentioned
View Answer

Answer: b
Explanation: None.
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3. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     int main()
  3.     {
  4.         char n[] = "hello\nworld!";
  5.         char s[13];
  6.         sscanf(n, "%s", s);
  7.         printf("%s\n", s);
  8.         return 0;
  9.     }

a) hellonworld!
b)

hello
world!
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c) hello
d) hello world!
View Answer

Answer: c
Explanation: The array n contains a string which has a newline character in between the strings “hello” and “world”. A newline character is considered as a whitespace character for inputs for the scanf(), sscanf() and fscanf() functions. So, the sscanf() function will only copy upto the string “hello” into the array s. Hence, the output of the printf() function be only the string “hello”.

4. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     int main()
  3.     {
  4.         short int i;
  5.         scanf("%hd", &i);
  6.         printf("%hd", i);
  7.         return 0;
  8.     }

a) Compilation error
b) Undefined behavior
c) Whatever user types
d) None of the mentioned
View Answer

Answer: c
Explanation: None.

5. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     int main()
  3.     {
  4.         short int i;
  5.         scanf("%*d", &i);
  6.         printf("%hd", i);
  7.         return 0;
  8.     }

a) Compilation error
b) Somegarbage value
c) Whatever user types
d) Depends on the standard
View Answer

Answer: b
Explanation: None.

6. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     int main()
  3.     {
  4.         short int i;
  5.         scanf("%*hd", &i);
  6.         printf("%hd", i);
  7.         return 0;
  8.     }

a) Compilation error
b) Somegarbage value
c) Whatever user types
d) Depends on the standard
View Answer

Answer: b
Explanation: None.

7. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     int main()
  3.     {
  4.         short int i;
  5.         scanf("%h*d", &i);
  6.         printf("%hd", i);
  7.         return 0;
  8.     }

a) Compilation error
b) Undefined behavior
c) Somegarbage value
d) Depends on the standard.
View Answer

Answer: a
Explanation: None.

8. Which of the following is NOT a delimiter for an input in scanf?
a) Enter
b) Space
c) Tab
d) None of the mentioned
View Answer

Answer: d
Explanation: None.

9. If the conversion characters of int d, i, o, u and x are preceded by h, it indicates?
a) A pointer to int
b) A pointer to short
c) A pointer to long
d) A pointer to char
View Answer

Answer: b
Explanation: None.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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