C Programming Questions and Answers – String Operations – 1

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

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

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

  1.     #include <stdio.h>
  2.     #include <string.h>
  3.     int main()
  4.     {
  5.         char *str = "hello, world";
  6.         char *str1 = "hello, world";
  7.         if (strcmp(str, str1))
  8.             printf("equal");
  9.         else
  10.             printf("unequal");
  11.     }

a) equal
b) unequal
c) Compilation error
d) Depends on the compiler
View Answer

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

  1.     #include <stdio.h>
  2.     int main()
  3.     {
  4.         char *str = "hello, world";
  5.         char str1[15] = "hello wo 9";
  6.         strcpy(str, str1);
  7.         printf("%s", str1);
  8.     }

a) Compilation error
b) Segmentation Fault
c) hello, world
d) hello, wo 9
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.     #include <string.h>
  3.     int main()
  4.     {
  5.         char *str = "hello, world";
  6.         char str1[9];
  7.         strncpy(str1, str, 9);
  8.         printf("%s %d", str1, strlen(str1));
  9.     }

a) hello, world 11
b) hello, wor 9
c) Undefined behaviour
d) Compilation error
View Answer

Answer: c
Explanation: None.
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4. What will be the output of the following C code?

  1.     #include <stdio.h>
  2.     int main()
  3.     {
  4.         char *str = "hello, world\n";
  5.         printf("%d", strlen(str));
  6.  
  7.     }

a) Compilation error
b) Undefined behaviour
c) 13
d) 11
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.         char str[11] = "hello";
  5.         char *str1 = "world";
  6.         strcat(str, str1);
  7.         printf("%s %d", str, str[10]);
  8.     }

a) helloworld 0
b) helloworld anyvalue
c) worldhello 0
d) Segmentation fault/code crash
View Answer

Answer: a
Explanation: None.

6. Strcat() function adds null character.
a) Only if there is space
b) Always
c) Depends on the standard
d) Depends on the compiler
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.         char str[10] = "hello";
  5.         char *str1 = "world";
  6.         strncat(str, str1, 9);
  7.         printf("%s", str);
  8.     }

a) helloworld
b) Undefined behaviour
c) helloworl
d) hellowor
View Answer

Answer: a
Explanation: None.

Sanfoundry Global Education & Learning Series – C Programming Language.

To practice all areas of C language, here is complete set of 1000+ Multiple Choice Questions and Answers.

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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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