C Programming Multiple Choice Questions and Answers on String Operations for Freshers

1. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         char *str = "hello, world";

5.         char *str1 = "hello, world";

6.         if (strcmp(str, str1))

7.             printf("equal");

8.         else

9.             printf("unequal");

10.     }

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

Answer: b

2. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         char *str = "hello";

5.         char str1[5];

6.         strcpy(str, str1);

7.         printf("%s", str1);

8.     }

a) Compilation error
b) Undefined behaviour
c) hello, world
d) hello, wo 9

Answer: d

3. What is the output of this C code?

1.     #include 

2.     #include 

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

Answer: c

4. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         char *str = "hello, world\n";

5.         printf("%d", strlen(str));

7.     }

a) Compilation error
b) Undefined behaviour
c) 13
d) 11

Answer: c

5. What is the output of this C code?

1.     #include 

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

Answer: a

6. Strcat function adds null character

a) Only if there is space
b) Always
c) Depends on the standard
d) Depends on the compiler

Answer: b

7. What is the output of this C code?

1.     #include 

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

Answer: a

8. The return-type used in String operations are.

a) void only
b) void and (char *) only
c) void and int only
d) void, int and (char *) only

Answer: d

9. String operation such as strcat(s, t), strcmp(s, t), strcpy(s, t) and strlen(s) heavily     rely upon.

a) Presence of NULL character
b) Presence of new-line character
c) Presence of any escape sequence
d) None of the mentioned

Answer: a

10. Which pre-defined function returns a pointer to the last occurence of a character in     a string?

a) strchr(s, c);
b) strrchr(s, c);
c) strlchr(s, c);
d) strfchr(s, c);

Answer: b

11. Which of the following function compares 2 strings with case-insensitively?

a) strcmp(s, t)
b) strcmpcase(s, t)
c) strcasecmp(s, t)
d) strchr(s, t)

Answer: c

12. What will be the value of var for the following?
    var = strcmp(“Hello”, “World”);

a) -1
b) 0
c) 1
d) strcmp has void return-type

Answer: a

13. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         char str[10] = "hello";

5.         char *p = strrchr(str, 'l');

6.         printf("%c\n", *(++p));

7.     }

a) l
b) o
c) e
d) Compilation error

Answer: b