Aptitude Test On C-programming (Pointers And Strings) Set -b

15 Questions | Attempts: 103
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  • 1/15 Questions

    If the size of integer is 4bytes, What will be the output of the program? int main() { int arr[] = {12, 13, 14, 15, 16}; printf("%d, %d, %d\n", sizeof(arr), sizeof(*arr), sizeof(arr[0])); return 0; }

    • 10, 2, 4
    • 20, 4, 4
    • 20, 2, 2
    • 16, 2, 2
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  • 2. 

    If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable?

    • '.'

    • '&'

    • '*'

    • '->'

    Correct Answer
    A. '->'
  • 3. 

    What would be the equivalent pointer expression for referring the array element a[i][j][k][l]

    • ((((a+i)+j)+k)+l)

    • *(*(*(*(a+i)+j)+k)+l)

    • (((a+i)+j)+k+l)

    • *((a+i)+j+k+l)

    Correct Answer
    A. *(*(*(*(a+i)+j)+k)+l)
  • 4. 

    Are the expression *ptr++ and ++*ptr are same?

    • True

    • False

    Correct Answer
    A. False
    Explanation
    *ptr++ increments the pointer and not the value,
    ++*ptr increments the value being pointed by ptr .

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  • 5. 

    What will be the output of the program ?   int main() {     int i=3, *j, k;     j = &i;     printf("%d\n", i**j*i+*j);     return 0; }

    • 30

    • 27

    • 9

    • 3

    Correct Answer
    A. 30
    Explanation
    j=&i implies *j=i;
    *j=3
    i**j=3*3=9
    i**j*i=9*3=27
    i**j*i+*j=27+3=30

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  • 6. 

    What will be the output of the program ? int main() {     printf(5+"Good Morning\n");   return 0; }

    • Morning

    • Good Morning

    • Good

    • M

    Correct Answer
    A. Morning
    Explanation
    printf(5+"Good Morning\n"); It skips the 5 characters and prints the given string.
    Hence the output is "Morning"

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  • 7. 

    What will be the output of the program ? int main() {     char str[] = "India\0\is Best\0";     printf("%d\n", strlen(str));     return 0; }

    • 5

    • 10

    • 11

    • 6

    Correct Answer
    A. 5
    Explanation
    The function strlen returns the number of characters in the given string.
    Therefore, strlen(str) becomes strlen("India") contains 5 characters. A string is a collection of characters terminated by '\0'.
    The output of the program is "5"

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  • 8. 

    Trace the output. int main() {     char str[] = "basic";     char *s = str;     printf("%s ", s++ +3);     printf("%s",s);     return 0; }

    • C basic

    • C c

    • Ic asic

    • Asic sic

    Correct Answer
    A. Ic asic
    Explanation
    printf("%s ", s++ +3); -> ic since (s++ +3) and s++ is post increment but +3 just print string from 'i'. It ll not increment the pointer to 3.
    printf("%s",s); here after incrementing (s++) It ll print ''asic''.

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  • 9. 

    What will be the output of the program ? int main() { char *str; str = "%s"; printf(str, "K\n"); return 0; }

    • %s

    • Error

    • K

    • No Output

    Correct Answer
    A. K
    Explanation
    printf(str, "K\n"); is replaced with printf("%s" , "K\n");
    (since str = "%s";)

    So it will print K.

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  • 10. 

    What will be the output of the program ?   int main() {     int i;     char a[] = "\0";     if(printf("%s", a))         printf("The string is empty\n");     else         printf("The string is not empty\n");     return 0; }

    • No Output

    • The string is empty

    • The string is not empty

    • 0

    Correct Answer
    A. The string is not empty
    Explanation
    The function printf() returns the number of characters printed on the console.
    char a[] = "\0"; The variable a is declared as an array of characters and it initialized with "\0". It denotes that the string is empty.
    if(printf("%s", a)) The printf() statement does not print anything, so it returns '0'(zero). Hence the if condition is failed.
    In the else part it prints "The string is not empty".

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  • 11. 

    Which of the following function is used to find the first occurrence of a given string in another string?

    • Strnset()

    • Strchr()

    • Strrchr()

    • Strstr()

    Correct Answer
    A. Strstr()
  • 12. 

    What will be the output of the program ?   int main() {     char p[] = "%d\n";     p[1] = 'c';     printf(p, 65);     return 0; }

    • A

    • C

    • A

    • 65

    Correct Answer
    A. A
    Explanation
    char p[] = "%d\n"; The variable p is declared as an array of characters and initialized with string "%d".
    p[1] = 'c'; Here, we overwrite the second element of array p by 'c'. So array p becomes "%c".
    printf(p, 65); becomes printf("%c", 65);
    Therefore it prints the ASCII value of 65. The output is 'A'.

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  • 13. 

    What will be the output of the program ? int main() {     char str1[] = "Hello";     char str2[] = "Hello";     if(str1 == str2)         printf("Equal\n");     else         printf("Unequal\n");     return 0; }

    • Unequal

    • Equal

    • Error

    • None of above

    Correct Answer
    A. Unequal
    Explanation
    if(str1 == str2) here the address of str1 and str2 are compared. The addresses of both variables are not same. Hence the if condition is failed.
    At the else part it prints "Unequal".

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  • 14. 

    What will be the output of the program ?   int main() {     void*vp;     char ch=74, *cp="JACK";     int j=65;     vp=&ch;     printf("%c", *(char*)vp);     vp=&j;     printf("%c", *(int*)vp);     vp=cp;     printf("%s", (char*)vp+2);     return 0; }

    • JCK

    • J65K

    • JACK

    • JAK

    Correct Answer
    A. JACK
    Explanation
    Pointer always store integer value so cp will store the memory address of location where string "jack " is stored.

    vp = &ch; Will store address of ch in vp so while we print content in printf it will print asccii value of 74 i.e "J"

    vp = &j; It will assign address of j to vp again it will print ascii value of 65 as "A"

    vp = cp; In this step cp is pointing to memory locatioon where string jack is stored and we r incrementing it by two so it will point to "C"
    from sring "JACK" and since we hava given %S in printf so it will print content from c onward ie "CK"

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  • 15. 

    What will be the output of the program ?   int main() {     int i, a[] = {2, 4, 6, 8, 10};     change(a, 5);     for(i=0; i<=4; i++)         printf("%d, ", a[i]);     return 0; } change(int *b, int n) {     int i;    for(i=0; i<n; i++)      *(b+1) = *(b+i)+5; }

    • 3, 1, -1, -3, -5

    • 7, 9, 11, 13, 15

    • 2, 15, 6, 8, 10

    • 2, 4, 6, 8, 10

    Correct Answer
    A. 2, 15, 6, 8, 10
    Explanation
    *(b+1) = *(b+i)+5;
    1. i = 0 => *(b+1) ie 4 is replaced by *(b+0)+5 ie 2+5
    2. i = 1 => *(b+1) ie 4 is replaced by *(b+1)+5 ie 4+5
    3. i = 2 => *(b+1) ie 4 is replaced by *(b+2)+5 ie 6+5
    4. i = 3 => *(b+1) ie 4 is replaced by *(b+3)+5 ie 8+5
    5. i = 4 => *(b+1) ie 4 is replaced by *(b+4)+5 ie 10+5

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 25, 2011
    Quiz Created by
    Mayurkothawade
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