Explore topic-wise MCQs in Engineering.

This section includes 564 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.

351.

What will be the output of the program? #include<stdio.h> int main() { int x = 3; float y = 3.0; if(x == y) printf("x and y are equal"); else printf("x and y are not equal"); return 0; }

A. x and y are equal
B. x and y are not equal
C. Unpredictable
D. No output
Answer» B. x and y are not equal
Discussion
352.

What will be the output of the program ? #include<stdio.h> #include<string.h> int main() { static char s[] = "Hello!"; printf("%d n", *(s+strlen(s))); return 0; }

A. 8
B. 0
C. 16
D. Error
Answer» C. 16
Discussion
353.

What will be the output of the program ? #include<stdio.h> int main() { static char s[25] = "The cocaine man"; int i=0; char ch; ch = s[++i]; printf("%c", ch); ch = s[i++]; printf("%c", ch); ch = i++[s]; printf("%c", ch); ch = ++i[s]; printf("%c", ch); return 0; }

A. hhe!
B. he c
C. The c
D. Hhec
Answer» B. he c
Discussion
354.

What will be the output of the program in 16-bit platform (Turbo C under DOS) ? #include<stdio.h> int main() { printf("%d, %d, %d", sizeof(3.0f), sizeof('3'), sizeof(3.0)); return 0; }

A. 8, 1, 4
B. 4, 2, 8
C. 4, 2, 4
D. 10, 3, 4
Answer» C. 4, 2, 4
Discussion
355.

What will be the output of the program ? #include<stdio.h> 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; }

A. The string is empty
B. The string is not empty
C. No output
D. 0
Answer» C. No output
Discussion
356.

What will be the output of the program If characters 'a', 'b' and 'c' enter are supplied as input? #include<stdio.h> int main() { void fun(); fun(); printf(" n"); return 0; } void fun() { char c; if((c = getchar())!= ' n') fun(); printf("%c", c); }

A. abc abc
B. bca
C. Infinite loop
D. cba
Answer» E.
Discussion
357.

What will be the output of the program ? #include<stdio.h> int main() { printf("India", "BIX n"); return 0; }

A. Error
B. India BIX
C. India
D. BIX
Answer» D. BIX
Discussion
358.

What will be the output of the program ? #include<stdio.h> int main() { char *names[] = { "Suresh", "Siva", "Sona", "Baiju", "Ritu"}; int i; char *t; t = names[3]; names[3] = names[4]; names[4] = t; for(i=0; i<=4; i++) printf("%s,", names[i]); return 0; }

A. Suresh, Siva, Sona, Baiju, Ritu
B. Suresh, Siva, Sona, Ritu, Baiju
C. Suresh, Siva, Baiju, Sona, Ritu
D. Suresh, Siva, Ritu, Sona, Baiju
Answer» C. Suresh, Siva, Baiju, Sona, Ritu
Discussion
359.

What will be the output of the program ? #include<stdio.h> #include<string.h> int main() { char str[] = "India 0 BIX 0"; printf("%d n", strlen(str)); return 0; }

A. 10
B. 6
C. 5
D. 11
Answer» D. 11
Discussion
360.

What will be the output of the program ? #include<stdio.h> int main() { char str[7] = "IndiaBIX"; printf("%s n", str); return 0; }

A. Error
B. IndiaBIX
C. Cannot predict
D. None of above
Answer» D. None of above
Discussion
361.

Will the expression *p = p be disallowed by the compiler?

A. Yes
B. No
Answer» C.
Discussion
362.

Every operator has an Associativity

A. Yes
B. No
Answer» B. No
Discussion
363.

The expression of the right hand side of || operators doesn't get evaluated if the left hand side determines the outcome.

A. True
B. False
Answer» B. False
Discussion
364.

Two different operators would always have different Associativity.

A. Yes
B. No
Answer» C.
Discussion
365.

If char=1, int=4, and float=4 bytes size, What will be the output of the program ? #include<stdio.h> int main() { char ch = 'A'; printf("%d, %d, %d", sizeof(ch), sizeof('A'), sizeof(3.14f)); return 0; }

A. 1, 2, 4
B. 1, 4, 4
C. 2, 2, 4
D. 2, 4, 8
Answer» C. 2, 2, 4
Discussion
366.

What will be the output of the program ? #include<stdio.h> int main() { char str[] = "India 0BIX 0"; printf("%d n", sizeof(str)); return 0; }

A. 10
B. 6
C. 5
D. 11
Answer» E.
Discussion
367.

What will be the output of the program ? #include<stdio.h> int main() { static char mess[6][30] = {"Don't walk in front of me...", "I may not follow;", "Don't walk behind me...", "Just walk beside me...", "And be my friend." }; printf("%c, %c n", *(mess[2]+9), *(*(mess+2)+9)); return 0; }

A. t, t
B. k, k
C. n, k
D. m, f
Answer» C. n, k
Discussion
368.

In the expression a=b=5 the order of Assignment is NOT decided by Associativity of operators

A. True
B. False
Answer» C.
Discussion
369.

Associativity of an operator is either Left to Right or Right to Left.

A. True
B. False
Answer» B. False
Discussion
370.

Bitwise & can be used to check if a bit in number is set or not.

A. True
B. False
Answer» B. False
Discussion
371.

If the following structure is written to a file using fwrite(), can fread() read it back successfully? struct emp { char *n; int age; }; struct emp e={"IndiaBIX", 15}; FILE *fp; fwrite(&e, sizeof(e), 1, fp);

A. Yes
B. No
Answer» C.
Discussion
372.

size of union is size of the longest element in the union

A. Yes
B. No
Answer» B. No
Discussion
373.

The elements of union are always accessed using & operator

A. Yes
B. No
Answer» C.
Discussion
374.

Which of the following statements are correct about the program below? #include<stdio.h> int main() { char str[20], *s; printf("Enter a string n"); scanf("%s", str); s=str; while(*s != ' 0') { if(*s >= 97 && *s &lt= 122) *s = *s-32; s++; } printf("%s",str); return 0; }

A. The code converts a string in to an integer
B. The code converts lower case character to upper case
C. The code converts upper case character to lower case
D. Error in code
Answer» C. The code converts upper case character to lower case
Discussion
375.

Which of the following statements are correct about the below declarations? char *p = "Sanjay";char a[] = "Sanjay"; 1: There is no difference in the declarations and both serve the same purpose. 2: p is a non-const pointer pointing to a non-const string, whereas a is a const pointer pointing to a non-const pointer. 3: The pointer p can be modified to point to another string, whereas the individual characters within array a can be changed. 4: In both cases the ' 0' will be added at the end of the string "Sanjay".

A. 1, 2
B. 2, 3, 4
C. 3, 4
D. 2, 3
Answer» C. 3, 4
Discussion
376.

Which of the following statements are correct ? 1: A string is a collection of characters terminated by ' 0'. 2: The format specifier %s is used to print a string. 3: The length of the string can be obtained by strlen(). 4: The pointer CANNOT work on string.

A. 1, 2
B. 1, 2, 3
C. 2, 4
D. 3, 4
Answer» C. 2, 4
Discussion
377.

What will be the output of the program ? #include<stdio.h> #include<string.h> int main() { printf("%d n", strlen("123456")); return 0; }

A. 6
B. 12
C. 7
D. 2
Answer» B. 12
Discussion
378.

Union elements can be of different sizes.

A. True
B. False
Answer» B. False
Discussion
379.

A structure can contain similar or dissimilar elements

A. True
B. False
Answer» B. False
Discussion
380.

The '->' operator can be used to access structures elements using a pointer to a structure variable only

A. True
B. False
Answer» B. False
Discussion
381.

What will be the output of the program ? #include<stdio.h> int main() { printf(5+"Good Morning n"); return 0; }

A. Good Morning
B. Good
C. M
D. Morning
Answer» E.
Discussion
382.

Point out the error in the program? #include<stdio.h> int main() { struct bits { float f:2; }bit; printf("%d n", sizeof(bit)); return 0; }

A. 4
B. 2
C. Error: cannot set bit field for
D. <i class="C-code">float</i>
E. Error: Invalid member access in structure
Answer» D. <i class="C-code">float</i>
Discussion
383.

Point out the error in the program? #include&lt;stdio.h&gt; int main() { struct emp { char name[25]; int age; float bs; }; struct emp e; e.name = "Suresh"; e.age = 25; printf("%s %d n", e.name, e.age); return 0; }

A. Error: Lvalue required/incompatible types in assignment
B. Error: invalid constant expression
C. Error: Rvalue required
D. No error, Output: Suresh 25
Answer» B. Error: invalid constant expression
Discussion
384.

Point out the error in the program in 16-bit platform? #include&lt;stdio.h&gt; int main() { struct bits { int i:40; }bit; printf("%d n", sizeof(bit)); return 0; }

A. 4
B. 2
C. Error: Bit field too large
D. Error: Invalid member access in structure
Answer» D. Error: Invalid member access in structure
Discussion
385.

What will be the output of the program (sample.c) given below if it is executed from the command line? cmd&gt; sample friday tuesday sunday /* sample.c */ #include&lt;stdio.h&gt; int main(int argc, char *argv[]) { printf("%c", **++argv); return 0; }

A. s
B. f
C. sample
D. friday
Answer» C. sample
Discussion
386.

The preprocessor can trap simple errors like missing declarations, nested comments or mismatch of braces.

A. True
B. False
Answer» C.
Discussion
387.

What will be the output of the program if it is executed like below? cmd&gt; sample /* sample.c */ #include&lt;stdio.h&gt; int main(int argc, char **argv) { printf("%s n", argv[argc-1]); return 0; }

A. 0
B. sample
C. samp
D. No output
Answer» C. samp
Discussion
388.

What will be the output of the program (sample.c) given below if it is executed from the command line? cmd&gt; sample one two three /* sample.c */ #include&lt;stdio.h&gt; int main(int argc, char *argv[]) { int i=0; i+=strlen(argv[1]); while(i&gt;0) { printf("%c", argv[1][--i]); } return 0; }

A. three two one
B. owt
C. eno
D. eerht
Answer» D. eerht
Discussion
389.

What will be the output of the program (sample.c) given below if it is executed from the command line? cmd&gt; sample 1 2 3 cmd&gt; sample 2 2 3 cmd&gt; sample 3 2 3 /* sample.c */ #include&lt;stdio.h&gt; int main(int argc, char *argv[]) { printf("%s n", argv[0]); return 0; }

A. sample 3 2 3
B. sample 1 2 3
C. sample
D. Error
Answer» D. Error
Discussion
390.

A preprocessor directive is a message from compiler to a linker.

A. True
B. False
Answer» C.
Discussion
391.

Once preprocessing is over and the program is sent for the compilation the macros are removed from the expanded source code.

A. True
B. False
Answer» B. False
Discussion
392.

What will be the output of the program (myprog.c) given below if it is executed from the command line? cmd&gt; myprog 1 2 3 /* myprog.c */ #include&lt;stdio.h&gt; #include&lt;stdlib.h&gt; int main(int argc, char **argv) { int i, j=0; for(i=0; i&lt;argc; i++) j = j+atoi(argv[i]); printf("%d n", j); return 0; }

A. 123
B. 6
C. Error
D. "123"
Answer» C. Error
Discussion
393.

What will be the output of the program (sample.c) given below if it is executed from the command line? cmd&gt; sample friday tuesday sunday /* sample.c */ #include&lt;stdio.h&gt; int main(int sizeofargv, char *argv[]) { while(sizeofargv) printf("%s", argv[--sizeofargv]); return 0; }

A. sample friday tuesday sunday
B. sample friday tuesday
C. sunday tuesday friday sample
D. sunday tuesday friday
Answer» D. sunday tuesday friday
Discussion
394.

What will be the output of the program (sample.c) given below if it is executed from the command line? cmd&gt; sample friday tuesday sunday /* sample.c */ #include&lt;stdio.h&gt; int main(int argc, char *argv[]) { printf("%c", *++argv[2] ); return 0; }

A. s
B. f
C. u
D. r
Answer» D. r
Discussion
395.

What will be the output of the program (myprog.c) given below if it is executed from the command line? cmd&gt; myprog 10 20 30 /* myprog.c */ #include&lt;stdio.h&gt; int main(int argc, char **argv) { int i; for(i=0; i&lt;argc; i++) printf("%s n", argv[i]); return 0; }

A. 10 20 30
B. myprog 10 20
C. myprog 10 20 30
D. 10 20
Answer» D. 10 20
Discussion
396.

What will be the output of the program (sample.c) given below if it is executed from the command line? cmd&gt; sample "*.c" /* sample.c */ #include&lt;stdio.h&gt; int main(int argc, int *argv) { int i; for(i=1; i&lt;argc; i++) printf("%s n", argv[i]); return 0; }

A. *.c
B. "*.c"
C. sample *.c
D. List of all files and folders in the current directory
Answer» B. "*.c"
Discussion
397.

What will be the output of the program (sample.c) given below if it is executed from the command line? cmd&gt; sample monday tuesday wednesday thursday /* sample.c */ #include&lt;stdio.h&gt; int main(int argc, char *argv[]) { while(--argc&gt;0) printf("%s", *++argv); return 0; }

A. sample monday tuesday wednesday thursday
B. monday tuesday wednesday thursday
C. monday tuesday thursday
D. tuesday
Answer» C. monday tuesday thursday
Discussion
398.

If the following program (myproc.c) is present in the directory "C: TC" then what will be output of the program if run it from DOS shell? /* myproc.c */ #include&lt;stdio.h&gt; int main(int argc, char *argv[]) { printf("%s", argv[0]); return 0; }

A. SAMPLE.C
B. C: TC MYPROC.EXE
C. C: TC
D. Error
Answer» C. C: TC
Discussion
399.

What will be the output of the program in Turbo C? #include&lt;stdio.h&gt; int main(int argc, char *argv, char *env[]) { int i; for(i=1; i&lt;argc; i++) printf("%s n", env[i]); return 0; }

A. List of all environment variables
B. List of all command-line arguments
C. count of command-line arguments
D. Error: cannot have more than two arguments in
E. <i class="C-code">main()</i>
Answer» B. List of all command-line arguments
Discussion
400.

What will be the output of the program (myprog.c) given below if it is executed from the command line? cmd&gt; myprog one two three /* myprog.c */ #include&lt;stdio.h&gt; int main(int argc, char *argv[]) { int i; for(i=1; i&lt;argc; i++) printf("%c", argv[i][0]); return 0; }

A. oot
B. ott
C. nwh
D. eoe
Answer» C. nwh
Discussion