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.

401.

Every C program will contain at least one preprocessor directive.

A. True
B. False
Answer» C.
Discussion
402.

Preprocessor directive #ifdef .. #else ... #endif is used for conditional compilation.

A. True
B. False
Answer» B. False
Discussion
403.

What will be the output of the program (sample.c) given below if it is executed from the command line? cmd> sample Jan Feb Mar /* sample.c */ #include<stdio.h> #include<dos.h> int main(int arc, char *arv[]) { int i; for(i=1; i<_argc; i++) printf("%s ", _argv[i]); return 0; }

A. No output
B. sample Jan Feb Mar
C. Jan Feb Mar
D. Error
Answer» D. Error
Discussion
404.

Macros with arguments are allowed

A. True
B. False
Answer» B. False
Discussion
405.

Which of the following statements correctly assigns 12 to month using pointer variable pdt? #include<stdio.h> struct date { int day; int month; int year; }; int main() { struct date d; struct date *pdt; pdt = &d; return 0; }

A. pdt.month = 12
B. &pdt.month = 12
C. d.month = 12
D. pdt->month = 12
Answer» E.
Discussion
406.

A union cannot be nested in a structure

A. True
B. False
Answer» C.
Discussion
407.

Bit fields CANNOT be used in union.

A. True
B. False
Answer» C.
Discussion
408.

one of elements of a structure can be a pointer to the same structure.

A. True
B. False
Answer» B. False
Discussion
409.

A structure can be nested inside another structure.

A. True
B. False
Answer» B. False
Discussion
410.

Point out the error in the program? typedef struct data mystruct; struct data { int x; mystruct *b; };

A. Error: in structure declaration
B. Linker Error
C. No Error
D. None of above
Answer» D. None of above
Discussion
411.

Point out the error in the program? #include<stdio.h> int main() { struct emp { char name[20]; float sal; }; struct emp e[10]; int i; for(i=0; i<=9; i++) scanf("%s %f", e[i].name, &e[i].sal); return 0; }

A. Error: invalid structure member
B. Error: Floating point formats not linked
C. No error
D. None of above
Answer» C. No error
Discussion
412.

What will be the output of the program ? #include<stdio.h> int main() { union a { int i; char ch[2]; }; union a u; u.ch[0]=3; u.ch[1]=2; printf("%d, %d, %d n", u.ch[0], u.ch[1], u.i); return 0; }

A. 3, 2, 515
B. 515, 2, 3
C. 3, 2, 5
D. 515, 515, 4
Answer» B. 515, 2, 3
Discussion
413.

What will be the output of the program ? #include<stdio.h> int main() { struct value { int bit1:1; int bit3:4; int bit4:4; }bit={1, 2, 13}; printf("%d, %d, %d n", bit.bit1, bit.bit3, bit.bit4); return 0; }

A. 1, 2, 13
B. 1, 4, 4
C. -1, 2, -3
D. -1, -2, -13
Answer» D. -1, -2, -13
Discussion
414.

What will be the output of the program ? #include<stdio.h> int main() { enum days {MON=-1, TUE, WED=6, THU, FRI, SAT}; printf("%d, %d, %d, %d, %d, %d n", MON, TUE, WED, THU, FRI, SAT); return 0; }

A. -1, 0, 1, 2, 3, 4
B. -1, 2, 6, 3, 4, 5
C. -1, 0, 6, 2, 3, 4
D. -1, 0, 6, 7, 8, 9
Answer» E.
Discussion
415.

What will be the output of the program in 16 bit platform (Turbo C under DOS) ? #include<stdio.h> int main() { struct value { int bit1:1; int bit3:4; int bit4:4; }bit; printf("%d n", sizeof(bit)); return 0; }

A. 1
B. 2
C. 4
D. 9
Answer» C. 4
Discussion
416.

What will be the output of the program (myprog.c) given below if it is executed from the command line? cmd> myprog one two three /* myprog.c */ #include<stdio.h> int main(int argc, char **argv) { printf("%c n", **++argv); return 0; }

A. myprog one two three
B. myprog one
C. o
D. two
Answer» D. two
Discussion
417.

What will be the output of the program (myprog.c) given below if it is executed from the command line? cmd> myprog one two three /* myprog.c */ #include<stdio.h> #include<stdlib.h> int main(int argc, char **argv) { printf("%s n", *++argv); return 0; }

A. myprog
B. one
C. two
D. three
Answer» C. two
Discussion
418.

What will be the output of the program (sample.c) given below if it is executed from the command line (turbo c under DOS)? cmd> sample Good Morning /* sample.c */ #include<stdio.h> int main(int argc, char *argv[]) { printf("%d %s", argc, argv[1]); return 0; }

A. 3 Good
B. 2 Good
C. Good Morning
D. 3 Morning
Answer» B. 2 Good
Discussion
419.

What will be the output of the program #include<stdio.h> void fun(int); int main(int argc) { printf("%d ", argc); fun(argc); return 0; } void fun(int i) { if(i!=4) main(++i); }

A. 1 2 3
B. 1 2 3 4
C. 2 3 4
D. 1
Answer» C. 2 3 4
Discussion
420.

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

A. Alice
B. ecilA
C. Alice lice ice ce e
D. lice ice ce e
Answer» E.
Discussion
421.

Macro calls and function calls work exactly similarly.

A. True
B. False
Answer» C.
Discussion
422.

Every time we supply new set of values to the program at command prompt, we need to recompile the program.

A. True
B. False
Answer» C.
Discussion
423.

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

A. 10, 2, 4
B. 20, 4, 4
C. 16, 2, 2
D. 20, 2, 2
Answer» C. 16, 2, 2
Discussion
424.

What will be the output of the program? #include<stdio.h> #define SWAP(a, b) int t; t=a, a=b, b=t; int main() { int a=10, b=12; SWAP(a, b); printf("a = %d, b = %d n", a, b); return 0; }

A. a = 10, b = 12
B. a = 12, b = 10
C. Error: Declaration not allowed in macro
D. Error: Undefined symbol 't'
Answer» C. Error: Declaration not allowed in macro
Discussion
425.

What will be the output of the program? #include<stdio.h> #define PRINT(int) printf("int=%d, ", int); int main() { int x=2, y=3, z=4; PRINT(x); PRINT(y); PRINT(z); return 0; }

A. int=2, int=3, int=4
B. int=2, int=2, int=2
C. int=3, int=3, int=3
D. int=4, int=4, int=4
Answer» B. int=2, int=2, int=2
Discussion
426.

What will be the output of the program? #include<stdio.h> #define FUN(i, j) i##j int main() { int va1=10; int va12=20; printf("%d n", FUN(va1, 2)); return 0; }

A. 10
B. 20
C. 1020
D. 12
Answer» C. 1020
Discussion
427.

What will be the output of the program? #include<stdio.h> #define MAX(a, b) (a > b ? a : b) int main() { int x; x = MAX(3+2, 2+7); printf("%d n", x); return 0; }

A. 8
B. 9
C. 6
D. 5
Answer» C. 6
Discussion
428.

What will be the output of the program ? #include<stdio.h> int main() { char str1[] = "India"; char str2[] = "BIX"; char *s1 = str1, *s2=str2; while(*s1++ = *s2++) printf("%s", str1); printf(" n"); return 0; }

A. IndiaBIX
B. BndiaBIdiaBIXia
C. India
D. (null)
Answer» C. India
Discussion
429.

What will be the output of the program assuming that the array begins at location 1002? #include<stdio.h> int main() { int a[2][3][4] = { {1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 1, 2}, {2, 1, 4, 7, 6, 7, 8, 9, 0, 0, 0, 0} }; printf("%u, %u, %u, %d n", a, *a, **a, ***a); return 0; }

A. 1002, 2004, 4008, 2
B. 2004, 4008, 8016, 1
C. 1002, 1002, 1002, 1
D. Error
Answer» D. Error
Discussion
430.

What will be the output of the program ? #include<stdio.h> int main() { char str[] = "peace"; char *s = str; printf("%s n", s++ +3); return 0; }

A. peace
B. eace
C. ace
D. ce
Answer» E.
Discussion
431.

What will be the output of the program ? #include<stdio.h> power(int**); int main() { int a=5, *aa; /* Address of 'a' is 1000 */ aa = &a; a = power(&aa); printf("%d n", a); return 0; } power(int **ptr) { int b; b = **ptr***ptr; return (b); }

A. 5
B. 25
C. 125
D. Garbage value
Answer» C. 125
Discussion
432.

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

A. Error: in printf
B. Nothing will print
C. print "X" of IndiaBIX
D. print "7"
Answer» D. print "7"
Discussion
433.

What will be the output of the program ? #include<stdio.h> int *check(static int, static int); int main() { int *c; c = check(10, 20); printf("%d n", c); return 0; } int *check(static int i, static int j) { int *p, *q; p = &i; q = &j; if(i >= 45) return (p); else return (q); }

A. 10
B. 20
C. Error: Non portable pointer conversion
D. Error: cannot use static for function parameters
Answer» E.
Discussion
434.

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

A. Error
B. No output
C. K
D. %s
Answer» D. %s
Discussion
435.

Will the following program print the message infinite number of times? #include<stdio.h> #define INFINITELOOP while(1) int main() { INFINITELOOP printf("IndiaBIX"); return 0; }

A. Yes
B. No
Answer» B. No
Discussion
436.

Will it result in to an error if a header file is included twice?

A. Yes
B. No
C. It is compiler dependent.
Answer» D.
Discussion
437.

What will be the output of the program? #include<stdio.h> int main() { int arr[3] = {2, 3, 4}; char *p; p = arr; p = (char*)((int*)(p)); printf("%d, ", *p); p = (int*)(p+1); printf("%d", *p); return 0; }

A. 2, 3
B. 2, 0
C. 2, Garbage value
D. 0, 0
Answer» C. 2, Garbage value
Discussion
438.

What will be the output of the program if the size of pointer is 4-bytes? #include<stdio.h> int main() { printf("%d, %d n", sizeof(NULL), sizeof("")); return 0; }

A. 2, 1
B. 2, 2
C. 4, 1
D. 4, 2
Answer» D. 4, 2
Discussion
439.

What will be the output of the program ? #include<stdio.h> int main() { char *p; p="hello"; printf("%s n", *&amp*&p); return 0; }

A. llo
B. hello
C. ello
D. h
Answer» C. ello
Discussion
440.

What will be the output of the program? #include<stdio.h> int main() { int arr[2][2][2] = {10, 2, 3, 4, 5, 6, 7, 8}; int *p, *q; p = &arr[1][1][1]; q = (int*) arr; printf("%d, %d n", *p, *q); return 0; }

A. 8, 10
B. 10, 2
C. 8, 1
D. Garbage values
Answer» B. 10, 2
Discussion
441.

What will be the output of the program assuming that the array begins at the location 1002 and size of an integer is 4 bytes? #include<stdio.h> int main() { int a[3][4] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }; printf("%u, %u, %u n", a[0]+1, *(a[0]+1), *(*(a+0)+1)); return 0; }

A. 448, 4, 4
B. 520, 2, 2
C. 1006, 2, 2
D. Error
Answer» D. Error
Discussion
442.

Even if integer/float arguments are supplied at command prompt they are treated as strings.

A. True
B. False
Answer» B. False
Discussion
443.

The first argument to be supplied at command-line must always be count of total arguments.

A. True
B. False
Answer» C.
Discussion
444.

Which of the following is TRUE about argv?

A. It is an array of character pointers
B. It is a pointer to an array of character pointers
C. It is an array of strings
D. None of above
Answer» B. It is a pointer to an array of character pointers
Discussion
445.

What will be the output of the program? #include<stdio.h> #define CUBE(x) (x*x*x) int main() { int a, b=3; a = CUBE(b++); printf("%d, %d n", a, b); return 0; }

A. 9, 4
B. 27, 4
C. 27, 6
D. Error
Answer» D. Error
Discussion
446.

Point out the error in the program #include<stdio.h> #define SI(p, n, r) float si; si=p*n*r/100; int main() { float p=2500, r=3.5; int n=3; SI(p, n, r); SI(1500, 2, 2.5); return 0; }

A. 26250.00 7500.00
B. Nothing will print
C. Error: Multiple declaration of
D. <i class="C-code">si</i>
E. Garbage values
Answer» D. <i class="C-code">si</i>
Discussion
447.

What will be the output of the program? #include&lt;stdio.h&gt; #define MAN(x, y) ((x)&gt;(y)) ? (x):(y); int main() { int i=10, j=5, k=0; k = MAN(++i, j++); printf("%d, %d, %d n", i, j, k); return 0; }

A. 12, 6, 12
B. 11, 5, 11
C. 11, 5, Garbage
D. 12, 6, Garbage
Answer» B. 11, 5, 11
Discussion
448.

What will be the output of the program? #include&lt;stdio.h&gt; #define SQR(x)(x*x) int main() { int a, b=3; a = SQR(b+2); printf("%d n", a); return 0; }

A. 25
B. 11
C. Error
D. Garbage value
Answer» C. Error
Discussion
449.

What will be the output of the program? #include&lt;stdio.h&gt; #define JOIN(s1, s2) printf("%s=%s %s=%s n", #s1, s1, #s2, s2); int main() { char *str1="India"; char *str2="BIX"; JOIN(str1, str2); return 0; }

A. str1=IndiaBIX str2=BIX
B. str1=India str2=BIX
C. str1=India str2=IndiaBIX
D. Error: in macro substitution
Answer» C. str1=India str2=IndiaBIX
Discussion
450.

A text stream is an ordered sequence of characters composed into lines, each line consisting of zero or more characters plus a terminating new-line character.

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