Explore topic-wise MCQs in C Programming.

This section includes 37 Mcqs, each offering curated multiple-choice questions to sharpen your C Programming knowledge and support exam preparation. Choose a topic below to get started.

1.

What will be the output of the following C code if following commands are used to run(considering Newfile exists)?
gcc -otest test.c
 ./test < Newfile
 
 #include <stdio.h>
 int main()
 {
 char ch = 'U';
 putchar(ch);
 }
A. U on the screen
B. Undefined behaviour
C. Compilation Error
D. U in the myfile file
E. None of these
Answer» B. Undefined behaviour
Discussion
2.

What will be the output of the following C code if following commands are used to run(considering Newfile exists)?
gcc -otest test.c
 ./test > Newfile
 
 #include <stdio.h>
 int main(int argc, char **argv)
 {
 char ch = 'U';
 putchar(ch);
 printf(" %d n", argc);
 }
A. U in Newfile and 1 in screen
B. U in Newfile and 2 in screen
C. U 1 in Newfile
D. U 2 in Newfile
E. None of these
Answer» D. U 2 in Newfile
Discussion
3.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 short int n;
 scanf("%hd", &n);
 printf("%hd", n);
 return 0;
 }
A. Whatever user types
B. Compilation Error
C. Undefined behavior
D. Runtime Error
E. None of these
Answer» B. Compilation Error
Discussion
4.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 char ch1[] = "HelloInterviewMania!";
 char ch2[13];
 scanf(ch1, "%s", ch2);
 printf("%s n", ch2);
 return 0;
 }
A. HelloInterviewMania
B. Nothing
C. Undefined behaviour
D. Hello
E. Compilation Error
Answer» C. Undefined behaviour
Discussion
5.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 char *num;
 scanf("%s", num);
 return 0;
 }
A. Undefined behaviour
B. Nothing
C. Compilation Error
D. Runtime Error
E. None of these
Answer» C. Compilation Error
Discussion
6.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 int num;
 scanf("%d", num);
 printf("%d n", num);
 return 0;
 }
A. Whatever user types
B. Compilation Error
C. Depends on the standard
D. Undefined behavior
E. None of these
Answer» E. None of these
Discussion
7.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 short int num;
 scanf("%h*d", &num);
 printf("%hd", h);
 return 0;
 }
A. Undefined behavior
B. Compilation Error
C. Runtime Error
D. Somegarbage value
E. None of these
Answer» C. Runtime Error
Discussion
8.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 short int n;
 scanf("%*hd", &n);
 printf("%hd", n);
 return 0;
 }
A. Garbage value
B. Compilation Error
C. Runtime Error
D. Whatever user types
E. None of these
Answer» B. Compilation Error
Discussion
9.

What will be the output of the following C code if 2 character is typed by the user?
#include <stdio.h>
#include <string.h>
 int main()
 {
 char line[25];
 fgets(line, 25, stdin);
 printf("%d n", line[2]);
 return 0;
 }
A. Undefined behaviour
B. 25(ascii value of newline character)
C. Compilation Error
D. 64
E. None of these
Answer» E. None of these
Discussion
10.

What will be the output of the following C code?
#include <stdio.h>
#include <string.h>
 int main()
 {
 char line[25];
 FILE *fp;
 fp = fopen("file.txt", "r");
 while (fgets(line, 25, fp))
 fputs(line, stdout);
 return 0;
 }
A. No.of lines present in file.txt
B. Infinite loop
C. Compilation error
D. Segmentation fault
E. None of these
Answer» E. None of these
Discussion
11.

What will be the output of the following C function when EOF returns?
int fputs(char *line, FILE *fp)
A. t character in array line is encountered
B. character of array line is encountered
C. When an error occurs
D. n character in array line is encountered
E. None of these
Answer» D. n character in array line is encountered
Discussion
12.

What does the following command line signify?
prog1|prog2
A. It runs both the programs, pipes output of prog2 to input of prog1
B. It runs prog1 first, prog2 second
C. It runs prog2 first, prog1 second
D. It runs both the programs, pipes output of prog1 to input of prog2
E. None of these
Answer» E. None of these
Discussion
13.

What will be the output of the following C code?
#include <stdio.h>
 int main(int argc, char** argv)
 {
 char *str = "Interveiw";
 int n = 3;
 printf("%10.*s", n, str);
 }
A. Int(note:6 spaces after Int)
B. Interveiw(note:2 spaces after myworld)
C. Interveiw(note:2 spaces before myworld)
D. Int
E. None of these
Answer» B. Interveiw(note:2 spaces after myworld)
Discussion
14.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 int n = 25, m = 13;
 printf("%d %d %d", n, m);
 }
A. 25 13 Garbage value
B. 25 13
C. Undefined behaviour
D. 13 25
E. None of these
Answer» B. 25 13
Discussion
15.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 int m = 31, n = 13, p = 30;
 printf("%d %d ", m, n, p);
 }
A. Compilation Error
B. Garbage value
C. 31 13 30
D. 13 30
E. 31 13
Answer» F.
Discussion
16.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 char *str = "Interview";
 int n = 30;
 printf("%*s", n, str);
 }
A. Undefined
B. Interview
C. Interview (note:followed by two spaces after Interview)
D. Interview(note: spaces to the left of Interview)
E. None of these
Answer» E. None of these
Discussion
17.

What will be the output of the following C code?
#include 
 int main()
 {
 int n = 15, m = 8;
 printf("%d n", printf("%d %d ", n, m));
 }
A. 15 8 5
B. 15 8
C. Garbage value
D. Compilation Error
E. None of these
Answer» B. 15 8
Discussion
18.

What will be the output of the following C code?
#include <stdio.h>
#include <string.h>
 int main()
 {
 char line[];
 fgets(line, 25, stdin);
 printf("%d n", strlen(line));
 return 0;
 }
A. 25
B. Any length since line did not end with null character
C. Compilation Error
D. Runtime Error
E. None of these
Answer» D. Runtime Error
Discussion
19.

Identify N library function for line input and output in the following C code?
#include <stdio.h>
 int N(char *str, FILE *iop);
 {
 int ch;
 while (ch = *str++)
 putc(ch, iop);
 return ferror(iop) ? EOF : 0;
 }
A. fputs
B. fgets
C. putc
D. getc
E. Compilation Error
Answer» F.
Discussion
20.

What is the meaning of the following C statement?
printf( %10s , state);

A. Print empty spaces if the string state is less than 10 characters
B. Print the last 10 characters of the string
C. 10 spaces before the string state is printed
D. All of above
E. None of these
Answer» B. Print the last 10 characters of the string
Discussion
21.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 short int num;
 scanf("%*d", &num);
 printf("%hd", num);
 return 0;
 }
A. Whatever user types
B. Runtime Error
C. Garbage value
D. Compilation Error
E. None of these
Answer» D. Compilation Error
Discussion
22.

What will be the output of the following C code (when 10 and 20 are entered)?
#include <stdio.h>
 void main()
 {
 int n1, n2;
 printf("Enter Numbers: ");
 scanf("%d", &n2);
 scanf("%d", &n1);
 printf("%d t%d n", n2, n1);
 }
A. 10 Garbage value
B. Garbage value 20
C. Compilation Error
D. Undefined behaviour
E. 10 20
Answer» F.
Discussion
23.

What will be the output of the following C code?
#include <stdio.h>
 int main()
 {
 char ch = ' ';
 putchar(ch);
 }
A. Nothing
B. Undefined behaviour
C. 0
D. Compilation Error
E. None of these
Answer» B. Undefined behaviour
Discussion
24.

What will be the output of the following C code if following commands are used to run and if Newfile does not exist?
gcc -o test test.c
 ./test > Newfile
 
 #include <stdio.h>
 int main(int argc, char **argv)
 {
 char ch = 'N';
 putchar(ch);
 printf(" %d n", argc);
 }
A. Depends on the standard
B. Depends on the system
C. N 2 in Newfile
D. N 1 in Newfile
E. None of these
Answer» E. None of these
Discussion
25.

What is the meaning of the following C statement?

A. Print empty spaces if the string state is less than 10 characters
B. Print the last 10 characters of the string
C. 10 spaces before the string state is printed
D. All of above
E. None of these
Answer» B. Print the last 10 characters of the string
Discussion
26.

The syntax to print a % using printf statement can be done by ________.

A. %
B. %%
C. %
D. %
E. None of these
Answer» C. %
Discussion
27.

What will be the output of the following C code (when 10 and 20 are entered)?

A. 10 Garbage value
B. Garbage value 20
C. Compilation Error
D. Undefined behaviour
E. 10 20
Answer» F.
Discussion
28.

Which of the following doesn t require an & for the input in scanf()?

A. float name[15];
B. int name[15];
C. char name[15];
D. All of above
E. None of these
Answer» D. All of above
Discussion
29.

Identify N library function for line input and output in the following C code?

A. fputs
B. fgets
C. putc
D. getc
E. Compilation Error
Answer» F.
Discussion
30.

What will be the output of the following C function when EOF returns?

A. t character in array line is encountered
B. character of array line is encountered
C. When an error occurs
D. n character in array line is encountered
E. None of these
Answer» D. n character in array line is encountered
Discussion
31.

What is the size of array line used in fgets(line, maxline, *fp) function?

A. Size is dynamic
B. maxline + 1
C. maxline
D. maxline 1
E. None of these
Answer» D. maxline 1
Discussion
32.

What will be the output of the following C code if 2 character is typed by the user?

A. Undefined behaviour
B. 25(ascii value of newline character)
C. Compilation Error
D. 64
E. None of these
Answer» E. None of these
Discussion
33.

What will be the output of the following C code if following commands are used to run and if Newfile does not exist?

A. Depends on the standard
B. Depends on the system
C. N 2 in Newfile
D. N 1 in Newfile
E. None of these
Answer» E. None of these
Discussion
34.

What will be the output of the following C code if following commands are used to run(considering Newfile exists)?

A. U on the screen
B. Undefined behaviour
C. Compilation Error
D. U in the myfile file
E. None of these
Answer» B. Undefined behaviour
Discussion
35.

putchar(c) function/macro always outputs character c to the __________.

A. standard output
B. depends on the standard
C. screen
D. depends on the compiler
E. None of these
Answer» B. depends on the standard
Discussion
36.

What does the following command line signify?

A. It runs both the programs, pipes output of prog2 to input of prog1
B. It runs prog1 first, prog2 second
C. It runs prog2 first, prog1 second
D. It runs both the programs, pipes output of prog1 to input of prog2
E. None of these
Answer» E. None of these
Discussion
37.

For a typical program, the input is taken using _________.

A. Files
B. Command-line
C. scanf
D. All of above
E. None of these
Answer» E. None of these
Discussion