Anand Singh, Author at AlfaTechLab

Q1.Write a code to check whether a number is even or odd

Here you will find an algorithm and program to check whether a number is an even number or an odd number. First let us understand what is even and odd number.

Even Number :- Even numbers are the numbers which are divisible by 2. For Example :- 2, 4, 6, 8…

Odd Number :- Odd numbers are the numbers which are not divisible by 2. For Example :- 1, 3, 5, 7…

Now let us understand what logic we need to use in this –
As we know that, to know number is even or odd we used to check its divisibility with 2, so here we will check the remainder we get on dividing the input number with 2 if we get remainder as 0 then it is divisible by 2 and hence it is even number else it is odd number.

For Example :-

Input : 10
Output : Even Number
Explanation : As we can see that the number given in input, which is 10, on dividing with 2 we get remainder 0 therefore 10 is Even Number.

Algorithm to check number is even or odd

\\Algorithm to check number is even or odd.
START
Step 1: [ Take Input ] Read: Number N
Step 2: Check: If N%2 == 0 Then
Print : N is an Even Number.
Else
Print : N is an Odd Number.
STOP

Program to check whether the number is even or odd

C++

Java

Python

PHP

C++

Java

Python

PHP

Output

The number 10 is Even number

Recommended Programs
Program to find factorial of a number
Program to count number of digits in a number

Array & String

Programming Multiple Choice Question -Array & String

This section focuses on the “Array & String” of the C programming. These Multiple Choice Questions (mcq) should be practiced to improve the C programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. How many keywords are there in c ?

A. 31
B. 64
C. 32
D. 63

View Answer

Ans : C
Explanation: It will give compile time error because a is not declared.

2. Which of the following is true for variable names in C?

A. Reserved Word can be used as variable name
B. Variable can be of any length
C. They can contain alphanumeric characters as well as special characters
D. Variable names cannot start with a digit

View Answer

Ans : A
Explanation: Variable names cannot start with a digit in C Programming language.

3. Find out the output of following program? if input a is 3 and b is 4

A. 3
B. 2
C. runtime error
D. compile time error

View Answer

Ans : B
Explanation: In C, scanf returns the number of inputs it has successfully read it means here is two variable 3 and 4 so scanf return 2(successfully read)

4. What is the output of this program?

void main()
{
int x = 10;
float x = 10;
printf(“%d”, x)
}

A. 10,10
B. 10
C. Compilations Error
D. 10.1

View Answer

Ans : C
Explanation: Since the variable x is defined both as integer and as float, it results in an Compilations Error

5.What is the output of this program?

#include <stdio.h>
int main()
{
int i;
i = printf(“alfatechlab”);
i = printf(“%d “, i);
printf(“%d “, i);
return 0;
}

A. Alfatechlab 11 3
B. Alfatechlab 14 2
C. Alfatechlab 12 3
D. Compilation Error

View Answer

Ans : A
Explanation: In C, printf() returns the number of characters successfully written on the output. Here Alfatechlab contain 11 character therefore i = 11 and then i is printed now again value of printf is assign but this time it print 3 since it contain 3 character %,d and space.
i = printf(“alfatechlab”); // print 11
i = printf(“%d “, i);// 3

6. Output of this statement is :

printf ( “%d” , printf ( “Alfatechlab” ) );

A. Syntex Error
B. Alfatechlab11
C. gives garbage value
D. print hello and terminates

View Answer

Ans : B
Explanation: Firstly inner printf executes and will print Alfatechlab now this return the number of character printed that is 11 and this will be printed by outer printf . Hence output is Alfatechlab11

7. What is the output of this program?

#include <stdio.h>
# define scanf “%s Learn Coding “
main()
{
printf(scanf, scanf);
return 0;
}

A. %s Learn Coding Learn Coding
B. %s Learn Coding, %s Learn Coding
C. Invalid Syntex
D. Run time error

View Answer

Ans : B
Explanation: printf statement will become printf(“%s Learn Coding, %s Learn Coding “);

8. What is the output of this program?

#include <stdio.h>
int main()
{
printf(“%d”, main);
return 0;
}

A. Goes in infinite loop
B. Compilation Error
C. Gives garbage value
D. Gives Address of function main

View Answer

Ans : D
Explanation: Name of the function is actually a pointer variable to the function and prints the address of the function.

9. What is the output of this program?

#include <stdio.h>
int main()
{
int i;
i = 4, 5, 6;
printf(“%d”, i);
return 0;
}

A. 4
B. 5
C. 6
D. Invalid Syntax

View Answer

Ans : A
Explanation: Associativity of comma operator is from left to right, but = operator has higher precedence than comma operator.Therefore the statement i = 4, 5, 6 is treated as i = 4 .

10. Comment on the given statment:

scanf(“%d”,i);

A. Will give Segmentation fault
B. Will execute without any error
C. Will give Compilation Error
D. None of the above

View Answer

Ans : A
Explanation: A segmentation fault occurs when a program attempts to access a memory location that it is not allowed to access, or attempts to access a memory location in a way that is not allowed.So as we can see segmentation fault occurs because program attempts to access a memory location that it is not allowed to access.

11. What is the output of this program?

#include <stdio.h>
int main()
{
int x = 1, y = 2;
printf(“%d,%d”, x, y);
return 0;
}

A. 12
B. 1,2
C. Compilation Error
D. Garbage Value

View Answer

Ans : A
Explanation: Printf function print all %d value of passing variable

12. What is the output of this program?

#include <stdio.h>
int main()
{
int x = 3, y = 5;
printf(“%*d”, x, y);
return 0;
}

A. 3
B. 5
C. Compilation Error
D. Garbage Value

View Answer

Ans : B
Explanation: the “*” above means or is used to specify the length of space required to print the integer and printf now takes two arguments one for space and other for integer so printf(“%*d”, x, y); will be print 5

13. What is the output of this program?

#include <stdio.h>
int main()
{
char str[25];
printf(” %d “,printf(“c-hello”));
return 0;
}

A. 7 c-hello
B. 9 c-hello
C. c-hello 9
D. c-hello 7

View Answer

Ans : D
Explanation: Inner printf() will print first and then outer printf will display the length of the inner printf’s string.

14. What is the output of this program?

#include <stdio.h>
# define loop while(true)
int main()
{
loop;
printf(“c-alfatechlab”);
return 0;
}

A. Compilation error
B. c-alfatechlab
C. program never ends
D. None of the above

View Answer

Ans : A
Explanation: error: ‘true’ undeclared (first use in this function)

15. What is the output of this program?

#include <stdio.h>
int main()
{
printf(“%d”, 5.00);
return 0;
}

A. Compilation error
B. 5.00
C. 5
D. Garbage value

View Answer

Ans : D
Explanation: The output will be garbage value.

16. What is the output of this program?

#include <stdio.h>
int main()
{
printf(“%d”,5.25);
return 0;
}

A. Compilation error
B. Garbage value
C. 5
D. 0

View Answer

Ans : B
Explanation: Give Garbage value becausse 5.25 is neitheir a pure integer number(5) nor impure integer number(5.00).

17. What is the output of this program?

#include <stdio.h>
int main()
{
int a = 3;
printf(“%d”);
return 0;
}

A. Garbage value
B. Compilation error
C. 3
D. Runtime error

View Answer

Ans : A
Explanation: As there is no declaration of variable a in printf function, a standard C compiler printf some garbage value as an output. This program is tested under Dev cpp and in standard online c compiler.

18. What is the output of this program?

#include <stdio.h>
int main()
{
char *ptr = “Welcome”;
printf(ptr+2);
return 0;
}

A. pointer cannot be initialized
B. lcome
C. Runtime error
D. Welco

View Answer

Ans : B
Explanation: In printf, initial address of *ptr is incremented by 2 , thus it neglect “We” to welcome

19. What is the output of this program 32 bit c compiler ?

#include <stdio.h>
int main()
{
int x = 1;
printf(“%d %p”,x,x);
return 0;
}

A. Runtime error
B. 1 0x1
C. 1 00000001
D. %p is not a format specifier

View Answer

Ans : B
Explanation: %p is a format specifier to print a pointer in printf or sprintf. For 64 bit c compiler, the output will be 1 0x1

20. What is the output of this program?

#include <stdio.h>
static struct student
{
int x;
int y;
}
struct_var{2,3};
int main()
{
printf(“%d %d”,struct_var.x,struct_var.y);
return 0;
}

A. Runtime Error
B. Improper representation of structure variable
C. 2 3
D. Compilation error

View Answer

Ans : D
Explanation: It will give compilation error.

21. What is the output of this program?

int main() {
int i=1;
i=2+2*i++;
printf(“%d”,i);
return 0;
}

A. 2
B. 3
C. 4
D. 5

View Answer

Ans : C
Explanation: This is undefined behaviour, since i is modified more than once between sequence points. For instance, this compiler gives 4 as the answer, because it puts the increment after the assignment. Another reasonable answer is 6, if the increment is before the assignment.

22. What is the output of this program?

main ( )
{
int i;
i=1;
i=i+2*i++;
printf( “%d” , i);
}

A. 2
B. 3
C. 4
D. 5

View Answer

Ans : C
Explanation: This is undefined behavior, since i is modified more than once between sequence points. For instance, this compiler gives 4 as the answer, because it puts the increment after the assignment

23. What is the output of this program?

main()
{
int a;
a = 4+3, 4>3, 1;
printf( “%d” , a);
}

A. 7
B. 4
C. 3
D. 5

View Answer

Ans : A
Explanation: 7 is the output of this program.

24. What is the output of this program?

main ()
{
int a =6;
printf( “%d %d %d ” , a,a<<2,a>>2);
}

A. 6 24 1
B. 5 1 20
C. 5 20 20
D. 5 1 1

View Answer

Ans : A
Explanation: << and >> operation applied on the value of “i” and we get the output.6 24 1

25. What is the output of this program?

main ( )
{
int a=8;
printf( “%d %d %d ” , a,a<<2,a<<2);
}

A. 8 32 32
B. 5 1 20
C. 5 20 20
D. 5 1 1

View Answer

Ans :A
Explanation: << operation applied on the value of “i” and we get the output.8 32 32

26. What is the output of this program?

int main()
{
int i=2;
printf( “%d %d %d ” , i,i<2,i>2);
return 0;
}

A. Compilation error
B. Garbage value
C. 5 0 1
D. 2 0 0

View Answer

Ans : C
Explanation: The code will successfully compiled and give output 2 0 0

27. What is the output of this program?

int main()
{
int i=7;
printf( “%d %d %d ” , i,i&&2,i||2);
return 0;
}

A. 5 1 1
B. Compilation error
C. Garbage value
D. 7 1 1

View Answer

Ans : D
Explanation: The code will successfully compiled and give output 7 1 1 .

28. What is the output of this program?

int main()
{
int i=6;
printf( “%d %d ” , i,i/2);
return 0;
}

A. 5 7
B. 6 3
C. Garbage value
D. 5 0

View Answer

Ans : B
Explanation: The code will successfully compiled and give output 6 3 .

29. What is the output of this program?

int main()
{
int i=2;
i=i+i*i++;
printf(“%d”,i);
return 0;
}

A. 2
B. 9
C. 4
D. 5

View Answer

Ans : B
Explanation: The code will successfully compiled and give output 9.

30. What is the output of this program?

int main()
{
int i=-5;
i=i+i*i++;
printf(“%d”,i);
return 0;
}

A. -2
B. 1
C. -1
D. 16

View Answer

Ans : D
Explanation: The code will successfully compiled and give output 16.

31. What is the output of this program?

int main()
{
int k=5;
printf(“%d == 1 is” “%s”, k, k==1?”TRUE”:”FALSE”);
return 0;
}

A. k == 1 is TRUE
B. 1 == 1 is TRUE
C. 1 == 1 is FALSE
D. 5 == 1 isFALSE

View Answer

Ans : D
Explanation: the output of the program is 5 == 1 isFALSE

32. What is the output of this program?

int main()
{
int k=0;
printf(“%d == 1 is” “%s”, k, k==1?”TRUE”:”FALSE”);
return 0;
}

A. k == 1 is TRUE
B. 2 == 1 is TRUE
C. 0 == 1 isFALSE
D. K == 1 is FALSE

View Answer

Ans : C
Explanation: the output of the program is 0 == 1 isFALSE

33. What is the output of this program?

char *str = “char *str = %c%s%c; main(){ printf(str, 2, str, 2);}”;
int main()
{
printf(str, 4, str, 4);
return 0;
}

A. char *str = char *str = %c%s%c; main(){ printf(str, 2, str, 2);}; main(){ printf(str, 2, str, 2);}
B. char *str = %c%s%c; main(){ printf(str, 4, str, 4);}
C. No output
D. Error in program

View Answer

Ans : A
Explanation: char *str = char *str = %c%s%c; main(){ printf(str, 2, str, 2);}; main(){ printf(str, 2, str, 2);} is the output of this program.

34. What is the output of this program?

main ( )
{
float a=3.2547;
printf(“%2.3f”, a);
return 0;
}

A. 4
B. 4.159
C. 3.255
D. 4

View Answer

Ans : C
Explanation: float a=3.2547; The variable a is declared as an float data type and initialized to value 3.2547; printf(“%2.3f “, a); The precision specifier tells .3f tells the printf function to place three number after the .(dot). Hence the output is 3.255

35. What is the output of this program?

main ( )
{
float a=6.3214;
printf(“%2.1f”, a);
return 0;
}

A. 4
B. 4.1
C. 6.3
D. 4

View Answer

Ans : C
Explanation: float a=6.3214; The variable a is declared as an float data type and initialized to value 6.3214; printf(“%2.1f “, a); The precision specifier tells .1f tells the printf function to place one after the .(dot). Hence the output is 6.3

36. What is the output of this program?

int main()
{
printf(“%c”, ~(‘D’*-1));
return 0;
}

A. A
B. B
C. C
D. D

View Answer

Ans : C
Explanation: The code will successfully compiled and give output C.

37. What is the output of this program?

int main()
{
printf(“%c”, ~(‘p’*-1));
return 0;
}

A. o
B. s
C. m
D. n

View Answer

Ans : A
Explanation: The code will successfully compiled and give output o.

38. What is the output of this program?

int main()
{
char *p;
p=”%d”;
p++;
p++;
printf(p-2, 20);
return 0;
}

A. 11
B. 20
C. Error
D. No output

View Answer

Ans : B
Explanation: The code will successfully compiled and give output 20

39. What is the output of this program?

int main()
{
printf(“%%%%%%”);
return 0;
}

A. %%%
B. %%
C. No output
D. Error

View Answer

Ans : A
Explanation: The code will successfully compiled and give output %%%.

40. What is the output of this program?

int main()
{
int a=120;
printf(“%1d<0x1d>”, a);
return 0;
}

A. 1250
B. 2
C. 50
D. 120<0x1d>

View Answer

Ans : D
Explanation: int a=120; The variable a is declared as an integer type and initialized to value 120. printf(“%1d<0x1d> “, a); It prints the value of variable a. Hence the output of the program is 120.

C plus plus

C++

C

C

About C

Syllabus

Contact Form

Testomonials

Coding Syllabus

Tech Syllabus

Write a code to check whether a number is even or odd

Q1.Write a code to check whether a number is even or odd

Array & String

Array & String