InstanceOfJava: C language interview programs

C initialize an array

Posted by: saidesh Posted date: 8:38 PM / comment : 0 C language interview programs , c programming examples for beginners

Array is collection of similar data items.
An array can hold multiple values of same type of data
In c programming language an array can be declared as datatype arrayName [ arraySize ];
In c , while declaring an array we need to specify type of array , name of array and size of the array.
One can directly initialize an array while declaring itself with some values
int arrayVariable[2]=[10,20];
int count[]=[1,2,3,4,5]
directly initialize an array of particular : count[3]=10
Let us discuss about how to initialize an array with some default values.
Using for loop or while loop we can iterate an array and by accessing each index we can assign values
If we are not initializing an array and try to print all the values then it will print some garbage values.
c initialize array of ints

#1Write a C program to declare an array and print default values

#include <stdio.h>
// write a c program to explain how to initialize an array
int main () {
int number[ 15 ];
int i,k;
for (k = 0; k < 15; k++ ) {
printf("Array[%d] = %d\n", k, number[k] );
}
getch();
}

Output:

Array[0] = -1551778920
Array[1] = -2
Array[2] = 1971427546
Array[3] = 1971495162
Array[4] = 5189464
Array[5] = 5181048
Array[6] = 2686776
Array[7] = 1971494685
Array[8] = 0
Array[9] = 0
Array[10] = 2686832
Array[11] = 200
Array[12] = 192
Array[13] = 7161720
Array[14] = 48

#2 write a C Program to initialize an array values to 0 (zeros).

Output:

Array[0] = 0
Array[1] = 0
Array[2] = 0
Array[3] = 0
Array[4] = 0
Array[5] = 0
Array[6] = 0
Array[7] = 0
Array[8] = 0
Array[9] = 0
Array[10] = 0
Array[11] = 0
Array[12] = 0
Array[13] = 0
Array[14] = 0

C program to check whether a character is vowel or consonant

Posted by: saidesh Posted date: 8:32 PM / comment : 0 C language interview programs , c programming examples for beginners

In this program we will discuss about how to check whether a character is vowel or consonant.
In English language will be having 5 vowels and 21 consonants.
To check entered character is vowel or consonant, first Read input character from user using scanf.
There are only 5 vowels(A,E,I,O,U), so we need to check entered character is there in those 5 characters.
If it is present then we can say its an vowel, otherwise it is a consonant.
While checking we need to consider case sensitivity. So we need to check both uppercase vowels and lower case vowels.
Lets see an example program to check whether entered character is vowel or not.

Write a program to determine whether the input character is a vowel or consonant or not an alphabet

#include <stdio.h>
//write a program to determine whether the input character is a vowel or consonant or not an alphabet
//c program to check whether a character is vowel or consonant
//www.InstanceofJava.com
int main() {
char character;
int lowercaseVowel, uppercaseVowel;
printf("Enter a character ");
scanf("%c", &character);
// assigns 1
lowercaseVowel = (character == 'a' || character == 'e' || character == 'i' || character == 'o' || character == 'u');
// evaluates to 1 if variable c is a uppercase vowel
uppercaseVowel = (character == 'A' || character == 'E' || character == 'I' || character == 'O' || character == 'U');
// evaluates to 1 (true) if c is a vowel
if (lowercaseVowel || uppercaseVowel)
printf("%c is a vowel.", character);
else
printf("%c is a consonant.", character);
getch();
}

Output:

Enter a character
I
I is an vowel

Print prime numbers from 1 to 100 in c

Posted by: saidesh Posted date: 2:27 PM / comment : 0 C language interview programs , c programming examples for beginners

Lets discuss a program on how to print prime numbers from 1 to 100.
Here by default we need to print all prime numbers from 1 to 100.
No need to ask user to enter a number because we need to end loop at 100.
Using for loop iterate from 1 to 100
Take one more loop and check each number is divisible by 1 and itself or not.
Program to print prime number between 1 to 100 in c

#1.C program to print prime numbers from 1 to 100

#include <stdio.h>
// c program to print prime numbers from 1 to 100
// www.instanceofjava.com
int main()
{
int n, i,k, count = 0;
printf("Prime numbers from 1 to 100\n");
for(i=2;i<=100;i++)
{
for(k=2;k<i;k++)
{
if(i%k==0)
break;
else if(i==k+1)
printf("%d\n",i);
}
}
getch();
}

Sum of two integers in c

Posted by: saidesh Posted date: 2:02 PM / comment : 0 C language interview programs , c programming examples for beginners

Check here for printing an integer in c
We have 4 basic data types in c programming language
int, char, float and double
For storing numbers or integers we will use int data type.
Lets see an example program sum of two integers in c programming language.
To add two integers we need two int type variables and third variable to store result of sum of two integers.
Its a basic level example program for beginners to understand integer data types

Write a C program to add two integers / find sum of two integers in c

#include<stdio.h>
// c program to print integer using %d
// c print integer
//www.instanceofjava.com
int main()
{
//declare an integer variable
int number1, number2, sumOfTwoIntegers;
// read input from user using scanf
printf ("Enter any two integers: ");
scanf (" %d%d", &number1,&number2);
//sum of two integers in c
sumOfTwoIntegers=number1+number2;
//print the same number using %d
printf("Sum of two integers : %d", sumOfTwoIntegers);
getch();
}

Output:

Enter any two integers:
10
20
Sum of two integers : 30

Print an integer in c language

Posted by: saidesh Posted date: 1:42 PM / comment : 0 C language interview programs , c programming examples for beginners

For declaring numbers we use int data type in c.
In order to read using scanf we use %d.
using printf we can print same variable.

#Write a C Program to print an integer

#include<stdio.h>
// c program to print integer using %d
// c print integer
//www.instanceofjava.com
int main()
{
//declare an integer variable
int number;
// read input from user using scanf
printf ("Enter an Integer: ");
scanf (" %d", &number);
//print the same number using %d
printf("You Entered : %d", number);
getch();
}

Output:

Enter an Integer: 3
You Entered : 3

Sum of even numbers in c

Posted by: saidesh Posted date: 10:33 AM / comment : 0 C language interview programs , c programming examples for beginners

Please check this below program which prints even numbers from 1 to n.

Print even numbers in c
To print sum of even numbers from 1 to n first we need to get all the even numbers and add them.
Using for or while loop iterate from 1 to n number and get all even numbers
sum=sum+evenNumber
C program to find sum of even numbers using while loop

C program to find sum of even numbers using while loop

#include<stdio.h>
//write a program to print even numbers in c using while loop
//www.instanceofjava.com
int main()
{
// declare variables
int number,i,sum=0;
//read input from user
printf("Enter a number: ");
scanf("%d", &number);
//iterate and check if it a even number or not
i=1;
while(i<=number){
if(i%2 ==0){
printf("%d\n" ,i);
sum=sum+i;
}
i++ ;
}
printf("sum of all even numbers = %d",sum);
getch();
}

Output:

Enter a number:8
2
4
6
8
sum of all even numbers= 20

Print even numbers in c

Posted by: saidesh Posted date: 9:51 AM / comment : 0 C language interview programs , c programming examples for beginners

Lets see how to write a c program to print even numbers using c programming.\
Its a basic example to print only even numbers
Use for loop and iterate from 1 to n.
In each iteration check if number if divisible by 2 (n%2 == 0). if yes then its a even number otherwise it is a odd number.
C program to print even numbers from 1 to n.

#include<stdio.h>
//write a program to print even numbers in c
//www.instanceofjava.com
int main()
{
// declare variables
int number,i;
//read input from user
printf("Enter a number: ");
scanf("%d", &number);
//iterate and check if it a even number or not
for (i=1; i<=number; i++){
if(i%2 ==0){
printf("%d\n" ,i);
}
}
getch();
}

Output:

Enter a number: 12
2
4
6
8
10
12

#2 print even numbers in c using while loop

Now we will try to print even numbers using while loop
Only difference is replace for with while loop
Variable initialization will be done before loop
condition will be inside while(condition)
increment or decrement will be last line of while block
Lets print even numbers using while loop from 1 to n.

#include<stdio.h>
//write a program to print even numbers in c using while loop
//www.instanceofjava.com
int main()
{
// declare variables
int number,i;
//read input from user
printf("Enter a number: ");
scanf("%d", &number);
//iterate and check if it a even number or not
i=1;
while(i<=number){
if(i%2 ==0){
printf("%d\n" ,i);
}
i++ ;
}
getch();
}

Output:

Enter a number: 20
2
4
6
8
10
12
14
16
18
20

Subscribe to: Posts ( Atom )