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C program to print multiplication table using while loop and for loop

Posted by: Instanceofjava Posted date: May 14, 2017 / comment : 3 C language interview programs , c programming examples for beginners

C Program to Print Multiplication Table Using While Loop and For Loop

In the programming world, loops are the most basic. It is only by mastering the rules of a loop, and then replacing them with a loop when necessary, that we can program something that is reproducible. This article explores how to print a multiplication table in C using two types of loops: the `for` loop and the `while` loop. In fact, both approaches are often used—not only in commercial programming languages such as Basic but also in later ones like C. Both are also very simple and straightforward, helping you to consolidate your programming skills.

What is a Multiplication Table?

A multiplication table is a table used to define the multiplication operation for an algebraic system. Multiplying 5 by 1, 5 by 2, and so on—all ten answers to these multiplication problems make up the multiplication table of 5. One of the simplest forms is the multiplication table of 1—since 1 multiplied by any number always equals that same number. The product of a number and any of its factors is in this way called a "multiple." For example, multiply a circular disk by its diameter to get the circumference; the product of 3.14 and a disk with a diameter of 1 is 3.14.

Its is very easy to print multiplication table using c program
We need one for loop which iterates from 1 to 10
Inside for loop just multiply numbers and print result in each iteration.
Lets us see an example C program on how to print multiplication table using for loop.
multiplication table program in c using for loop
write a c program to input a number from user and print multiplication table of the given number using for loop. how to print multiplication table of a given number in c programming.

Program #1 : Write a c program to print multiplication table using for loop.Take input from user.

#include <stdio.h>
int main()
{
int n, i;
printf("Enter a Number ");
scanf("%d",&n);
for(i=1; i<=10; ++i)
{
printf("%d * %d = %d \n", n, i, n*i);
}
getch();
}

Output:

Program #2: Write a c program to print multiplication table using while loop

write a c program to print multiplication table of any number using for loop

#include <stdio.h>
int main()
{
int n, i;
printf("Enter a Number ");
scanf("%d",&n);
i=1;
while(i<=10){
printf("%d * %d = %d \n", n, i, n*i);
++i;
}
getch();
}

Output:

Enter a Number
2
2 * 1 = 2
2 * 2 = 4
2 * 3 = 6
2 * 4 = 8
2 * 5 = 10
2 * 6 = 12
2 * 7 = 14
2 * 8 = 16
2 * 9 = 18
2 * 10 = 20

Using a `while` Loop to Print a Multiplication Table

The `while` loop is a control flow statement that allows code to be executed repeatedly based on a given condition. If you want to print the multiplication table of a given number using a `while` loop, here is how you can do it in C:

#include <stdio.h>
int main() {
int number, i = 1;
// Input the number for which you want to print the multiplication table
printf("Enter a number: ");
scanf("%d", &number);
// Use a while loop to print the multiplication table
printf("Multiplication Table of %d using while loop:\n", number);
while (i <= 10) {
printf("%d x %d = %d\n", number, i, number * i);
i++;
}
return 0;
}

Explanation:

Input the Number: The program first asks the user to input a number for which the multiplication table will be generated.
Initialize `i`: The variable `i` is initialized to 1, which will act as the multiplicand.
While Loop Condition: As long as `i` is less than or equal to 10, the loop continues.
Print the Result: Within the loop, the program prints the result of `number * i`.
increment `i`: After each iteration, `i` is incremented by 1 to prepare for the next run.

Output Example:

Enter a number: 7
Multiplication Table of 7 using while loop:
7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35
7 x 6 = 42
7 x 7 = 49
7 x 8 = 56
7 x 9 = 63
7 x 10 = 70

Using a `for` Loop to Print a Multiplication Table

The `for` loop is another control flow statement providing a compact way to write loops. If you want to print the multiplication table of a number using a `for` loop, here is how you can do it in C:

#include <stdio.h>
int main() {
int number;
// Input the number for which you want to print the multiplication table
printf("Enter a number: ");
scanf("%d", &number);
// Use a for loop to print the multiplication table
printf("Multiplication Table of %d using for loop:\n", number);
for (int i = 1; i <= 10; i++) {
printf("%d x %d = %d\n", number, i, number * i);
}
return 0;
}

Explanation:

1. input the Number: Just as in the example with the `while` loop, this program first asks the user to input a number.

2. For Loop Initialization: The `for` loop initializes `i` to 1, checks the condition `i <= 10`, and increments `i` on each iteration.

3. Print the Result: The program prints the result of `number * i` inside the loop.

Output:

Enter a number: 7
Multiplication Table of 7 using for loop:
7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35
7 x 6 = 42
7 x 7 = 49
7 x 8 = 56
7 x 9 = 63
7 x 10 = 70

Key Differences Between a `while` Loop and a `for` Loop

Syntax: The syntax of the `for` loop is more succinct than that of the `while` loop. With the `for` loop, we can combine initialization, condition testing, and incrementation all into one line; whereas, in the `while` loop, these steps must be executed separately.

When to Use: Use a `while` loop when you don't know how many times the statement execution will be repeated. Use a `for` loop when you know the number of iterations in advance.

Both loops are powerful tools in the C language for handling repetitive work. By understanding how to use them to print a multiplication table, you can apply these methods to solve more complex problems in the future. Whether you choose a `while` loop or a `for` loop totally depends on your actual use case and coding style. I hope you have fun playing around with the code to understand the range of the multiplication table generated, or even combining the two loops under one program to enhance your understanding of them all. Happy programming!

C program to print prime numbers 1 to n

Posted by: Instanceofjava Posted date: May 14, 2017 / comment : 0 C language interview programs , c programming examples for beginners

Any number which is divisible by 1 and itself is known as prime number.
To check prime number or not in c programming we need to use for loop and iterate from 2 to half of the number.
If any number is divisible then it is non prime number, we can exit the loop.
Now we need to check prime numbers from 1 to 100 or 1 to n.
Logic is same and we are adding one more for loop for 1 to N numbers.
Now we will iterate for loop from 1 to n and check prime or nor for each number.
Lets see an example program on c to check prime numbers from 1 to N.
Prime number program in c using for loop.
prime number program in c using while loop
prime number using while loop in c

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Program #1 : Write a c program to check prime numbers from 1 to N by using for loop.

prime number using for loop in c
C program to check prime number using while loop

#include <stdio.h>
int main()
{
int n, i,j, count = 0;
printf("Enter a Number");
scanf("%d",&n);
for(i=2;i<=n;i++)
{
for(j=2;j<i;j++)
{
if(i%j==0)
break;
else if(i==j+1)
printf("%d\n",i);
}
}
getch();
}

Output:

Prime number program in c using for loop and while loop

Posted by: Instanceofjava Posted date: May 14, 2017 / comment : 2 C language interview programs , c programming examples for beginners

Any number which is divisible by 1 and itself is known as prime number.
To check prime number or not in c programming we need to use for loop and iterate from 2 to half of the number.
If any number is divisible then it is non prime number, we can exit the loop.
Let us see an example program on c to check a number is prime number or not
prime number program in c using for loop

Program #1: Write a c program to check a number is prime number or not using for loop.

#include <stdio.h>
int main()
{
int n, i, count = 0;
printf("Enter number to check prime number or not");
scanf("%d",&n);
for(i=2; i<=n/2; ++i)
{
// check for non prime number
if(n%i==0)
{
count=1;
break;
}
}
if (count==0)
printf("%d is a prime number.",n);
else
printf("%d is not a prime number.",n);
getch();
}

Output:

Program #2: Write a c program to check a number is prime number or not using while loop.

#include <stdio.h>
int main()
{
int n, i, count = 0;
printf("Enter number to check prime number or not");
scanf("%d",&n);
i=2;
while( i<=n/2)
{
// check for non prime number
if(n%i==0)
{
count=1;
break;
}
i++;
}
if (count==0)
printf("%d is a prime number.",n);
else
printf("%d is not a prime number.",n);
getch();
}

Output:

Enter number to check prime number or not
12
12 is not a prime number

C program to check odd or even without using modulus operator and division operator

Posted by: Instanceofjava Posted date: May 14, 2017 / comment : 1 C language interview programs , c programming examples for beginners

If a number is divisible by 2 then is it an even number otherwise it is odd number.
Now we need to check a number is even or odd without using modulus or division operators in c programming language.
Yes we can check a number is even or odd without using division and modulus operators for that we need to use & operator
number &1 ==1 then it is an even number.
Let us check a number is even or not in c program using & operator.
Here is the example program for how to find even of odd number without using modulus in c programming language

Program #1: write a c program to check a number is even or odd without using modulus and division operators in c programming.

Even or odd program in c without using mod operator

#include <stdio.h>
int main()
{
int number;
printf("Enter a number to check even or odd");
scanf("%d", &number);
if((number & 1)==0)
printf("%d is even.", number);
else
printf("%d is odd.", number);
getch();
}

Output:

We can check a number is even or odd without using modulus and division operator in c program
The another method is using shift operators
number >> 1) <<1==number then it is even number
Like this we can find even or odd number without using modulus in c

Program #2: write a c program to check odd or even without using modulus operator

#include <stdio.h>
int main()
{
int number;
printf("Enter a number to check even or odd");
scanf("%d", &number);
if(( number >> 1) <<1==number)
printf("%d is even.", number);
else
printf("%d is odd.", number);
getch();
}

Output:

Enter a number to check even or odd
4
4 is Even Number

C program for even or odd using for loop

Posted by: Instanceofjava Posted date: May 14, 2017 / comment : 0 C language interview programs , c programming examples for beginners

If a number is divisible by 2 then it is an even number.
If a number is not divisible by to it is an odd number.
To check even or odd number in c we just need to check that using one if condition.
If if condition of number%2 returns true then it is even number other wise it is odd number.
Let us see an example c program to check a given number is even or odd without using any recursive function.

Program #1: write a c program to check a number is even or odd without using recursive function.

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
int number;
printf("Enter a nuber to check even or odd");
scanf("%d", &number);
// returns true if number is divisible by 2: even
if(number % 2 == 0)
printf("%d is even.", number);
else
printf("%d is odd.", number);
getch();
}

Output:

Program #2: write a c program to check a number is even or odd without using if condition

Check Armstrong number in c using recursive function

Posted by: Instanceofjava Posted date: May 14, 2017 / comment : 0 C language interview programs , c programming examples for beginners

Armstrong number is a number which order of n if
xyz=x ⁿ + y ⁿ + z ⁿ;
To check three digit Armstrong number in c programming
153=1³ * 5³*3³
In the same way we can also check four digit Armstrong number
1634=1⁴+6⁴+3⁴+4⁴ is Armstrong number.
Now let us check a four digit number is armstrong or not by using recursive function in c.
Armstrong number in c using recursion function.
Four digit armstrong number in c. check below program for four digit or n digit armstrong number in c programming.

Program #1: Write a c program to check four / 4 digit number or N digit number is armstrong number or not by using recursive function

#include <stdio.h>
#include <stdlib.h>
int powerfun(int, int);
int main()
{
int n, sum = 0, temp, remainder, digits = 0;
printf("Input number to check Armstrong or not");
scanf("%d", &n);
temp = n;
// check the number of digits in given number
while (temp != 0) {
digits++;
temp = temp/10;
}
temp = n;
while (temp != 0) {
remainder = temp%10;
sum = sum + powerfun(remainder, digits);
temp = temp/10;
}
if (n == sum)
printf("%d is an Armstrong number.\n", n);
else
printf("%d is not an Armstrong number.\n", n);
getch();
}
int powerfun(int num, int r) {
int c, res = 1;
for (c = 1; c <= r; c++)
res = res*num;
return res;
}

Output:

C program to check number is armstrong number or not

Posted by: Instanceofjava Posted date: May 14, 2017 / comment : 0 C language interview programs , c programming examples for beginners

Armstrong number is a number which order of n if
xyz=x ⁿ + y ⁿ + z ⁿ;
To check three digit Armstrong number in c programming
153=1³ * 5³*3³
In the same way we can also check four digit Armstrong number
1634=1⁴+6⁴+3⁴+4⁴ is Armstrong number.
In c Programming to check a number is armstrong or not we need to split that number and need to find nth power of each number and sum all the results.
If total sum is equal to the same number then we can say it is Armstrong number.
Let us see an Example program in c to check a number is Armstrong number or not without using recursion.
First we will check a three digit number is armstrong number or not

Program #1 : write a c program to check a three digit number is armstrong number or not without using recursion.

#include <stdio.h>
#include <stdlib.h>
void main(){
int number, originalNumber, rem, result = 0;
printf("Enter a three digit number to check armstrong number or not: ");
scanf("%d", &number);
originalNumber = number;
while (originalNumber != 0)
{
rem = originalNumber%10;
result += rem*rem*rem;
originalNumber /= 10;
}
if(result == number)
printf("%d is an Armstrong number.",number);
else
printf("%d is not an Armstrong number.",number);
getch();
}

Output:

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