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C program to swap two numbers without using third variable and using functions

Posted by: Instanceofjava Posted date: May 19, 2017 / comment : 0 C language interview programs , c programming examples for beginners

C program to swap two numbers using functions temporary variable.
We can swap two numbers by using temporary variable.
Lets see an example C program to swap two numbers without using any function.
C program to swap two numbers using third variable

Program #1: Write a C program to swap two numbers using temporary variable without using any function and by using third variable.

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
int a,b, temp;
printf("Please enter two integer number to swap\n");
scanf("%d%d",&a,&b);
printf("before swapping\n");
printf("a=%d\n",a);
printf("b=%d",b);
temp=a;
a=b;
b=temp;
printf("\nafter swapping\n");
printf("a=%d\n",a);
printf("b=%d",b);
return 0;
}

Output:

Program #2: Write a C program to swap two numbers using temporary variable with using function and using third variable.

C program to swap two numbers using functions call by value

#include <stdio.h>
#include <stdlib.h>
void swap(int a, int b);
int main(int argc, char *argv[])
{
int a,b;
printf("Please enter two integer numbers to swap\n");
scanf("%d%d",&a,&b);
printf("before swapping\n");
printf("a=%d\n",a);
printf("b=%d",b);
swap(a,b);
return
}
void swap(int a, int b){
int temp=a;
a=b;
b=temp;
printf("\nafter swapping\n");
printf("a=%d\n",a);
printf("b=%d",b);
}

Output:

Please enter two integer numbers to swap
10
20
before swapping
a=10
b=20
after swapping
a=20
b=10

C program to print patterns of numbers,alphabets and stars in a pyramid shape

Posted by: Instanceofjava Posted date: May 15, 2017 / comment : 3 c programming examples for beginners , c programming language

We can print *'s in pyramid pattern using C programming language.
We can also print patterns of numbers and alphabets using C program.
Now Check below program that how to print pyramid pattern of * using C program using for loop.
C program to print patterns of numbers and stars in a pyramid shape

Program #1 : Write a C program to print pyramid pattern of numbers using for loop.

#include <stdio.h>
#include <stdlib.h>
int main(){
int i, j, rows;
printf("Enter number of rows: \n");
scanf("%d",&rows);
for(i=1; i<=rows; ++i)
{
for(j=1; j<=i; ++j)
{
printf("* ");
}
printf("\n");
}
getch();
}

Output:

Program #2 : Write a C program to print pyramid pattern of numbers using for loop.

#include <stdio.h>
#include <stdlib.h>
int main(){
int i, j, rows;
printf("Enter number of rows to print pyramid numbers pattern \n ");
scanf("%d",&rows);
for(i=1; i<=rows; ++i)
{
for(j=1; j<=i; ++j)
{
printf("%d ",j);
}
printf("\n");
}
return 0;
}

Output:

Enter number of rows to print pyramid numbers pattern
10
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10

Program #3 : Write a c program to print patterns of numbers and alphabets

#include <stdio.h>
#include <stdlib.h>
int main(){
int i, j;
char input, alphabet = 'A';
printf("Enter the uppercase character you want to print in last row: ");
scanf("%c",&input);
for(i=1; i <= (input-'A'+1); ++i)
{
for(j=1;j<=i;++j)
{
printf("%c", alphabet);
}
++alphabet;
printf("\n");
}
getch();
}

Output:

Enter the uppercase character you want to print in last row:
I
A
BB
CCC
DDDD
EEEEE
FFFFFF
GGGGGGG
HHHHHHHH
IIIIIIIII

C program to find leap year using conditional operator

Posted by: Instanceofjava Posted date: May 15, 2017 / comment : 0 c programming examples for beginners , c programming language

We have already seen how to check leap year or not using C program here
Now we need to find out a leap year by using conditional operator using C programming language.
expression ? value1 : value2
if expression is true then it picks value1 else value2.
Let us see an example C program to check a year is leap year or not by using conditional operator.

Program #1: Write a C program to find leap year using conditional operator without using any function and loops.

#include <stdio.h>
#include <stdlib.h>
int main(){
int year;
printf("Enter a year to check if it is a leap year or not \n");
scanf("%d", &year);
(year%4==0 && year%100!=0) ? printf("Leap Year") :
(year%400 ==0 ) ? printf("Leap Year") : printf("not a leap year");
getch();
}

Output:

Enter a year to check if it is a leap year or not
2012
Leap Year

this program prompts the user to enter a year and then uses the conditional operator to check if the year is a leap year. The condition being checked is whether the year is evenly divisible by 4 and not divisible by 100, or if it is evenly divisible by 400. If the year is a leap year, the program will print "year is a leap year.", otherwise it will print "year is not a leap year."

The conditional operator is represented by the ? symbol. It takes three operands: a condition, an expression to execute if the condition is true, and an expression to execute if the condition is false.

In this example, the condition is (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0), the first expression to execute if the condition is true is printf("%d is a leap year.\n", year) and the second expression if the condition is false is printf("%d is not a leap year.\n", year)

It's important to note that this program doesn't take into account the Julian calendar and leap year rules before the Gregorian calendar.

In summary, this is a simple C program that uses the conditional operator to check if a year is a leap year, by evaluating a condition that checks if the year is evenly divisible by 4 and not divisible by 100, or if it is evenly divisible by 400. The program uses the ternary operator to make the code more concise and readable.

C program to find leap year using if else

Posted by: Instanceofjava Posted date: May 15, 2017 / comment : 0 C language interview programs , c programming examples for beginners , c programming language

A year is said to be leap year if it is divisible by 4.
For example 2004 , 2008,2012 and 2016.
A year is also a leap year if it is divisible by 100 and divisible by 400.
For example 1600 and 2000 etc.
A leap year of February moth will have 29 days.
Let us see an example C program to check a year is leap year or not using simple if condition.
First we need to check a year is divisible by 4 or not.
If yes then again one more condition if it is divisible by 100 and 400. if it is divisible by 100 then it should be divisible by 400 then only it is leap year.
c program code to find leap year using if else

Program #1: Write a C program to check a year is leap year or not

#include <stdio.h>
#include <stdlib.h>
// Function to check if a year is a leap year
int isLeapYear(int year) {
// Logic for leap year:
// A year is a leap year if:
// 1. It is divisible by 4
// 2. If divisible by 100, it must also be divisible by 400
if (year % 4 == 0) {
if (year % 100 == 0) {
if (year % 400 == 0) {
// Year is divisible by 400
return 1; // It is a leap year
} else {
// Year is divisible by 100 but not by 400
return 0; // Not a leap year
}
} else {
// Year is divisible by 4 but not by 100
return 1; // It is a leap year
}
} else {
// Year is not divisible by 4
return 0; // Not a leap year
}
}
int main() {
// Program to check leap year in C programming
// Input year and output whether it is a leap year or not
int year; // Variable to store year input by user
printf("=== Leap Year Checker in C ===\n\n");
printf("This program checks if a given year is a leap year or not.\n\n");
// Prompt user for input
printf("Enter a year to check: ");
scanf("%d", &year);
// Call function to check leap year
if (isLeapYear(year)) {
printf("%d is a leap year!\n", year);
} else {
printf("%d is not a leap year.\n", year);
}
// Demonstrating the leap year logic with examples
printf("\nExamples of leap year logic:\n");
printf("- 2000: Divisible by 400, so it is a leap year.\n");
printf("- 1900: Divisible by 100 but not by 400, so not a leap year.\n");
printf("- 2016: Divisible by 4 but not by 100, so it is a leap year.\n");
printf("- 2019: Not divisible by 4, so not a leap year.\n\n");
// Prompt for additional checks
char choice;
do {
printf("Would you like to check another year? (y/n): ");
scanf(" %c", &choice);
if (choice == 'y' || choice == 'Y') {
printf("\nEnter a year to check: ");
scanf("%d", &year);
// Call function again for the new input
if (isLeapYear(year)) {
printf("%d is a leap year!\n", year);
} else {
printf("%d is not a leap year.\n", year);
}
}
} while (choice == 'y' || choice == 'Y');
printf("\nThank you for using the Leap Year Checker in C program!\n");
return 0;
}

Output:

=== Leap Year Checker in C ===
This program checks if a given year is a leap year or not.
Enter a year to check: 2000
2000 is a leap year!
Examples of leap year logic:
- 2000: Divisible by 400, so it is a leap year.
- 1900: Divisible by 100 but not by 400, so not a leap year.
- 2016: Divisible by 4 but not by 100, so it is a leap year.
- 2019: Not divisible by 4, so not a leap year.
Would you like to check another year? (y/n): n
Thank you for using the Leap Year Checker in C program!

Program #2: Write a C program to check a year is leap year or not without using any function.

#include <stdio.h>
#include <stdlib.h>
int main(){
int year;
printf("Enter a year to check if it is a leap year or not \n");
scanf("%d", &year);
if ( year%400 == 0)
printf("%d is a leap year.\n", year);
else if ( year%100 == 0)
printf("%d is not a leap year.\n", year);
else if ( year%4 == 0 )
printf("%d is a leap year.\n", year);
else
printf("%d is not a leap year.\n", year);
return 0;
}

Output:

C program to find sum of n numbers using for loop

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

C program to find sum of n numbers using function
This is about to get sum of all natural numbers in C using for loop
For example 4: 1+2+3+4=11
Let us see an example program to get sum of natural numbers using while loop.
c program to find sum of n numbers using for loop

Program #1 : Write a C program to get sum of all natural numbers up to n using for loop

// www. instanceofjava.com all rights reserved
#include<stdio.h>
#include<math.h>
int main()
{
int n, i, sum = 0;
printf("Enter a positive integer: ");
scanf("%d",&n);
for(i=1; i <= n; ++i)
{
sum += i; // sum = sum+i;
}
printf("Sum = %d",sum);
return 0;
}

Output:

In this program, we first declare three variables: n, i, and sum. We use the printf function to prompt the user to enter the value of n, and the scanf function to read the value entered by the user and store it in the n variable.

The for loop iterates from 1 to n, and for each iteration, the current value of i is added to the sum variable. Once the loop completes, the final value of sum is the sum of the first n natural numbers.

The program then prints the final value of sum using the printf function.

You can try running this program and entering different values for n to see how it works.

Note: This program assumes that the input will be valid. You may want to include error check for non-integer input or negative number input.

C program to reverse a number using while loop and for loop

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

Finding reverse number means for example take 123 then we need to get 321 is its reverse number.
In c programming we can do it by using for loop and while loop.
Lets us see an example C program to get reverse number of a number by using while loop and for loop.
while(n != 0)
{
rem = n%10;
reverse_Number = reverse_Number*10 + rem;
n /= 10;
}

Program #1 : Write a c program to reverse number using for loop.

#include <stdio.h>
int main()
{
int n, reverse_Number = 0, rem,Original_number=0;
printf("Enter a number to get reverse number ");
scanf("%d", &n);
Original_number=n;
while(n != 0)
{
rem = n%10;
reverse_Number = reverse_Number*10 + rem;
n /= 10;
}
printf("Reversed Number of %d is = %d",Original_number=0;,reverse_Number);
getch();
}

Output:

Program #2 : Write a C program to reverse a number using for loop

#include <stdio.h>
int main()
{
int n, reverse_Number = 0, rem,Original_number=0;
printf("Enter a number to get reverse number ");
scanf("%d", &n);
Original_number=n;
for(;n != 0;)
{
rem = n%10;
reverse_Number = reverse_Number*10 + rem;
n /= 10;
}
printf("Reversed Number of %d is = %d",Original_number,reverse_Number);
getch();
}

Output:

Enter a number to get reverse number
123987
Reversed Number of 123987 is = 789321

C program to convert binary to decimal using for loop

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

c program to convert binary to decimal using array and for loop.
Lets us see an example program on c to convert binary format number to decimal format.
Write a function which accepts a number as binary.
rem = n%10;
n /= 10;
decimal += rem*pow(2,i);
This is the logic to get decimal format of the number.

Program #1 : write a c program to convert binary to decimal using while loop function

#include <stdio.h>
int convertBinaryToDecimal(long long n);
int main()
{
long long n;
printf("Enter a binary number: ");
scanf("%lld", &n);
printf("%lld binary format= %d decimal format", n, convertBinaryToDecimal(n));
getch();
}
int convertBinaryToDecimal(long long n)
{
int decimal = 0, i = 0, rem;
while (n!=0)
{
rem = n%10;
n /= 10;
decimal += rem*pow(2,i);
++i;
}
return decimal;
}

Output:

Program #2 : write a c program to convert binary to decimal using while loop function

#include <stdio.h>
int convertBinaryToDecimal(long long n);
int main()
{
long long n;
printf("Enter a binary number: ");
scanf("%lld", &n);
printf("%lld binary format= %d decimal format", n, convertBinaryToDecimal(n));
getch();
}
int convertBinaryToDecimal(long long n)
{
int decimal = 0, i = 0, rem;
for (i=0; n!=0;i++)
{
rem = n%10;
n /= 10;
decimal += rem*pow(2,i);
}
return decimal;
}

Output:

Enter a binary number:
1011
1011 binary format= 11 decimal format