C programming 28 program More information Follow YouTube & Facebook https://www.youtube.com/channel/UC9lsTSoLqIEC85MU9tqFqOA/playlists https://www.facebook.com/fcoursesbd

1. https://www.facebook.com/fcoursesbd Page 1 of 31
C Programming 28 Program
Table of Contents
Page no
1) C Program to Check Whether a Number is Even or Odd...................................................................................................12
2) C Program to Check Whether a Character is Vowel or Consonant ........................................................................................22
3) C Program to Find the Largest Number Among Three Numbers .......................................................................................33
4) C Program to Check Leap Year ....................................................................................................................................................45
5) C Program to Check Whether a Number is Positive or Negative ...........................................................................................55
6) C Program to Check Whether a Character is an Alphabet or not ......................................................................................66
7 ) C Program to Generate Multiplication Table ....................................................................................................................77
8 ) C Program to Display Fibonacci Sequence .........................................................................................................................88
9 ) C Program to Find GCD of two Numbers............................................................................................................................99
10 ) C Program to Find LCM (Lowest Common Multiple) of two Number ...........................................................................101
11) C Program to Display Characters from A to Z Using Loop ..............................................................................................111
12) C Program to Reverse a Number.....................................................................................................................................122
13 ) C Program to Calculate the Power of a Number............................................................................................................133
14) C Program to Check Whether a Number is Palindrome or Not......................................................................................144
15) C Program to Check Whether a Number is Prime or Not...............................................................................................155
16) C Program to Display Prime Numbers Between Two Intervals......................................................................................166
17 ) C Program to Check Armstrong Number........................................................................................................................177
18) C Program to Display Factors of a Number.....................................................................................................................188
19) C Programming Code To Create Pyramid and Pattern ...................................................................................................199
20) C Program to Make a Simple Calculator Using switch...case .........................................................................................200
21) C Programming Code To Create Pyramid and Pattern ...................................................................................................211
22) C Program to Display Prime Numbers Between Intervals Using Function ....................................................................222
23) C Program to Check Prime or Armstrong Number Using User-defined Function..........................................................233
24) C Program to Find the Sum of Natural Numbers using Recursion .................................................................................255
25) C Program to Find Factorial of a Number Using Recursion ...........................................................................................266
26) C Program to Find G.C.D Using Recursion.......................................................................................................................277
27) C program to Reverse a Sentence Using Recursion........................................................................................................288
28) C program to calculate the power using recursion.........................................................................................................299

2. https://www.facebook.com/fcoursesbd Page 2 of 31
1) C Program to Check Whether a Number is Even or Odd
#include <stdio.h>
int main()
{
int number;
printf("Enter an integer: ");
scanf("%d", &number);
if(number % 2 == 0)
printf("%d is even.", number);
else
printf("%d is odd.", number);
return 0;
}
Output

3. https://www.facebook.com/fcoursesbd Page 3 of 31
2) C Program to Check Whether a Character is Vowel or Consonant
#include <stdio.h>
int main()
{
char c;
int isLowercaseVowel, isUppercaseVowel;
printf("Enter an alphabet: ");
scanf("%c",&c);
isLowercaseVowel = (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');
isUppercaseVowel = (c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U');
if (isLowercaseVowel || isUppercaseVowel)
printf("%c is a vowel.", c);
else
printf("%c is a consonant.", c);
return 0;
}
Output

4. https://www.facebook.com/fcoursesbd Page 4 of 31
3) C Program to Find the Largest Number Among Three Numbers
#include <stdio.h>
int main()
{
double n1, n2, n3;
printf("Enter three numbers: ");
scanf("%lf %lf %lf", &n1, &n2, &n3);
if( n1>=n2 && n1>=n3)
printf("%.2lf is the largest number.", n1);
else if (n2>=n1 && n2>=n3)
printf("%.2lf is the largest number.", n2);
else
printf("%.2lf is the largest number.", n3);
return 0;
}
Output

5. https://www.facebook.com/fcoursesbd Page 5 of 31
4) C Program to Check Leap Year
#include <stdio.h>
int main()
{
int year;
printf("Enter year : ");
scanf("%d", &year);
if(((year % 4 == 0) && (year % 100 !=0)) || (year % 400==0))
{
printf("LEAP YEAR");
}
else
{
printf("COMMON YEAR");
}
return 0;
}
Output

6. https://www.facebook.com/fcoursesbd Page 6 of 31
5) C Program to Check Whether a Number is Positive or Negative
#include <stdio.h>
int main()
{
double number;
printf("Enter a number: ");
scanf("%lf", &number);
if (number < 0.0)
printf("You entered a negative number.");
else if ( number > 0.0)
printf("You entered a positive number.");
else
printf("You entered 0.");
return 0;
}
Output

7. https://www.facebook.com/fcoursesbd Page 7 of 31
6) C Program to Check Whether a Character is an Alphabet or not
#include <stdio.h>
int main()
{
char c;
printf("Enter a character: ");
scanf("%c",&c);
if( (c>='a' && c<='z') || (c>='A' && c<='Z'))
printf("%c is an alphabet.",c);
else
printf("%c is not an alphabet.",c);
return 0;
}
Output

8. https://www.facebook.com/fcoursesbd Page 8 of 31
7 ) C Program to Generate Multiplication Table
#include <stdio.h>
int main()
{
int n, i;
printf("Enter an integer: ");
scanf("%d",&n);
for(i=1; i<=10; ++i)
{
printf("%d * %d = %d n", n, i, n*i);
}
return 0;
}
Output

9. https://www.facebook.com/fcoursesbd Page 9 of 31
8 ) C Program to Display Fibonacci Sequence
#include <stdio.h>
int main()
{
int i, n, t1 = 0, t2 = 1, nextTerm;
printf("Enter the number of terms: ");
scanf("%d", &n);
printf("Fibonacci Series: ");
for (i = 1; i <= n; ++i)
{
printf("%d, ", t1);
nextTerm = t1 + t2;
t1 = t2;
t2 = nextTerm;
}
return 0;
}

10. https://www.facebook.com/fcoursesbd Page 10 of 31
9 ) C Program to Find GCD of two Numbers
#include <stdio.h>
int main()
{
int n1, n2, i, gcd;
printf("Enter two integers: ");
scanf("%d %d", &n1, &n2);
for(i=1; i <= n1 && i <= n2; ++i)
{
if(n1%i==0 && n2%i==0)
gcd = i;
}
printf("G.C.D of %d and %d is %d", n1, n2, gcd);
return 0;
}
Output

11. https://www.facebook.com/fcoursesbd Page 11 of 31
10 ) C Program to Find LCM (Lowest Common Multiple) of two Numbers
#include <stdio.h>
int main()
{
int n1, n2, i, gcd, lcm;
printf("Enter two positive integers: ");
scanf("%d %d",&n1,&n2);
for(i=1; i <= n1 && i <= n2; ++i)
{
if(n1%i==0 && n2%i==0)
gcd = i;
}
lcm = (n1*n2)/gcd;
printf("The LCM of two numbers %d and %d is %d.", n1, n2, lcm);
return 0;
}
Output

12. https://www.facebook.com/fcoursesbd Page 12 of 31
11) C Program to Display Characters from A to Z Using Loop
#include <stdio.h>
int main()
{
char c;
for(c = 'A'; c <= 'Z'; ++c)
printf("%c ", c);
return 0;
}
Output

13. https://www.facebook.com/fcoursesbd Page 13 of 31
12) C Program to Reverse a Number
#include <stdio.h>
int main()
{
int n, reverse = 0;
printf("Enter a number to reversen");
scanf("%d", &n);
while (n != 0)
{
reverse = reverse * 10;
reverse = reverse + n%10;
n = n/10;
}
printf("Reverse of entered number is = %dn", reverse);
return 0;
}
Output

14. https://www.facebook.com/fcoursesbd Page 14 of 31
13 ) C Program to Calculate the Power of a Number
#include <stdio.h>
int main()
{
int base, exponent;
long long result = 1;
printf("Enter a base number: ");
scanf("%d", &base);
printf("Enter an exponent: ");
scanf("%d", &exponent);
while (exponent != 0)
{
result *= base;
--exponent;
}
printf("Answer = %lld", result);
return 0;
}
Output

15. https://www.facebook.com/fcoursesbd Page 15 of 31
14) C Program to Check Whether a Number is Palindrome or Not
#include <stdio.h>
int main()
{
int n, reversedInteger = 0, remainder, originalInteger;
printf("Enter an integer: ");
scanf("%d", &n);
originalInteger = n;
while( n!=0 )
{
remainder = n%10;
reversedInteger = reversedInteger*10 + remainder;
n /= 10;
}
if (originalInteger == reversedInteger)
printf("%d is a palindrome.", originalInteger);
else
printf("%d is not a palindrome.", originalInteger);
return 0;
}
Output

16. https://www.facebook.com/fcoursesbd Page 16 of 31
15) C Program to Check Whether a Number is Prime or Not
#include <stdio.h>
int main()
{
int n, i, flag = 0;
printf("Enter a positive integer: ");
scanf("%d", &n);
for(i = 2; i <= n/2; ++i)
{
if(n%i == 0)
{
flag = 1;
break;
}
}
if (n == 1)
{
printf("1 is neither a prime nor a composite number.");
}
else
{
if (flag == 0)
printf("%d is a prime number.", n);
else
printf("%d is not a prime number.", n);
}
return 0;
} Output

17. https://www.facebook.com/fcoursesbd Page 17 of 31
16) C Program to Display Prime Numbers Between Two Intervals
#include <stdio.h>
int main()
{
int low, high, i, flag;
printf("Enter two numbers(intervals): ");
scanf("%d %d", &low, &high);
printf("Prime numbers between %d and %d are: ", low, high);
while (low < high)
{
flag = 0;
for(i = 2; i <= low/2; ++i)
{
if(low % i == 0)
{
flag = 1;
break;
}
}
if (flag == 0)
printf("%d ", low);
++low;
}
return 0;
} Output

18. https://www.facebook.com/fcoursesbd Page 18 of 31
17 ) C Program to Check Armstrong Number
#include <stdio.h>
int main()
{
int number, originalNumber, remainder, result = 0;
printf("Enter a three digit integer: ");
scanf("%d", &number);
originalNumber = number;
while (originalNumber != 0)
{
remainder = originalNumber%10;
result += remainder*remainder*remainder;
originalNumber /= 10;
}
if(result == number)
printf("%d is an Armstrong number.",number);
else
printf("%d is not an Armstrong number.",number);
return 0;
}
Output

19. https://www.facebook.com/fcoursesbd Page 19 of 31
18) C Program to Display Factors of a Number
#include <stdio.h>
int main()
{
int number, i;
printf("Enter a positive integer: ");
scanf("%d",&number);
printf("Factors of %d are: ", number);
for(i=1; i <= number; ++i)
{
if (number%i == 0)
{
printf("%d ",i);
}
}
return 0;
}
Output

20. https://www.facebook.com/fcoursesbd Page 20 of 31
19) C Programming Code To Create Pyramid and Pattern
#include <stdio.h>
int main()
{
int i, j, rows;
printf("Enter number of rows: ");
scanf("%d",&rows);
for(i=1; i<=rows; ++i)
{
for(j=1; j<=i; ++j)
{
printf("* ");
}
printf("n");
}
return 0;
} Output

21. https://www.facebook.com/fcoursesbd Page 21 of 31
20) C Program to Make a Simple Calculator Using switch...case
# include <stdio.h>
int main() {
char operator;
double firstNumber,secondNumber;
printf("Enter an operator (+, -, *,): ");
scanf("%c", &operator);
printf("Enter two operands: ");
scanf("%lf %lf",&firstNumber, &secondNumber);
switch(operator)
{
case '+':
printf("%.1lf + %.1lf = %.1lf",firstNumber, secondNumber, firstNumber + secondNumber);
break;
case '-':
printf("%.1lf - %.1lf = %.1lf",firstNumber, secondNumber, firstNumber - secondNumber);
break;
case '*':
printf("%.1lf * %.1lf = %.1lf",firstNumber, secondNumber, firstNumber * secondNumber);
break;
case '/':
printf("%.1lf / %.1lf = %.1lf",firstNumber, secondNumber, firstNumber / secondNumber);
break;
default:
printf("Error! operator is not correct");
}
return 0; Output
}

22. https://www.facebook.com/fcoursesbd Page 22 of 31
21) C Programming Code To Create Pyramid and Pattern
#include <stdio.h>
int main()
{
int i, space, rows, k=0;
printf("Enter number of rows: ");
scanf("%d",&rows);
for(i=1; i<=rows; ++i, k=0)
{
for(space=1; space<=rows-i; ++space)
{
printf(" ");
}
while(k != 2*i-1)
{
printf("* ");
++k;
}
printf("n");
}
return 0;
}
Output

23. https://www.facebook.com/fcoursesbd Page 23 of 31
22) C Program to Display Prime Numbers Between Intervals Using Function
#include <stdio.h>
int checkPrimeNumber(int n);
int main()
{
int n1, n2, i, flag;
printf("Enter two positive integers: ");
scanf("%d %d", &n1, &n2);
printf("Prime numbers between %d and %d are: ", n1, n2);
for(i=n1+1; i<n2; ++i)
{
flag = checkPrimeNumber(i);
if(flag == 1)
printf("%d ",i);
}
return 0;
}
int checkPrimeNumber(int n)
{
int j, flag = 1;
for(j=2; j <= n/2; ++j)
{
if (n%j == 0)
{
flag =0;
break;
}
} Output
return flag;
}

24. https://www.facebook.com/fcoursesbd Page 24 of 31
23) C Program to Check Prime or Armstrong Number Using User-defined Function
#include <stdio.h>
#include <math.h>
int checkPrimeNumber(int n);
int checkArmstrongNumber(int n);
int main()
{
int n, flag;
printf("Enter a positive integer: ");
scanf("%d", &n);
flag = checkPrimeNumber(n);
if (flag == 1)
printf("%d is a prime number.n", n);
else
printf("%d is not a prime number.n", n);
flag = checkArmstrongNumber(n);
if (flag == 1)
printf("%d is an Armstrong number.", n);
else
printf("%d is not an Armstrong number.",n);
return 0;
}
int checkPrimeNumber(int n)
{
int i, flag = 1;
for(i=2; i<=n/2; ++i)
{
if(n%i == 0)
{
flag = 0;
break;

25. https://www.facebook.com/fcoursesbd Page 25 of 31
}
}
return flag;
}
int checkArmstrongNumber(int number)
{
int originalNumber, remainder, result = 0, n = 0, flag;
originalNumber = number;
while (originalNumber != 0)
{
originalNumber /= 10;
++n;
}
originalNumber = number;
while (originalNumber != 0)
{
remainder = originalNumber%10;
result += pow(remainder, n);
originalNumber /= 10;
}
if(result == number)
flag = 1;
else
flag = 0;
return flag;
}
Output

26. https://www.facebook.com/fcoursesbd Page 26 of 31
24) C Program to Find the Sum of Natural Numbers using Recursion
#include <stdio.h>
int addNumbers(int n);
int main()
{
int num;
printf("Enter a positive integer: ");
scanf("%d", &num);
printf("Sum = %d",addNumbers(num));
return 0;
}
int addNumbers(int n)
{
if(n != 0)
return n + addNumbers(n-1);
else
return n;
}
Output

27. https://www.facebook.com/fcoursesbd Page 27 of 31
25) C Program to Find Factorial of a Number Using Recursion
#include <stdio.h>
long int multiplyNumbers(int n);
int main()
{
int n;
printf("Enter a positive integer: ");
scanf("%d", &n);
printf("Factorial of %d = %ld", n, multiplyNumbers(n));
return 0;
}
long int multiplyNumbers(int n)
{
if (n >= 1)
return n*multiplyNumbers(n-1);
else
return 1;
}
Output

28. https://www.facebook.com/fcoursesbd Page 28 of 31
26) C Program to Find G.C.D Using Recursion
#include <stdio.h>
int hcf(int n1, int n2);
int main()
{
int n1, n2;
printf("Enter two positive integers: ");
scanf("%d %d", &n1, &n2);
printf("G.C.D of %d and %d is %d.", n1, n2, hcf(n1,n2));
return 0;
}
int hcf(int n1, int n2)
{
if (n2 != 0)
return hcf(n2, n1%n2);
else
return n1;
}
Output

29. https://www.facebook.com/fcoursesbd Page 29 of 31
27) C program to Reverse a Sentence Using Recursion
#include <stdio.h>
void reverseSentence();
int main()
{
printf("Enter a sentence: ");
reverseSentence();
return 0;
}
void reverseSentence()
{
char c;
scanf("%c", &c);
if( c != 'n')
{
reverseSentence();
printf("%c",c);
}
}
Output

30. https://www.facebook.com/fcoursesbd Page 30 of 31
28) C program to calculate the power using recursion
#include <stdio.h>
int power(int n1, int n2);
int main()
{
int base, powerRaised, result;
printf("Enter base number: ");
scanf("%d",&base);
printf("Enter power number(positive integer): ");
scanf("%d",&powerRaised);
result = power(base, powerRaised);
printf("%d^%d = %d", base, powerRaised, result);
return 0;
}
int power(int base, int powerRaised)
{
if (powerRaised != 0)
return (base*power(base, powerRaised-1));
else
return 1;
}
Output

31. https://www.facebook.com/fcoursesbd Page 31 of 31
-: THE END :-