commit b693e554e75822fc0c46be6eb180af16b031a515
parent 098b0287d3cad4997be43a1ddacaebc745804721
Author: Amit Dutta <amitdutta4255@gmail.com>
Date: Mon, 27 Oct 2025 21:40:45 +0530
new p-28102025
Diffstat:
7 files changed, 288 insertions(+), 0 deletions(-)
diff --git a/tuition-c/P038.c b/tuition-c/P038.c
@@ -0,0 +1,56 @@
+/* Write a program to check prime number */
+/* Author - Amit Dutta, Date - 27th OCT, 2025 */
+
+#include <stdio.h>
+#include <math.h>
+#include <stdbool.h>
+
+int main()
+{
+ int num, i, endCheckDigit;
+ bool isPrime = true;
+ printf("Enter the number : ");
+ if (scanf("%d", &num) != 1)
+ {
+ printf("\nOnly a number is allowed, not a character.");
+ return 1;
+ }
+ if (num <= 0)
+ {
+ printf("\nOnly postive number is allowed.");
+ return 1;
+ }
+ if (num == 1)
+ {
+ printf("\nInput 1 is not a prime number."
+ "\nHas only one positive divisor (itself), not exactly two."
+ "\nRule: Prime number should have exactly two distinct positive divisors: 1 and itself");
+ return 0;
+ }
+ if (num == 2)
+ {
+ printf("\nInput 2 is a prime number."
+ "\n(Note: 2 is only Even Prime Number)");
+ return 0;
+ }
+ if (num % 2 == 0)
+ {
+ printf("\nInput %d is not a prime number.", num);
+ return 0;
+ }
+ endCheckDigit = sqrt(num);
+ for (i = 3; i <= endCheckDigit; i += 2)
+ {
+ if (num % i == 0)
+ {
+ isPrime = false;
+ printf("\nInput %d is not prime number.", num);
+ return 0;
+ }
+ }
+ if (isPrime)
+ {
+ printf("\nInput %d is a prime number.", num);
+ }
+ return 0;
+}+
\ No newline at end of file
diff --git a/tuition-c/P039.c b/tuition-c/P039.c
@@ -0,0 +1,20 @@
+/* Write a program to print all the factors of a postive integer */
+/* Author - Amit Dutta, Date - 27th OCT, 2025 */
+
+#include <stdio.h>
+
+int main()
+{
+ int num, i;
+ printf("Enter a number : ");
+ scanf("%d", &num);
+ printf("\nFactors of %d : ", num);
+ for (i = 1; i <= num / 2; i++)
+ {
+ if (num % i == 0)
+ {
+ printf(" %d", i);
+ }
+ }
+ return 0;
+}+
\ No newline at end of file
diff --git a/tuition-c/P040.c b/tuition-c/P040.c
@@ -0,0 +1,18 @@
+/* Write a program to calculate HCF of two positive number */
+/* Author - Amit Dutta, Date - 27th OCT, 2025 */
+
+#include <stdio.h>
+int main()
+{
+ int a, b, temp;
+ printf("Enter two number : ");
+ scanf("%d %d", &a, &b);
+ while (b > 0)
+ {
+ temp = a;
+ a = b;
+ b = temp % b;
+ }
+ printf("HCF = %d", a);
+ return 0;
+}+
\ No newline at end of file
diff --git a/tuition-c/P041.c b/tuition-c/P041.c
@@ -0,0 +1,29 @@
+/* Write a program to enter two numbers and check they are co-prime or not.
+ co-prime when HCF = 1
+*/
+/* Author - Amit Dutta, Date - 27th OCT, 2025 */
+
+#include <stdio.h>
+int main()
+{
+ int a, b, temp, temp_a, temp_b;
+ printf("Enter two number : ");
+ scanf("%d %d", &a, &b);
+ temp_a = a;
+ temp_b = b;
+ while (b > 0)
+ {
+ temp = a;
+ a = b;
+ b = temp % b;
+ }
+ if (a == 1)
+ {
+ printf("\n(%d, %d) is co-prime.", temp_a, temp_b);
+ }
+ else
+ {
+ printf("\n(%d, %d) is not co-prime.", temp_a, temp_b);
+ }
+ return 0;
+}+
\ No newline at end of file
diff --git a/tuition-c/P042.c b/tuition-c/P042.c
@@ -0,0 +1,55 @@
+/* Write a program to accept a number and check whether the number
+is twisted prime or not. */
+/* Author - Amit Dutta, Date - 27th OCT, 2025 */
+
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+ int n, t, i, r, rev, prime = 1;
+ printf("Enter the number : ");
+ scanf("%d", &n);
+ for (i = 2; i <= (int)sqrt(n); i++)
+ {
+ if (n % i == 0)
+ {
+ prime = 0;
+ break;
+ }
+ }
+ if (prime)
+ {
+ printf("%d is a prime number.", n);
+ t = n;
+ rev = 0;
+ prime = 1;
+ while (t > 0)
+ {
+ r = t % 10;
+ rev = rev * 10 + r;
+ t = t / 10;
+ }
+ for (i = 2; i <= (int)sqrt(rev); i++)
+ {
+ if (rev % i == 0)
+ {
+ prime = 0;
+ break;
+ }
+ }
+ if (prime)
+ {
+ printf("\n%d and %d are prime numbers.. TWISTED PRIME", n, rev);
+ }
+ else
+ {
+ printf("\n%d is non prime", rev);
+ }
+ }
+ else
+ {
+ printf("\n%d is non prime.", n);
+ }
+ return 0;
+}+
\ No newline at end of file
diff --git a/tuition-c/P043.c b/tuition-c/P043.c
@@ -0,0 +1,26 @@
+/* Write a program to check palindrome number. */
+/* Author - Amit Dutta, Date - 27th OCT, 2025 */
+
+#include <stdio.h>
+int main()
+{
+ int num, temp, rev;
+ printf("Enter the number : ");
+ scanf("%d", &num);
+ temp = num;
+ rev = 0;
+ while (temp > 0)
+ {
+ rev = (rev * 10) + (temp % 10);
+ temp /= 10;
+ }
+ if (num == rev)
+ {
+ printf("%d is a palindrome number.", num);
+ }
+ else
+ {
+ printf("%d is not a palindrome number.", num);
+ }
+ return 0;
+}+
\ No newline at end of file
diff --git a/tuition-c/P044.c b/tuition-c/P044.c
@@ -0,0 +1,77 @@
+/* Write a program to input a number and check whether the
+number is Pronic number or not.
+ Pronic Number: The number which is the product of two numbers
+ which is the product of two consecutive integer.
+ Ex: 20 = 4 * 5
+*/
+/* Author - Amit Dutta, Date - 27th OCT, 2025 */
+
+// using boolean...
+/*
+#include <stdio.h>
+#include <math.h>
+#include <stdbool.h>
+
+int main()
+{
+ int num, iterationIndex;
+ bool isPronic = false;
+ printf("Enter the number : ");
+ if (scanf("%d", &num) != 1)
+ {
+ printf("\nYou have to enter a number, not an character or symbol.");
+ return 1;
+ }
+ if (num < 1)
+ {
+ printf("\nOnly postive number is allowed.");
+ return 1;
+ }
+ for (iterationIndex = 1; iterationIndex <= num / 2; iterationIndex++)
+ {
+ if (iterationIndex * (iterationIndex + 1) == num)
+ {
+ printf("\nInput %d is a Pronic Number.", num);
+ isPronic = true;
+ break;
+ }
+ }
+ if(!isPronic)
+ {
+ printf("\nInput %d is not a Pronic Number.", num);
+ }
+ return 0;
+}
+*/
+
+// using direct return method (more efficient and generally preferred)...
+
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+ int num, iterationIndex, iterationLimit;
+ printf("Enter the number : ");
+ if (scanf("%d", &num) != 1)
+ {
+ printf("\nYou have to enter a number, not an character or symbol.");
+ return 1;
+ }
+ if (num < 1)
+ {
+ printf("\nOnly postive number is allowed.");
+ return 1;
+ }
+ iterationLimit = (int)sqrt(num);
+ for (iterationIndex = 1; iterationIndex <= iterationLimit; iterationIndex++)
+ {
+ if (iterationIndex * (iterationIndex + 1) == num)
+ {
+ printf("\nInput %d is a Pronic Number.", num);
+ return 0;
+ }
+ }
+ printf("\nInput %d is not a Pronic Number.", num);
+ return 0;
+}+
\ No newline at end of file
