Pointer ~ Coding with Suman Adhikari(C)

Pointer

Fundamental About Pointer
#include <stdio.h>
#include <stdlib.h>
int main() {
int ptr, n, i;
printf("Enter number of elements: ");
scanf("%d", &n);
ptr = malloc(n sizeof(int)); // No need for (int ) as it's implicit
if (!ptr) return 1; // Checks if malloc fails

printf("Enter the values:\n");
for (i = 0; i < n; i++) {
scanf("%d", &ptr[i]);
}

printf("Values entered are:\n");
for (i = 0; i < n; i++) {
printf("%d ", ptr[i]);
}

free(ptr); // Free the dynamically allocated memory
return 0;
}

Write a program to accept two number and sort them with using pointer.
#include <stdio.h>

// Function to sort two numbers using pointers
void sortNumbers(int ptr1, int ptr2) {
if (ptr1 > ptr2) {
// Swap values using pointers
int temp = ptr1;
ptr1 = ptr2;
ptr2 = temp;
}
}

int main() {
int num1, num2;

// Input two numbers from user
printf("Enter first number: ");
scanf("%d", &num1);
printf("Enter second number: ");
scanf("%d", &num2);

// Call function to sort numbers
sortNumbers(&num1, &num2);

// Print sorted numbers
printf("Sorted numbers: %d %d\n", num1, num2);

return 0;
}

Write a function that receive marks received by a student in subjects and return the average and percentage of these marks call this function form main() and print the results in main().
#include <stdio.h>

// Function to calculate average and percentage of marks
void calculateMarks(int marks[], int n, double average, double percentage) {
int total_marks = 0;

// Calculate total marks
for (int i = 0; i < n; ++i) {
total_marks += marks[i];
}

// Calculate average
average = (double)total_marks / n;

// Calculate percentage
percentage = ((double)total_marks / (n 100)) * 100;
}

int main() {
int n;
printf("Enter number of subjects: ");
scanf("%d", &n);

int marks[n];

// Input marks from user
printf("Enter marks for %d subjects:\n", n);
for (int i = 0; i < n; ++i) {
printf("Enter marks for subject %d: ", i + 1);
scanf("%d", &marks[i]);
}

double average, percentage;

// Call function to calculate average and percentage
calculateMarks(marks, n, &average, &percentage);

// Print results
printf("\nResults:\n");
printf("Average marks: %.2f\n", average);
printf("Percentage: %.2f%%\n", percentage);

return 0;
}

Write a function that receives 5 integers and return the sum, average and stand deviation of these numbers. Call this function form main() and print the result in main().
#include <stdio.h>
#include <math.h> // Include math.h for sqrt() function

// Function to calculate sum, average, and standard deviation
void calculateStats(int arr[], int n, int sum, double avg, double std_dev) {
// Calculate sum
sum = 0;
for (int i = 0; i < n; ++i) {
sum += arr[i];
}

// Calculate average
avg = (double)(sum) / n;

// Calculate standard deviation
double sum_of_squares = 0.0;
for (int i = 0; i < n; ++i) {
sum_of_squares += (arr[i] - avg) * (arr[i] - avg);
}
std_dev = sqrt(sum_of_squares / n);
}

int main() {
int numbers[5];
int sum;
double average, standard_deviation;

// Input 5 integers from user
printf("Enter 5 integers:\n");
for (int i = 0; i < 5; ++i) {
printf("Enter integer %d: ", i + 1);
scanf("%d", &numbers[i]);
}

// Call function to calculate sum, average, and standard deviation
calculateStats(numbers, 5, &sum, &average, &standard_deviation);

// Print results
printf("\nResults:\n");
printf("Sum: %d\n", sum);
printf("Average: %.2f\n", average);
printf("Standard Deviation: %.2f\n", standard_deviation);

return 0;
}

Write a C function to evaluate the series.
sin(x)=x-(x^3/3!)+(x^5/5!)-(x^7/7!)+..
up to 10 terms.
#include <stdio.h>
#include <math.h> // Include math.h for pow() function

// Function to calculate factorial
unsigned long long factorial(int n) {
if (n == 0 || n == 1) {
return 1;
} else {
unsigned long long fact = 1;
for (int i = 2; i <= n; ++i) {
fact = i;
}
return fact;
}
}

// Function to evaluate sine function using Taylor series up to 10 terms
double sineSeries(double x) {
double result = 0.0;
int sign = 1;

// Calculate series up to 10 terms
for (int i = 0; i < 10; ++i) {
int exponent = 2 i + 1;
double term = sign * pow(x, exponent) / factorial(exponent);
result += term;
sign = -sign; // Alternate sign for next term
}

return result;
}

int main() {
double x;

// Input value of x (in radians)
printf("Enter the value of x (in radians): ");
scanf("%lf", &x);

// Evaluate sine using the function
double result = sineSeries(x);

// Output the result
printf("sin(%.2f) = %.6f\n", x, result);

return 0;
}

Given Three Variables x,y,z write a function to circularly shift their value to right. In other words if x=5, y=8, z=10, after circular shift y=5, z=8, x=10. Call the function with variable a,b,c to circularly shift value.
#include <stdio.h>

// Function to circularly shift values to the right
void circularShiftRight(int x, int y, int z) {
int temp = z;
z = y;
y = x;
x = temp;
}

int main() {
int a = 5, b = 8, c = 10;

// Print initial values
printf("Before circular shift:\n");
printf("a = %d, b = %d, c = %d\n", a, b, c);

// Perform circular shift
circularShiftRight(&a, &b, &c);

// Print shifted values
printf("After circular shift:\n");
printf("a = %d, b = %d, c = %d\n", a, b, c);

return 0;
}

Write a program to find the sum of all the elements of an array using pointers.
#include <stdio.h>

int main() {
int arr[] = {1, 2, 3, 4, 5};
int ptr = arr; // Pointer to the first element of the array
int sum = 0;

// Iterate through the array using the pointer and calculate the sum
while (ptr) {
sum += ptr;
ptr++; // Move the pointer to the next element
}

// Print the sum
printf("Sum of array elements: %d\n", sum);

return 0;
}

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