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C Program to Check Prime Number Using Efficient Logic

  Introduction A prime number is a number that has exactly two distinct positive divisors: 1 and itself. In this program, we check whether a given number is prime or not using a simple and efficient logic. This type of program is commonly used in mathematics, competitive programming, and basic algorithm learning for beginners in C programming. Problem Statement The task is to write a C program that determines whether a given integer is a prime number or not. The program takes a single integer input from the user and analyzes its divisibility. If the number has no divisors other than 1 and itself, it should be identified as a prime number; otherwise, it is not prime. This problem is important in number theory and has practical relevance in areas such as cryptography, data validation, and algorithm design.  Algorithm / Logic Explanation To check whether a number is prime, we need to verify that it is not divisible by any number other than 1 and itself. The algorithm follows a si...
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typedef Examples in C

typedef Examples in C

✅ Typedef Examples in C

1. Typedef with Pointers

#include <stdio.h>

typedef int* IntPtr;

int main() {
    int a = 100;
    IntPtr p = &a;  // same as int *p = &a;
    printf("Value at pointer: %d\n", *p);
    return 0;
}

2. Function Pointer with Typedef

#include <stdio.h>

typedef void (*FuncPtr)(int);

void greet(int x) {
    printf("Hello %d times!\n", x);
}

int main() {
    FuncPtr fp = greet;
    fp(3);
    return 0;
}

3. Typedef with Enum

#include <stdio.h>

typedef enum {
    RED, GREEN, BLUE
} Color;

int main() {
    Color c = GREEN;
    printf("Color value: %d\n", c);
    return 0;
}

4. Enum without Typedef

enum Color { RED, GREEN, BLUE };
enum Color c = RED;

5. Typedef with Structure

#include <stdio.h>

typedef struct {
    int x, y;
} Point;

int main() {
    Point p1 = {10, 20};
    printf("x = %d, y = %d\n", p1.x, p1.y);
    return 0;
}

6. Structure Without Typedef

struct Point {
    int x, y;
};

int main() {
    struct Point p = {10, 20};
}

7. Another Typedef Struct Example

#include <stdio.h>

typedef struct {
    int x, y;
} point;

int main() {
    point p;
    p.x = 3;
    p.y = 5;
    printf("%d and %d", p.x, p.y);
}

8. Typedef with Unsigned Int

#include <stdio.h>

typedef unsigned int unit;

int main() {
    unit a = 0;
    printf("The value of a is: %u", a);
}
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