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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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Student Records Using Structure Array in C

Student Records Using Structure Array in C

✅ Student Records Using Structure Array in C

#include <stdio.h>

struct student {
    char name[50];
    int roll;
    float marks;
};

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

    struct student s[n];  // Array of structs

    // Input Section
    for(int i = 0; i < n; i++) {
        printf("\n=== ENTER DETAILS OF STUDENT %d ===\n", i + 1);
        printf("Name: ");
        scanf(" %[^\n]", s[i].name);  // Accepts spaces

        printf("Roll Number: ");
        scanf("%d", &s[i].roll);

        printf("Marks: ");
        scanf("%f", &s[i].marks);
    }

    // Output Section
    printf("\n=== STUDENT DETAILS ===\n");
    for(int i = 0; i < n; i++) {
        printf("\nStudent %d\n", i + 1);
        printf("Name       : %s\n", s[i].name);
        printf("Roll Number: %d\n", s[i].roll);
        printf("Marks      : %.2f\n", s[i].marks);
    }

    return 0;
}

📘 Explanation:

This C program uses an array of structures to store details of multiple students. The structure student has fields for name, roll number, and marks. The program prompts the user for the number of students, then collects their data using a loop, and finally prints all the stored data. Useful in managing records in a structured format.

🧾 Sample Output:

Enter number of students: 2

=== ENTER DETAILS OF STUDENT 1 ===
Name: Naveen Kumar
Roll Number: 101
Marks: 85.5

=== ENTER DETAILS OF STUDENT 2 ===
Name: Ravi Teja
Roll Number: 102
Marks: 91

=== STUDENT DETAILS ===

Student 1
Name       : Naveen Kumar
Roll Number: 101
Marks      : 85.50

Student 2
Name       : Ravi Teja
Roll Number: 102
Marks      : 91.00

🔑 Keywords:

Structure Array in C, C Student Record Program, Array of Structures, Student Information Storage in C, struct keyword in C, C Programming for Beginners

📌 Hashtags:

#CProgramming #StructuresInC #StudentRecord #ArrayOfStructures #BeginnerCProgram #CollegeAssignment #LearnCProgramming

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