Add One to Number Represented by Array In C

January 03, 2026

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...

➕ Add One to Number Represented by Array

#include <stdio.h> int main() { int size; // printf("Enter a array size: "); scanf("%d", &size); int a[size]; // printf("Enter a array elements: "); for (int i = 0; i < size; i++) { scanf("%d", &a[i]); } int num = 0; for (int i = 0; i < size; i++) { num = num * 10 + a[i]; } num += 1; printf("\nNumber after adding 1: %d\n", num); int temp = num; int result[10]; int index = 0; while (temp > 0) { result[index++] = temp % 10; temp /= 10; } printf("Result in array: "); for (int i = index - 1; i >= 0; i--) { printf("%d ", result[i]); } printf("\n"); return 0; }

📘 Explanation:

🔹 This program reads digits of a number into an array.
🔹 Combines those digits to form the actual number using positional multiplication.
🔹 Adds 1 to the number.
🔹 Breaks the result back into digits and stores them in another array.
🔹 Finally, it prints the updated digits from the result array.

🧪 Sample Output:

Input:
5
1 2 3 4 5

Output:
Number after adding 1: 12346
Result in array: 1 2 3 4 6

🏷️ Keywords:

add one to number in array, C program number to array, digit manipulation in C, array math in C, convert array to integer, beginner C array program

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C Program to Check Prime Number Using Efficient Logic