Loop Exercises
Write a C program to input a number from user and find all factors of the given number using for loop. How to find factors of a number in C program. Logic to find all factors of a given number in C programming.
Required knowledge
Basic C programming, If else, For loop
What is factor of a number?
Factor of any number is a whole number which exactly divides the number into a whole number without leaving any remainder. For example: 2 is a factor of 6 because 2 divides 6 exactly leaving no remainder.
Logic to find all factors of a number
Step by step descriptive logic to find all factors of a number.
- Input number from user. Store it in some variable say num.
- Run a loop from 1 to num, increment 1 in each iteration. The loop structure should look like for(i=1; i<=num; i++).
- For each iteration inside loop check current counter loop variable i is a factor of num or not. To check factor we check divisibility of number by performing modulo division i.e. if(num % i == 0) then i is a factor of num.
If i is a factor of num then print the value of i.
Program to find factors of any number
/** * C program to print all factors of a number */ #include <stdio.h> int main() { int i, num; /* Input number from user */ printf("Enter any number to find its factor: "); scanf("%d", &num); printf("All factors of %d are: \n", num); /* Iterate from 1 to num */ for(i=1; i<=num; i++) { /* * If num is exactly divisible by i * Then i is a factor of num */ if(num % i == 0) { printf("%d, ",i); } } return 0; }
Output
Enter any number to find its factors: 100
All factors of 100 are:
1, 2, 4, 5, 10, 20, 25, 50, 100,