In this C program, we will find all factors of a given number.

A number N is a factor of number M, if and only if N divides M completely leaving no remainder(M % N = 0). For example, 4 is a factor of 40 because 4 divides 40 without leaving any remainder.

40 / 4 = 10. and 40 % 4 = 0;

Here is the list of all factors of 40 : 1 2 4 5 8 10 20 40

#### Required Knowledge

**Algorithm to find all factors of a number N**

*Check with every number from 1 to N, whether it divides N completely or not.*

Let, i be any number between 1 to N

Let, i be any number between 1 to N

- If(N % i == 0), then i is a factor of N
- If(N % i != 0), then i is not a factor of N

## C program to find all factors of a number using for loop

#include <stdio.h> int main() { int counter, N; printf("Enter a Number\n"); scanf("%d", &N); printf("Factors of %d\n", N); for(counter = 1; counter <= N; counter++) { if(N%counter == 0) { printf("%d ", counter); } } return 0; }Output

Enter a Number 40 Factors of 40 1 2 4 5 8 10 20 40

Enter a Number 37 Factors of 37 1 37

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