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The following C function computes and prints the prime decomposition of the integer received as argument in the function call.
/* * Description: * Computes the prime factorization of an integer * Parameters: * n - the integer to be factorized */ void Factorization(int n) { int d = 2, pow = 0; printf("\n\tInteger factorization of %d: ",n); //the number to be factorized n is greater than 1 and //the current integer to be tested as a prime factor d is lower than n while(n > 1) { pow = 0; //while d is a valid prime factor while(n%d == 0) { pow++;//counting the number of times d divides n n /= d; } if(pow != 0)//if d divides n at least once { printf("%d",d);//printing d if(pow != 1)//if d divides n more than once { printf("^%d",pow);//printing the power of d } printf("*"); } d++; } printf("\b "); }Example:
This C program reads a number from keyboard and, using the function defined above, prints the number's prime factorization.
#include<stdio.h> #include<conio.h> void Factorization(int n); int main(void) { int n = 0; printf("\n Enter the number to be factorized: "); scanf("%d",&n); Factorization(n); getch(); return 0; }
Output:
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