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CSimple Functions ❯ List of Prime Numbers
<05.07>
/* Problem: Write a program that prints out all the prime numbers between 1 and a set limit (1000 in this example). */ #include <stdio.h> #include <math.h> #define LIMIT 1000 /* function returns true if n is even. */ /* it returns false if n is odd */ int even (int n) { return (!(n%2)); } /* function returns true if n is prime */ int prime3 (int n) { int divisor, i; /* looking for a divisor. if found, it is not a prime number */ divisor = 0; /* eliminating even numbers except 2 */ if (even (n)) { if (n==2) divisor=0; else divisor=1; } else { if (n==1) divisor=0; /* 1 is a prime number */ else /* trying to divide number by 3,5,7,... */ /* to find a divisor until sqrt(n) */ for (i=3; i<=sqrt(n); i=i+2) { if (!(n%i)) divisor=i; } } /* if there is a divisor then NOT prime */ return (!divisor); } /* This main program prints all prime numbers between 1 and the set limit */ int main (void) { int x; for (x=1; x<=LIMIT; ++x) if (prime3 (x)) printf (" %d ", x); return (0); }
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