Add solution for 357

problem-357.c

@@ -0,0 +1,45 @@
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "primes.h"
+
+#define	MAX_NUM	100000000
+#define	TRUE	1
+#define	FALSE	0
+
+int main(int argc, char **argv)
+{
+	int i, j, match, midpoint;
+	long sum = 0;
+	char *primes;
+
+	primes = malloc((MAX_NUM+1)*sizeof(char));
+	for (i=1; i<MAX_NUM+1; i++) {
+		if (is_prime(i)) {
+			primes[i] = TRUE;
+		} else {
+			primes[i] = FALSE;
+		}
+	}
+
+	for(i=1; i<MAX_NUM; i++) {
+		match = TRUE;
+		if (!(primes[i+1])) continue;
+
+		midpoint = (int)sqrt(i) + 1;
+		for (j=1; j<midpoint; j++) {
+			if ((!(i%j)) && (!primes[j+i/j])) {
+				match = FALSE;
+				break;
+			}
+		}
+
+		if (match) {
+			sum += i;
+		}
+	}
+
+	printf("The sum of prime-generating numbers less than %d is %ld\n", MAX_NUM, sum);
+	free(primes);
+	return 0;
+}