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判断素数.cpp

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+#include <stdlib.h>
+#include <stdio.h>
+# include<math.h>
+void is_prime(int n)
+{
+ int i = 2;   
+ while (i <= sqrt(n))
+ {
+  if (n%i == 0)
+  {
+   printf("\n %d\n", n);
+   break;  
+  }
+  i++;
+ }
+ if(i > sqrt(n))
+    printf("\n %d\n", n);
+}
+int main()
+{
+ int a = 9;
+
+ is_prime(a);
+ return 0;
+}