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素数判断.cpp

@@ -0,0 +1,24 @@
+#include<stdio.h>
+int judge(int x)
+{
+	if(x==1)
+	    return 0;
+	else
+	{
+	    for(int i=2;i<=x/i;i++)
+	        if(x%i==0)
+	            return 0;
+		return 1;		
+	}
+}
+int main()
+{
+	int x;
+	scanf("%d",&x);
+	int k=judge(x);
+	if(k)
+	    printf("Yes");
+	else
+	    printf("No");
+	return 0;
+}