some of level1

practices/c/level1/some of lvl 1

@@ -0,0 +1,104 @@
+#include<stdio.h>
+int main()
+{
+	int a,i,b;
+	b=0;
+	printf("请输入一个数：");
+	scanf("%d",&a);
+	for(i=2;i<a;i++)
+	{
+
+		if(a%i!=0)
+		b++;
+	}
+	if(b==a-2)
+	printf("a为素数"); 
+	else
+	printf("a不为素数");
+}
+
+
+
+#include<stdio.h>
+int main()
+{
+	int life,tn,qn,ds,son;
+	printf("年龄可能为：");
+    for(life=1;life++;life<=100)
+    {
+    	tn=life/6;
+    	qn=life/12;
+    	ds=life/7;
+    	son=life/2;
+    	if(life==tn+qn+ds+5+son+4&&life%84==0)
+    	printf("%d",life);
+	}
+}
+
+
+
+#include<stdio.h>
+int main()
+{
+	int shuixianhua,bai,shi,ge;
+	printf("水仙花数有：");
+	for(shuixianhua=100;shuixianhua<1000;shuixianhua++)
+	{
+		bai=shuixianhua/100;
+		shi=(shuixianhua-100*bai)/10;
+		ge=shuixianhua%10;
+		if(shuixianhua==ge*ge*ge+shi*shi*shi+bai*bai*bai)
+		printf("%d\t",shuixianhua);
+	}
+}
+
+
+
+#include<stdio.h>
+int main()
+{
+	int a,b,c;
+	printf("2到1000素数有：2\t");
+	for(a=3;a<=1000;a++)
+	{
+		c=0;
+		for(b=2;b<a;b++)
+		{
+			if(a%b!=0)
+			c++;
+		}
+		if(c==a-2)
+		printf("%d\t",a);
+	}
+}
+
+
+
+#include<stdio.h>
+int sushu(int a)
+{
+	int b, c=0;
+	for(b=2;b<a;b++)
+	{
+	    if(a%b!=0)
+	    c++;
+	}
+	if(c==a-2)
+	return 1;
+	else
+	return 0;
+}
+
+int main()
+{
+	int i,j;
+	for(i=4;i<=100;i+=2)
+	{
+		for(j=2;j<=i/2;j++)
+		{
+			if(sushu(j)&&sushu(i-j))
+			printf("%d=%d+%d\t",i,j,i-j);
+		}
+	}
+	return 0;
+}