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diff --git a/2207/天天乐学答案/C语言/C语言（三）/combined.md b/2207/天天乐学答案/C语言/C语言（三）/combined.md
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@@ -0,0 +1,657 @@
+### C����-1
+```c
+/*-------------------------------------------------------
+��������һ�����ڣ�������һ������һ���еĵڼ��죨���������ƽ�꣩��
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int y,m,d,s,f;
+	s=0;
+	printf("������һ�����ڣ�YYYY-MM-DD����");
+	scanf("%d-%d-%d",&y,&m,&d);
+	if(y%4==0&&y%100!=0||y%400==0)
+		f=1;
+	else
+		f=0;
+	switch(m-1)
+	{
+/**********Program**********/
+		case 11: s+=30;
+		case 10: s+=31;
+		case 9: s+=30;
+		case 8: s+=31;
+		case 7: s+=31;
+		case 6: s+=30;
+		case 5: s+=31;
+		case 4: s+=30;
+		case 3: s+=31;
+		case 2: s+=f+28;
+		case 1: s+=31;
+/**********  End  **********/	
+	}
+	s=s+d ;
+	printf("%d-%d-%d����һ���еĵ�%d��\n",y,m,d,s);
+}
+
+```
+
+### C����-2
+```c
+/*-------------------------------------------------------
+�����s=a+aa+aaa+aaaa+aa��a��ֵ������aΪһ�����֣�����3+33+333+3333+33333��Ҫ��a�Լ��������ָ���n�ɼ�������,ʾ����a=3,n=5����ע��ʹ��for��
+ -------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int a,n,s,i,t;
+	s=t=0;
+	printf("����������a:");
+	scanf("%d",&a);
+	printf("��������͵�����n:");
+	scanf("%d",&n);
+/**********Program**********/
+	t = a;
+	for(i=0;i<n;i++){
+		s += t;
+		t*=10;
+		t+=a;
+	}
+/**********  End  **********/	
+	printf("s=%d\n",s);
+
+}
+
+```
+
+### C����-3
+```c
+/*-------------------------------------------------------
+�Ӽ�������һ��ʮ��������������ת��Ϊ�����ƺ�����ת���µ�ʮ���ƺ������������11��1011��1101��13����ע��ʹ��whileѭ����
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int n,s,t;
+	s=0;
+	printf("������һ��������");
+	scanf("%d",&n);
+/**********Program**********/
+	//1011 ����ĩβ��ʼ ���γ���
+	//����s֮ǰ��ǰ�������*1 
+	while(n){
+		s += s + n%2;
+		n /= 2;
+	}
+/**********  End  **********/	
+	printf("%d\n",s);
+
+}
+```
+
+### C����-4
+```c
+/*-------------------------------------------------------
+����ж�m�Ƿ�����,m�ɼ������롣(ʹ��for��
+-------------------------------------------------------*/
+#include <stdio.h>
+#include <math.h>
+main()
+{
+	int m,i,k;
+	printf("������һ�������� :");
+	scanf("%d",&m);
+	k=sqrt(m);
+/**********Program**********/
+	for(i=2;i<=k;i++){
+		if(m % i == 0){
+			break;
+		}
+	}
+/**********  End  **********/	
+	if(i>k)
+		printf("%d������\n",m);
+	else
+		printf("%d��������\n",m);
+}
+```
+
+### C����-5
+```c
+/*-------------------------------------------------------
+����ж�m�Ƿ�����,m�ɼ������롣(ʹ��forѭ����
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int m,i;
+	printf("������һ�������� :");
+	scanf("%d",&m);
+/**********Program**********/
+	for(i=2;i<m;i++){
+		if(m%i==0){
+			break;
+		}
+	}
+/**********  End  **********/	
+	if(i==m)
+		printf("%d������\n",m);
+	else
+		printf("%d��������\n",m);
+}
+
+```
+
+### C����-6
+```c
+/*-------------------------------------------------------
+ʹ��forѭ�����99�˷�����Ҫ���ʽ��ͼ��ʾ: ��ע���˻�ռ�ĸ��ַ���
+1x1=1
+2x1=2   2x2=4
+3x1=3   3x2=6   3x3=9
+4x1=4   4x2=8   4x3=12  4x4=16
+5x1=5   5x2=10  5x3=15  5x4=20  5x5=25
+6x1=6   6x2=12  6x3=18  6x4=24  6x5=30  6x6=36
+7x1=7   7x2=14  7x3=21  7x4=28  7x5=35  7x6=42  7x7=49
+8x1=8   8x2=16  8x3=24  8x4=32  8x5=40  8x6=48  8x7=56  8x8=64
+9x1=9   9x2=18  9x3=27  9x4=36  9x5=45  9x6=54  9x7=63  9x8=72  9x9=81
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i,j;
+/**********Program**********/
+	for(i=1;i<10;i++){
+		for(j=1;j<=i;j++){
+			printf("%dx%d=%-4d", i, j, i*j);
+		}
+		printf("\n");
+	}
+
+
+
+
+/**********  End  **********/	
+
+}
+```
+
+### C����-7
+```c
+/*-------------------------------------------------------
+�Ӽ�������5����������������ֵ����Сֵ��ƽ��ֵ��(ע��ʹ��forѭ����
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int n,s,max,min,i;
+	double avg;
+	scanf("%d",&n);
+	s=max=min=n;
+        for(i=2;i<=5;i++)
+	{
+	    scanf("%d",&n);
+/**********Program**********/
+		if(n > max){
+			max = n;
+		}
+		if(n < min){
+			min = n;
+		}
+		s+=n;
+
+
+/**********  End  **********/	
+        }
+	avg=s/5.0;
+	printf("max=%d,min=%d,avg=%f\n",max,min,avg);
+
+}
+```
+
+### C����-8
+```c
+/*------------------------------------------------------- 
+��д��������ӹ�Ԫ2000����3000�������������ţ�ÿ���10����Ż�һ�С�
+ -------------------------------------------------------*/ 
+#include <stdio.h> 
+main() 
+{  
+    int year,count; 
+    count=0;  
+    for(year=2000;year<=3000;year++)  
+	 { 
+             if(year%4==0&&year%100!=0 || year%400==0) {
+	     printf("%-6d",year); 
+/**********Program**********/
+			count++;
+			if(count%10==0){
+				printf("\n");
+			 }
+		} 
+/**********  End  **********/	  
+	} 
+} 
+
+
+```
+
+### C����-9
+```c
+/*-------------------------------------------------------
+����һ�������գ�Ҫ�������һ���Ǹ���ĵڼ��졣�����磺2000��3��2���Ǹ���ĵ�62�죩
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i, year,month,day,days;
+	days=0;
+	printf("������һ�����ڣ���ʽΪ��yyyy-mm-dd����");
+	scanf("%d-%d-%d",&year,&month,&day);
+	for(i=1;i<month;i++)
+	{
+		switch(i)
+		{
+/**********Program**********/
+		case 1:
+		case 3:
+		case 5:
+		case 7:
+		case 8:
+		case 10:days+=31;break;
+		case 2: days+=28;days += (year%4==0&&year%100!=0||year%400==0)?1:0;break;
+		default:
+			days+=30;
+/**********  End  **********/		}
+	}
+	days=days+day;
+	printf("%d-%d-%d����һ���еĵ�%d��\n",year,month,day,days);
+
+}
+
+```
+
+### C����-10
+```c
+/*-------------------------------------------------------
+��ǰ100�����������ʱÿ����ռ5���ַ����ȣ�10��һ��,�������ƽ��ֵ��
+�����
+    2    3    5    7   11   13   17   19   23   29
+   31   37   41   43   47   53   59   61   67   71
+   73   79   83   89   97  101  103  107  109  113
+  127  131  137  139  149  151  157  163  167  173
+  179  181  191  193  197  199  211  223  227  229
+  233  239  241  251  257  263  269  271  277  281
+  283  293  307  311  313  317  331  337  347  349
+  353  359  367  373  379  383  389  397  401  409
+  419  421  431  433  439  443  449  457  461  463
+  467  479  487  491  499  503  509  521  523  541
+
+average=241.330000
+-------------------------------------------------------*/
+#include <stdio.h>
+#include <math.h>
+main()
+{
+	int i,j,k,m,sum;
+	double avg;
+	k=0;
+	sum=0;
+	for(i=2;k<100;i++)
+	{
+		m=sqrt(i);
+/**********Program**********/
+		for(j=2;j<=m;j++){
+			if(i%j==0){
+				break;
+			}
+		}
+		if(j>m){
+			printf("%5d", i);
+			k++;
+			sum+=i;
+			if(k%10==0){
+				printf("\n");
+			}
+		}
+
+
+/**********  End  **********/		
+	}
+	avg=sum/100.0;
+	printf("\naverage=%f\n",avg);
+}
+
+```
+
+### C����-11
+```c
+/*-------------------------------------------------------
+��100��200����������������ʱÿ����ռ5���ַ����ȣ�10��һ�С�Ҫ������������������
+�����
+ 101  103  107  109  113  127  131  137  139  149
+ 151  157  163  167  173  179  181  191  193  197
+ 199
+-------------------------------------------------------*/
+#include <stdio.h>
+#include <math.h>
+main()
+{
+	int i,j,k,m;
+	k=0;
+	for(i=101;i<200;i+=2  )
+	{
+		m=sqrt(i);
+/**********Program**********/
+		for(j=2;j<=m;j++){
+			if(i%j==0){
+				break;
+			}
+		}
+		if(j > m){
+			printf("%5d", i);
+			k++;
+			if(k%10==0){
+				printf("\n");
+			}
+		}
+/**********  End  **********/		
+	}
+}
+```
+
+### C����-12
+```c
+/*-------------------------------------------------------
+ʹ��forѭ�����99�˷�����Ҫ���ʽ��ͼ��ʾ: ��ע���˻�ռ�ĸ��ַ���
+1x1=1   1x2=2   1x3=3   1x4=4   1x5=5   1x6=6   1x7=7   1x8=8   1x9=9
+2x1=2   2x2=4   2x3=6   2x4=8   2x5=10  2x6=12  2x7=14  2x8=16  2x9=18
+3x1=3   3x2=6   3x3=9   3x4=12  3x5=15  3x6=18  3x7=21  3x8=24  3x9=27
+4x1=4   4x2=8   4x3=12  4x4=16  4x5=20  4x6=24  4x7=28  4x8=32  4x9=36
+5x1=5   5x2=10  5x3=15  5x4=20  5x5=25  5x6=30  5x7=35  5x8=40  5x9=45
+6x1=6   6x2=12  6x3=18  6x4=24  6x5=30  6x6=36  6x7=42  6x8=48  6x9=54
+7x1=7   7x2=14  7x3=21  7x4=28  7x5=35  7x6=42  7x7=49  7x8=56  7x9=63
+8x1=8   8x2=16  8x3=24  8x4=32  8x5=40  8x6=48  8x7=56  8x8=64  8x9=72
+9x1=9   9x2=18  9x3=27  9x4=36  9x5=45  9x6=54  9x7=63  9x8=72  9x9=81
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i,j;
+/**********Program**********/
+	for(i=1;i<10;i++){
+		for(j=1;j<10;j++){
+			printf("%dx%d=%-4d", i, j, i*j);
+		}
+		printf("\n");
+	}
+
+
+
+
+/**********  End  **********/	
+
+}
+
+```
+
+### C����-13
+```c
+/*------------------------------------------------------- 
+��д�����ӡһ��n�е����Σ�n�ɼ������� 
+���룺5
+�����
+  *
+ ***
+*****
+ ***
+  *  
+-----------------------------------------------------*/  
+#include <stdio.h> 
+#include <math.h> 
+main() 
+{  
+   int i,j,k,n;  
+   printf("������һ������(����)n:");
+   scanf("%d",&n);     
+   for(i=-n/2; i<=n/2;i++)  
+     {
+/**********Program**********/
+		 for(j=0;j<abs(i);j++){
+			printf(" ");
+		 }
+		 for(k=0;k<n-j*2;k++){
+			printf("*");
+		 }
+		 printf("\n");
+/**********  End  **********/	 
+     } 
+} 
+
+```
+
+### C����-14
+```c
+/*-------------------------------------------------------
+������500���ڵġ�ˮ�ɻ���������ˮ�ɻ�������һ����λ�������λ���������͵��ڸ�������������153��13+53+33������ʹ��forѭ����
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int a,b,c,i;
+/**********Program**********/
+	for(i=100;i<500;i++){
+		a = i%10;
+		b = i%100/10;
+		c = i/100;
+
+		if(a*a*a + b*b*b + c*c*c == i)
+/**********  End  **********/	
+        printf("%d\n",i);
+	}
+}
+
+```
+
+### C����-15
+```c
+/*-------------------------------------------------------
+쳲��������е�ǰ�����ǣ�1��1��2��3��5��8��13��21���������������У�ֱ��ij���ֵ����10000Ϊֹ��ÿ�����4����
+�����
+1       1       2       3
+5       8       13      21
+34      55      89      144
+233     377     610     987
+1597    2584    4181    6765
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int a,b,c,i;
+	a=b=1;
+	printf("%d\t%d\t",a,b);
+       for(i=3;;i++)
+	{
+		c=a+b;
+		if(c>10000)
+			break;
+		printf("%d\t",c);
+/**********Program**********/
+		if(i%4==0){
+			printf("\n");
+		}
+		a = b;
+		b = c;
+	 }
+/**********  End  **********/	
+}
+```
+
+### C����-16
+```c
+/*-------------------------------------------------------
+쳲��������е�ǰ�����ǣ�1��1��2��3��5��8��13��21���������������е�ǰ20�ÿ�����4����
+�����
+1       1       2       3
+5       8       13      21
+34      55      89      144
+233     377     610     987
+1597    2584    4181    6765
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int a,b,c,i;
+	a=b=1;
+	printf("%d\t%d\t",a,b);
+            for(i=3;i<=20;i++)
+	{
+        c=a+b;
+	printf("%d\t",c);
+/**********Program**********/
+	if(i%4==0){
+		printf("\n");
+	}
+	a = b;
+	b = c;
+/**********  End  **********/	
+        }
+}
+
+```
+
+### C����-17
+```c
+/*-------------------------------------------------------
+ʹ��forѭ�����99�˷�����Ҫ���ʽ��ͼ��ʾ:��ע����ʽ  %dx%d=%-4d) 
+1x1=1   1x2=2   1x3=3   1x4=4   1x5=5   1x6=6   1x7=7   1x8=8   1x9=9
+2x1=2   2x2=4   2x3=6   2x4=8   2x5=10  2x6=12  2x7=14  2x8=16
+3x1=3   3x2=6   3x3=9   3x4=12  3x5=15  3x6=18  3x7=21
+4x1=4   4x2=8   4x3=12  4x4=16  4x5=20  4x6=24
+5x1=5   5x2=10  5x3=15  5x4=20  5x5=25
+6x1=6   6x2=12  6x3=18  6x4=24
+7x1=7   7x2=14  7x3=21
+8x1=8   8x2=16
+9x1=9
+ -------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i,j;
+/**********Program**********/
+	for(i = 1;i<10;i++){
+		for(j=1;j<=10-i;j++){
+			printf("%dx%d=%-4d", i, j, i*j);
+		}
+		printf("\n");
+	}
+
+
+/**********  End  **********/
+}
+
+```
+
+### C����-18
+```c
+/*-------------------------------------------------------
+ʹ��forѭ�����99�˷�����Ҫ���ʽ��ͼ��ʾ: 
+                                                                1x9=9
+                                                        2x8=16  2x9=18
+                                                3x7=21  3x8=24  3x9=27
+                                        4x6=24  4x7=28  4x8=32  4x9=36
+                                5x5=25  5x6=30  5x7=35  5x8=40  5x9=45
+                        6x4=24  6x5=30  6x6=36  6x7=42  6x8=48  6x9=54
+                7x3=21  7x4=28  7x5=35  7x6=42  7x7=49  7x8=56  7x9=63
+        8x2=16  8x3=24  8x4=32  8x5=40  8x6=48  8x7=56  8x8=64  8x9=72
+9x1=9   9x2=18  9x3=27  9x4=36  9x5=45  9x6=54  9x7=63  9x8=72  9x9=81
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i,j;
+        for(i=1;i<=9;i++)
+	{
+		for(j=1;j<10-i;j++)
+		{
+			printf("\t");
+		}
+/**********Program**********/
+		for(j=10-i;j<10;j++){
+			printf("%dx%d=%-4d", i, j, i*j);
+		}
+
+
+		printf("\n");
+	}
+/**********  End  **********/	
+
+}
+
+```
+
+### C����-19
+```c
+/*-------------------------------------------------------
+ʹ��forѭ�����99�˷�����Ҫ���ʽ��ͼ��ʾ: 
+1x1=1   1x2=2   1x3=3   1x4=4   1x5=5   1x6=6   1x7=7   1x8=8   1x9=9
+        2x2=4   2x3=6   2x4=8   2x5=10  2x6=12  2x7=14  2x8=16  2x9=18
+                3x3=9   3x4=12  3x5=15  3x6=18  3x7=21  3x8=24  3x9=27
+                        4x4=16  4x5=20  4x6=24  4x7=28  4x8=32  4x9=36
+                                5x5=25  5x6=30  5x7=35  5x8=40  5x9=45
+                                        6x6=36  6x7=42  6x8=48  6x9=54
+                                                7x7=49  7x8=56  7x9=63
+                                                        8x8=64  8x9=72
+                                                                9x9=81
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i,j;
+        for(i=1;i<=9;i++)
+	{
+		for(j=1;j<i;j++)
+		{
+			printf("\t");
+		}
+/**********Program**********/
+		for(j=i;j<10;j++){
+			printf("%dx%d=%-4d", i, j, i*j);
+		}
+		printf("\n");
+	}
+/**********  End  **********/	
+
+}
+```
+
+### C����-20
+```c
+/*-------------------------------------------------------
+���д�������ͼ���ij���(ע�⣺��Ҫʹ��math��abs)
+1
+123
+12345
+1234567
+12345
+123
+1
+-------------------------------------------------------*/
+#include  <stdio.h>
+#include <math.h>
+main()
+{
+	int i,j;
+	for(i=-3;i<=3;i++)
+	{		
+/**********Program**********/
+		for(j=0;j<7-abs(i)*2;j++){
+			printf("%d", j+1);
+		}
+		printf("\n");
+/**********  End  **********/	
+	}
+
+}
+```
+