diff --git a/2207/天天乐学答案/C语言/C语言（二）/combine_c_files.sh b/2207/天天乐学答案/C语言/C语言（二）/combine_c_files.sh
new file mode 100755
index 0000000..4120896
--- /dev/null
+++ b/2207/天天乐学答案/C语言/C语言（二）/combine_c_files.sh
@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# ����ļ���
+output_file="combined.md"
+
+# ��ջ򴴽�����ļ�
+> "$output_file"
+
+# ���� 1.c �� 20.c
+for i in {1..20}; do
+    file="${i}.c"
+    
+    # ����ļ��Ƿ����
+    if [[ -f "$file" ]]; then
+        # ���ӱ���
+        echo "### C����-${i}" >> "$output_file"
+        
+        # ���Ӵ���鿪ʼ
+        echo '```c' >> "$output_file"
+        
+        # ���ļ�����ֱ��׷�ӵ�����ļ�����Ϊ GB2312 ���룩
+        cat "$file" >> "$output_file"
+        
+        # ���Ӵ�������
+        echo '```' >> "$output_file"
+        
+        # ����һ������
+        echo "" >> "$output_file"
+    else
+        echo "�ļ� $file �����ڣ�������"
+    fi
+done
\ No newline at end of file
diff --git a/2207/天天乐学答案/C语言/C语言（二）/combined.md b/2207/天天乐学答案/C语言/C语言（二）/combined.md
new file mode 100644
index 0000000..ed39b1c
--- /dev/null
+++ b/2207/天天乐学答案/C语言/C语言（二）/combined.md
@@ -0,0 +1,549 @@
+### C����-1
+```c
+/*-------------------------------------------------------
+��̼��㣺s=1��2��3��������n  ��n�ɼ������룬ʹ��forѭ����
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i,n,p;
+	p=1;
+	printf("������һ��������n:");
+	scanf("%d",&n);
+/**********Program**********/
+	for(i=2;i<=n;i++){
+		p*=i;	
+	}
+
+/**********  End  **********/
+	printf("1*2*...*%d = %d\n",n,p);
+}
+
+
+```
+
+### C����-2
+```c
+/*-------------------------------------------------------
+��̼���еĽ���ֵ��ֱ�����һ��ľ���ֵС��10-5Ϊֹ����Ҫ����С�����10λ: ��ʹ��while�� 
+-------------------------------------------------------*/
+#include <stdio.h>
+#include <math.h>
+main()
+{
+	int i,f;
+	double t,s;
+	f=1;
+	s=0;
+	i=1;
+	t=1.0;
+/**********Program**********/
+	while(fabs(t/i)>1e-5){
+		s+=t/i*f;//��������ֵ
+		f*=-1;//��ת����
+		i+=2;
+	}
+
+/**********  End  **********/	
+	s=s*4;
+	printf("Բ���ʵĽ���ֵΪ��%.10f\n",s);
+}
+```
+
+### C����-3
+```c
+/*-------------------------------------------------------
+��̼���еĽ���ֵ��ֱ�����һ��ľ���ֵС��10-5Ϊֹ��ʹ��while��:  
+-------------------------------------------------------*/
+#include <stdio.h>
+#include <math.h>
+#define N 1e-5
+main()
+{
+	int i,f;
+	double t,s;
+	f=1;
+	s=0;
+	i=1;
+	t=1.0;
+/**********Program**********/
+	while(fabs(t/i)>N){
+		s+=t/i*f;//��������ֵ
+		f*=-1;//��ת����
+		i+=2;
+	}
+
+
+
+
+/**********  End  **********/	
+	s=s*4 ;
+	printf("Բ���ʵĽ���ֵΪ��%f\n",s);
+}
+```
+
+### C����-4
+```c
+/*-------------------------------------------------------
+���ܣ����ʵ����1-10������1��������10��֮����������ij˻����������ʹ��while��
+--------------------------------------------------------*/
+#include <stdio.h>
+main( )
+{  
+    int i=1, sum=1;
+/**********Program**********/
+	while(i<10){
+		sum*=i;
+		i++;
+	}
+
+/**********  End  **********/    
+    printf("the sum of odd is :%d\n",sum);
+}
+
+```
+
+### C����-5
+```c
+/*-------------------------------------------------------
+���ܣ��Ӽ������������ɸ�ѧ���ijɼ���ͳ�Ʋ������߳ɼ�����
+�ͳɼ��������븺��ʱ�������롣��ʹ��whileѭ����
+--------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int x,max,min;
+	printf("please input x:\n");
+	scanf("%d",&x); 
+	max=x;
+	min=x;
+/**********Program**********/
+	while(x > 0){
+		if(x > max){
+			max = x;
+		}
+		if(x < min){
+			min = x;
+		}
+		scanf("%d", &x);
+	}
+
+
+
+
+/**********  End  **********/	
+	printf("max=%d,min=%d\n",max,min);
+}
+```
+
+### C����-6
+```c
+/*-------------------------------------------------------
+��̼��㣺ʹ��for���㣬s=1+2+3+����+n   ��n�ɼ������룩
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i,n,sum;
+	sum=0;
+	printf("������һ��������n:");
+	scanf("%d",&n);
+/**********Program**********/
+	for(i=1;i<=n;i++){
+		sum+=i;
+	}
+
+/**********  End  **********/
+	printf("1+2+...+%d = %d\n",n,sum);
+}
+
+
+```
+
+### C����-7
+```c
+/*-------------------------------------------------------
+���ܣ���д�Ƚ�a��b�������Ĵ�С���ҰѴ��߸���max��С�߸���min��
+--------------------------------------------------------*/
+#include"stdio.h"
+main()
+{
+	int a,b,min,max;
+	printf("������������a,b:");
+	scanf("%d,%d",&a,&b);
+/**********Program**********/
+	if (a > b) {
+		max = a;
+		min = b;
+	} else {
+		max = b;
+		min = a;
+	}
+/**********  End  **********/	
+	printf("min=%d,max=%d\n",min,max);
+}
+
+```
+
+### C����-8
+```c
+/*-------------------------------------------------------
+���ܣ�������������x,y,z���������������С���������
+--------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+    int x,y,z,t;
+    scanf("%d%d%d",&x , &y , &z);
+/**********Program**********/
+	if (x > y) {
+		t = x;
+		x = y;
+		y = t;
+	}
+	if (y > z) {
+		t = y;
+		y = z;
+		z = t;
+	}
+	if (x > y) {
+		t = x;
+		x = y;
+		y = t;
+	}
+/**********  End  **********/
+    printf("small to big: %d %d %d\n",x,y,z);
+}
+```
+
+### C����-9
+```c
+/*-------------------------------------------------------
+���ܣ��Ӽ�����������n,���n�������������ĺ͡�(ʹ��forѭ����
+--------------------------------------------------------*/
+#include<stdio.h>
+void main()
+{
+   int n,i,s;
+    s=0;
+    scanf("%d",&n);
+/**********Program**********/
+	for(i=1;i<=n;i++){
+		if(i%2==1){
+			s+=i;
+		}
+	}
+
+/**********  End  **********/    
+    printf("s=%d\n",s);
+}
+```
+
+### C����-10
+```c
+/*-------------------------------------------------------
+��̼��㣺s=1!+3!+5!+��n!   ��n�ɼ�������,ʹ��forѭ����
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i,j,n;
+	long p,sum;
+	sum=0;
+	printf("������һ��������n:");
+	scanf("%d",&n);
+/**********Program**********/
+	p = 1;
+	for ( i = 1;i <= n; i++ ) {
+		p *= i;
+		if ( i%2 == 1 ) {
+			sum += p;
+		}
+	}
+
+/**********  End  **********/	
+	printf("1!+3!+...+%d!= %d\n",n,sum);
+}
+```
+
+### C����-11
+```c
+/*-------------------------------------------------------
+��̼�����e����ֵ�� 
+��while�����ֱ�����һ��ֵС��10-5Ϊֹ��
+e=0+1+1/1+1/1/2+1/1/2/3...
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i;
+	double t,e;
+	i=1;
+	t=1.0;
+	e=0;
+/**********Program**********/
+	e = 2;
+	i = 2;
+	while(t/i > 1e-5){
+		e += t/i;
+		t /= i++;
+	}
+
+/**********  End  **********/	
+	printf("e=%f\n",e);
+}
+
+```
+
+### C����-12
+```c
+/*------------------------------------------------------- 
+��̼�����e����ֵ��  ��for�����ǰ50��֮�͡�   
+e=0+1+1/1+1/1/2+1/1/2/3...
+-------------------------------------------------------*/ 
+#include <stdio.h> 
+main() 
+{
+	int i;  
+	double t,e;  
+	t=1.0;  
+	e=0; 
+	for(i=1;i<=50;i++) 
+	{
+/**********Program**********/
+		e += t;
+		t /= i;
+/**********  End  **********/	  
+	}
+	printf("ǰ50��֮��Ϊ��%f\n",e);  
+}
+
+```
+
+### C����-13
+```c
+/*-------------------------------------------------------
+���ܣ�����һ��Բ�뾶��r������r>��0ʱ�����㲢���Բ�����(area)���ܳ�(circumference)�����������ʾ��Ϣ��
+--------------------------------------------------------*/
+#include <stdio.h>
+#define PI 3.14 
+main()
+{ 
+	float r,s,l;
+	printf("please input r:\n");
+	scanf("%f",&r);
+	if (r>=0)
+	{
+/**********Program**********/
+	s = PI * r*r;
+	l = 2*PI*r;
+
+/**********  End  **********/
+		printf("the area is %f\n",s);        
+		printf("the circumference is %f\n",l);
+	}
+	else
+		printf("input error!\n"); 
+}
+
+```
+
+### C����-14
+```c
+/*-------------------------------------------------------
+���ܣ���д����������λ����100-999����Ȼ�������������������������456�L�����654����
+--------------------------------------------------------*/
+#include <stdio.h>
+void main()
+{
+	int n,ge,shi,bai;
+	printf("������һ����λ��������");
+	scanf("%d",&n);
+	if((n<100)||(n>999))
+		printf("������������\n");
+	else
+	{
+/**********Program**********/
+	ge = n % 10;
+	shi = n % 100 / 10;
+	bai = n / 100;
+
+
+/**********  End  **********/
+         printf("������������������%d%d%d\n",ge,shi,bai);
+	}
+}
+
+```
+
+### C����-15
+```c
+/*-------------------------------------------------------
+��̼��㣺s=1!+2!+3!+��n!   ��n�ɼ������룬ʹ��forѭ����
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i,j,n;
+	long p,sum;
+	sum=0;
+	printf("������һ��������n:");
+	scanf("%d",&n);
+/**********Program**********/
+	p = 1;
+	for( i = 1;i <= n; i++ ){
+		p *= i;
+		sum += p;
+	}
+
+/**********  End  **********/
+	printf("1!+2!+...+%d!= %d\n",n,sum);
+}
+```
+
+### C����-16
+```c
+/*-------------------------------------------------------
+��̼��㣺s=1-3+5-7+����-99��ʹ��forѭ����
+-------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i,f,sum;
+	f=1;
+	sum=0;
+/**********Program**********/
+	for(i=1;i<=99;i++){
+		if(i%2==1){
+			sum += i*f;
+			f*=-1;
+		}
+
+	}
+
+/**********  End  **********/	
+	printf("1-3+5-7+...-99 = %d\n",sum);
+}
+
+```
+
+### C����-17
+```c
+/*-------------------------------------------------------
+���ܣ���дһ���򵥼��������������ʽΪ��a op b������ a��b��
+  �μ��������������op Ϊ�����������ȡֵֻ����+��-��*��/�� 
+������ע�������ʽ��
+   ���룺3��+��4
+   �����3.000000+4.000000=7.000000
+--------------------------------------------------------*/
+#include<stdio.h>
+main() 
+{ 
+    float a,b;
+    char op;
+    printf("Please enter a,b and op:");
+    scanf("%f,%c,%f",&a,&op,&b);
+    switch(op)
+    { 
+/**********Program**********/
+	case '+':printf("%f+%f=%f\n", a, b, a+b);break;
+	case '-':printf("%f-%f=%f\n", a, b, a-b);break;
+	case '*':printf("%f*%f=%f\n", a, b, a*b);break;
+/**********  End  **********/
+      case '/':if(b!=0) 
+                  printf("%f/%f=%f\n",a,b,a/b);
+               else
+                  printf("error!\n");break;
+      default:printf("error!\n");break;
+   }
+}
+
+```
+
+### C����-18
+```c
+/*-------------------------------------------------------
+���ܣ���д���򣬰��������������Ĵ�ӡ������
+--------------------------------------------------------*/
+#include"stdio.h"
+main()
+{
+	int a,b,c,m;
+	scanf("%d,%d,%d", &a,&b,&c);
+/**********Program**********/
+	m = a;
+	if( b > m ){
+		m  = b;
+	}
+	if ( c > m ) {
+		m = c;
+	}
+
+/**********  End  **********/
+	printf ("m=%d\n",m);
+}
+```
+
+### C����-19
+```c
+/*-------------------------------------------------------
+���ܣ���ʹ��forѭ����ӡ������ͼ�������Σ�
+	
+   *
+  ***
+ *****
+*******
+ *****
+  ***
+   * 
+--------------------------------------------------------*/
+#include <stdio.h>
+main()
+{
+	int i,j,k;
+/**********Program**********/
+	for(i=-3;i<=3;i++){
+		for(j=0;j<(i<0?-i:i);j++){
+			printf(" ");
+		}
+		for(k=0;k<7-j*2;k++){
+			printf("*");
+		}
+		printf("\n");
+	}
+/**********  End  **********/	
+}
+
+```
+
+### C����-20
+```c
+/*-------------------------------------------------------
+���ܣ��ҳ�n����������������С�������������ǵ�ֵ���������
+--------------------------------------------------------*/
+#include<stdio.h>
+int main()
+{
+	int a,n,i,min,max;
+	scanf("%d",&n);
+	scanf("%d",&a);
+	min=a;
+	max=a;
+	for(i=1;i<n;i++)
+	{
+/**********Program**********/
+		scanf("%d", &a);
+		if(a > max){
+			max = a;
+		}
+		if(a < min){
+			min = a;
+		}
+/**********  End  **********/	
+	}
+	printf("The maximum number is %d.\n",max);
+	printf("The minimum number is %d.\n",min);
+}
+
+```
+