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2207/C语言同步练习.md

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+## 选择结构
+
+### 选择结构-1
+
+![image-20250220225958223](https://yp.smallkun.cn/markdown/image-20250220225958223.png!compress)
+
+```c
+#include <stdio.h>
+
+/*
+if(条件){
+	复合语句(条件为真时执行) 
+}else{
+	复合语句(条件为假时执行) 
+}
+*/
+int main(void){
+
+	int x, y, z, t;//定义三个整型变量
+	//数据类型 变量名1, 变量名2;
+	scanf("%d%d%d", &x, &y, &z);
+	if(x > y){
+		t = x;
+		x = y;
+		y = t;
+	}//实现x和y比较 大数放y位置 
+	if(y > z){
+		t = y;
+		y = z;
+		z = t;
+	}//实现y和z比较 大数放z位置 z为三个数字中最大数
+	if(x > y){
+		t = x;
+		x = y;
+		y = t;
+	}
+	printf("%d %d %d\n", x, y, z);
+	
+	return 0;
+}
+
+```
+
+### 选择结构-2
+
+![image-20250220230052521](https://yp.smallkun.cn/markdown/image-20250220230052521.png!compress)
+
+```c
+#include <stdio.h> 
+
+int main(void){
+	
+	
+	int a;
+	
+	scanf("%d", &a);
+	printf("该数的位数为%d\n", 
+	(a/10==0?1:(a/100==0?2:(a/1000==0?3:(a/10000==0?4:5)))));
+	printf("%d", a%10);
+	if(a%100/10 != 0){
+		printf("%d", a%100/10);
+	}
+	if(a%1000/100 != 0){
+		printf("%d", a%1000/100);
+	}
+	if(a%10000/1000 != 0){
+		printf("%d", a%10000/1000);
+	}
+	if(a/10000 != 0){
+		printf("%d", a/10000);
+	}
+	printf("\n");
+	return 0;
+}
+
+```
+
+### 选择结构-3
+
+![image-20250220230133563](https://yp.smallkun.cn/markdown/image-20250220230133563.png!compress)
+
+```c
+#include <stdio.h>
+
+int main(void){
+	
+	float a, b, result;
+	int flag;
+	printf("请输入两个数字:");
+	scanf("%f %f", &a, &b);
+	printf("请输入您要进行的操作(1.做加法 2.做乘法 3.做除法):");
+	scanf("%d", &flag);
+	switch(flag){
+		case 1:result = a+b;break;
+		case 2:result = a*b;break;
+		case 3:result = a/b;break;
+	}
+	printf("结果为%f\n", result);
+	
+	return 0;
+}
+
+```
+
+### 选择结构-4
+
+![image-20250220230626411](https://yp.smallkun.cn/markdown/image-20250220230626411.png!compress)
+
+```c
+#include <stdio.h>
+
+int main(void){
+	
+	int year, month, day, days=0;
+	
+	scanf("%d-%d-%d", &year, &month, &day);
+	days+=day;
+	//1 3 5 7 8 10 12
+	//从前一个月开始依次 
+	switch(month-1){
+		case 11:days+=30;
+		case 10:days+=31;
+		case 9:days+=30;
+		case 8:days+=31;
+		case 7:days+=31;
+		case 6:days+=30;
+		case 5:days+=31;
+		case 4:days+=30;
+		case 3:days+=31;
+		case 2:days+=28;
+		case 1:days+=31;
+	}
+	if(month>3 && (year%4==0&&year%100!=0 || year%400==0)){
+		days++;
+	} 
+	printf("%d\n", days);
+	
+	
+	return 0;
+}
+```
+
+---
+
+## 循环结构
+
+### 循环结构-1
+
+![image-20250220230645828](https://yp.smallkun.cn/markdown/image-20250220230645828.png!compress)
+
+```c
+#include <stdio.h>
+
+
+/*
+1.解决字符的循环输入
+while((ch=getchar())!='\n')
+
+2.判断字符类型
+ASCALL码范围 
+
+*/
+int main(){
+	
+	char ch;
+	int l, d, o;//l字母的个数 d为数字个数 o为其他字符个数
+	l=d=o=0;
+	while((ch=getchar()) != '\n'){
+		if(ch >= 'a' && ch<='z' || ch >= 'A' && ch<='Z' ){
+			l++;
+		}else if(ch >= '0' && ch <= '9'){
+			d++;
+		}else{
+			o++;
+		}
+	} 
+	printf("字母个数:%d 数字个数:%d 其他个数%d\n", l, d, o);	
+	
+	return 0;
+}
+```
+
+### 循环结构-2
+
+![image-20250220230945704](https://yp.smallkun.cn/markdown/image-20250220230945704.png!compress)
+
+```c
+
+```
+
+### 循环结构-3
+
+![image-20250220230952843](https://yp.smallkun.cn/markdown/image-20250220230952843.png!compress)
+
+```c
+```
+
+### 循环结构-4
+
+![image-20250220231000056](https://yp.smallkun.cn/markdown/image-20250220231000056.png!compress)
+
+```c
+```
+
+### 循环结构-5
+
+![image-20250220231006104](https://yp.smallkun.cn/markdown/image-20250220231006104.png!compress)
+
+```c
+```
+
+### 循环结构-6
+
+![image-20250220231012110](https://yp.smallkun.cn/markdown/image-20250220231012110.png!compress)
+
+```c
+```
+
+### 循环结构-7
+
+![image-20250220231022607](https://yp.smallkun.cn/markdown/image-20250220231022607.png!compress)
+
+```c
+```
+
+### 循环结构-8
+
+![image-20250220231027969](https://yp.smallkun.cn/markdown/image-20250220231027969.png!compress)
+
+```c
+```
+
+### 循环结构-9
+
+![image-20250220231034218](https://yp.smallkun.cn/markdown/image-20250220231034218.png!compress)
+
+```c
+```
+
+### 循环结构-10
+
+![image-20250220231039716](https://yp.smallkun.cn/markdown/image-20250220231039716.png!compress)
+
+```c
+```
+
+---
+
+## 数组
+
+### 数组-1
+
+![image-20250220231426147](https://yp.smallkun.cn/markdown/image-20250220231426147.png!compress)
+
+
+
+### 数组-2
+
+![image-20250220231434409](https://yp.smallkun.cn/markdown/image-20250220231434409.png!compress)
+
+
+
+### 数组-3
+
+![image-20250220231441384](https://yp.smallkun.cn/markdown/image-20250220231441384.png!compress)
+
+
+
+### 数组-4
+
+![image-20250220231447834](https://yp.smallkun.cn/markdown/image-20250220231447834.png!compress)
+
+
+
+### 数组-5
+
+![image-20250220231704799](https://yp.smallkun.cn/markdown/image-20250220231704799.png!compress)
+
+---
+
+## 函数
+
+
+
+## 指针
+
+
+
+## 编译预处理
+
+
+
+## 结构体
+
+
+
+## 文件
+
+## 

2207/C语言同步练习源码/1.选择结构-3.c

@@ -1,6 +1,6 @@
 #include <stdio.h>
 
-int main(){
+int main(void){
 	
 	float a, b, result;
 	int flag;

2207/C语言同步练习源码/1.选择结构-4.c

@@ -1,6 +1,6 @@
 #include <stdio.h>
 
-int main(){
+int main(void){
 	
 	int year, month, day, days=0;