int price=0; scanf("%d",&price);
时间: 2024-05-29 12:10:24 浏览: 8
&price);
This code reads an integer input from the user and stores it in the variable "price". The "%" character is used to indicate that the input should be interpreted as an integer, and the "&" character is used to pass the address of the variable "price" to the scanf() function, so that the input value can be stored in that variable.
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int id = 22; string name = "添加书籍"; int number = 20; int price = 10; string author = "添加成功"; printf("请输入I D:"); scanf("%d", &id); printf("请输入书名:"); scanf("%s", &name); printf("请输入数量:"); scanf("%d", &number); printf("请输入价格:"); scanf("%d", &price); printf("请输入作者:"); scanf("%s", &author); printf("测试当前信息---id=%d,name=%s,number=%d,price=%d,author=%s",id,name,number,price,author); string sql = "insert into books values(" + to_string(id) + ",'" + name + "'," + to_string(number) + "," + to_string(price) + ",'" + author + "')"; int ret = mysql_query(&mysql, sql.c_str()); if (ret) { cout << "Error: Query[添加成功] fail." << endl; break; }优化这段c++代码,换一种更好的输出方式
可以使用cout代替printf输出,同时使用<<符号连接字符串和变量,使代码更简洁易懂。优化后的代码如下:
```
int id = 22;
string name = "添加书籍";
int number = 20;
int price = 10;
string author = "添加成功";
cout << "请输入ID:";
cin >> id;
cout << "请输入书名:";
cin >> name;
cout << "请输入数量:";
cin >> number;
cout << "请输入价格:";
cin >> price;
cout << "请输入作者:";
cin >> author;
cout << "测试当前信息---id=" << id << ",name=" << name << ",number=" << number << ",price=" << price << ",author=" << author << endl;
string sql = "insert into books values(" + to_string(id) + ",'" + name + "'," + to_string(number) + "," + to_string(price) + ",'" + author + "')";
int ret = mysql_query(&mysql, sql.c_str());
if (ret) {
cout << "Error: Query[添加成功] fail." << endl;
break;
}
```
#include<stdio.h> int main() { int price = 0; printf("请输入金额(元)"); scanf_s ("%d,&prtice" ); int charge = 100 - price; printf("找您%d元\n", charge); return 0; }
这是一个简单的 C 语言程序,实现了一个找零的功能。用户输入一个金额,程序会自动计算出找回给用户的钱数。不过有一个小问题,代码中的 scanf_s 函数的参数书写有误,应该是 scanf_s("%d", &price)。正确的代码如下:
```c
#include <stdio.h>
int main() {
int price = 0;
printf("请输入金额(元)");
scanf_s("%d", &price);
int charge = 100 - price;
printf("找您%d元\n", charge);
return 0;
}
```
当用户输入金额后,程序会计算出找回的钱数并输出。这个程序比较简单,但是也是 C 语言初学者的一个练手好题。