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<>用户登录程序实现
题目要求：编写代码实现，模拟用户登陆情景，并且只能登陆三次，（只允许输入三次密码，如果密码正确则提示登陆成功，如果三次均输入错误，则退出程序）。
<>代码如下：
int main() { int i=0; char password[20]={0}; //假设正确的密码是字符串'123456' for(i=0;i<3;
i++) { printf("请输入密码：>"); scanf("%s",password);
//两个字符串的比较不能使用==，应该使用strcmp函数，专门用来比较两个字符串； //使用strcmp函数也必须调用#include<string.h>;
if(strcmp(password,"123456")==0) { printf("登陆成功\n"); break; } else { printf(
"密码错误请重新输入！")； } if(i==3) { printf("三次密码均错误，退出程序\n")； } } return 0; }
注意:
strlen函数，strcmp函数都是字符串函数，如果想使用都必须包含头文件#include<string.h>
<>总结
使用字符串函数时要注意引用头文件#include<string.h>.
