C 语言登录的例子

#include <stdio.h>      /* printf, fgets */
#include <stdlib.h>     /* atoi */
#include <time.h>
#include <string>
#include <cstring>
#include <math.h>
#include <sstream>

char * getTimeEncodeString();
bool login(char *pass_temp);

int main (){

    char pass_temp[7]="123456";

    printf("%s\n",getTimeEncodeString());
    printf("%d\n",login(pass_temp));
}

bool login(char *pass_temp){

    char *pass=getTimeEncodeString();

    if(strcmp(pass_temp,pass)==0){
        return true;
    }else{
        return false;
    }
}

char * getTimeEncodeString(){

    // 局部静态变量作为返回值
    static char dest[7];

    time_t rawtime;
    time( &rawtime );
    struct tm *info;
    info = localtime( &rawtime );

    char buffer[32];
//    strftime(buffer, 32, "%Y-%m-%d %H:%M:%S", info);
    strftime(buffer, 32, "%m%d%H", info);
    // 字符串转 long
    long passlong = atoi(buffer);
    // 加密算法
    passlong=passlong*137;
    char str_temp[10];
    // long 转字符串
    ltoa(passlong,str_temp,10);
    // 截取6个字符
    strncpy(dest, str_temp, 6);

    return dest;
}