最后4位数字中的前两位表示当地派出所的编码;
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倒数第二位表示公民是男性还是女性(男性用单数,女性用双数);
最后一位数字是一个随机数,又称为校验码。 用来检验身份证的正确性。校检码可以是0~9的数字,有时也用x表示。
#includestdio.h
#include conio.h
#include stdlib.h
#include memory.h
#include string.h
#include time.h
#define AWARDER_NUM 10
typedef struct tag_award
{
char ID[20];
char name[20];
char telNo[20];
char address[50];
}AWARDER;
AWARDER * awarder = new AWARDER[AWARDER_NUM];
int first_award[1] = {-1};
int second_award[2] = {-1,-1};
int third_award[5] ={-1,-1,-1,-1,-1};
int awarder_num = 0;
void info_login()
{
if(awarder_num = AWARDER_NUM)
{
AWARDER * new_awarder = new AWARDER[awarder_num + AWARDER_NUM];
memcpy(new_awarder,awarder,awarder_num*sizeof(AWARDER));
delete awarder;
awarder = new_awarder;
}
printf("身份证号:");
scanf("%s",awarder[awarder_num].ID);
printf("姓名:");
scanf("%s",awarder[awarder_num].name);
printf("电话号码:");
scanf("%s",awarder[awarder_num].telNo);
printf("家庭住址:");
scanf("%s",awarder[awarder_num].address);
awarder_num++;
}
void info_delete()
{
char name[20];
printf("输入您要删除的抽奖者的姓名:");
scanf("%s",name);
for(int i=0;iawarder_num;i++)
{
if (strcmp(awarder[i].name,name) == 0)
{
printf("您选择删除的抽奖者的信息如下:\n");
printf("身份证号:%s\n",awarder[i].ID);
printf("姓名:%s\n",awarder[i].name);
printf("电话号码:%s\n",awarder[i].telNo);
printf("家庭住址:%s\n",awarder[i].address);
break;
}
}
if(i == awarder_num)
{
printf("没有找到您输入的抽奖者!\n");
}
else
{
char c;
printf("您确定要删除吗?(Y//N)");
fflush(stdin);
scanf("%c",c);
if(c == 'Y' || c == 'y')
{
AWARDER * new_award = new AWARDER[awarder_num-1];
if(i = 0)
memcpy(new_award,awarder+1,sizeof(AWARDER) * (awarder_num - 1));
else if( i = awarder_num -1)
memcpy(new_award,awarder,sizeof(AWARDER) * (awarder_num - 1));
else
{
memcpy(new_award,awarder,sizeof(AWARDER) * i);
memcpy(new_award+i,awarder+i+1,sizeof(AWARDER) * (awarder_num - i - 1));
}
awarder_num--;
delete awarder;
awarder = new_award;
}
}
}
void info_modify()
{
char name[20];
printf("输入您要修改的抽奖者的姓名:");
scanf("%s",name);
for(int i=0;iawarder_num;i++)
{
if (strcmp(awarder[i].name,name) == 0)
{
printf("您选择的抽奖者的信息如下:\n");
printf("身份证号:%s\n",awarder[i].ID);
printf("姓名:%s\n",awarder[i].name);
printf("电话号码:%s\n",awarder[i].telNo);
printf("家庭住址:%s\n",awarder[i].address);
break;
}
}
if(i == awarder_num)
{
printf("没有找到您输入的抽奖者!\n");
}
else
{
printf("请输入该抽奖者的新信息:\n");
printf("身份证号:");
scanf("%s",awarder[i].ID);
printf("姓名:");
scanf("%s",awarder[i].name);
printf("电话号码:");
scanf("%s",awarder[i].telNo);
printf("家庭住址:");
scanf("%s",awarder[i].address);
}
}
bool check_over(int cur_award,int awarderNo)
{
if(awarderNo == 1)
{
if(cur_award == first_award[0])
return true;
}
else if(awarderNo = 3)
{
if(cur_award == first_award[0])
return true;
for(int i=0;iawarderNo-1;i++)
if(cur_award == second_award[i])
return true;
}
else if(awarderNo = 8)
{
if(cur_award == first_award[0])
return true;
for(int i=0;i2;i++)
if(cur_award == second_award[i])
return true;
for(i=0;iawarderNo-3;i++)
if(cur_award == third_award[i])
return true;
}
return false;
}
void award()
{
if(awarder_num 8)
{
printf("人数太少,请添加足够的人再抽奖!\n");
return;
}
srand((long)time(0));
char hit_id[20];
printf("\n开始抽第一等奖(1名),按任意键开始...\n");
getch();
while(!kbhit())
{
first_award[0] = rand() % awarder_num;
memcpy(hit_id,awarder[first_award[0]].ID,18);
printf("\r ");
printf("\r %s",hit_id);
}
printf("\n\n开始抽第二等奖(2名)");
for (int i=0;i2;i++)
{
printf("\n第%d个二等奖,按任意键开始...\n",i+1);
getch();
while(!kbhit())
{
second_award[i] = rand() % awarder_num;
while(check_over(second_award[i],1+i))
second_award[i] = rand() % awarder_num;
memcpy(hit_id,awarder[second_award[i]].ID,18);
printf("\r ");
printf("\r %s",hit_id);
}
}
printf("\n\n开始抽第三等奖(5名)");
for (i=0;i5;i++)
{
printf("\n第%d个三等奖,按任意键开始...\n",i+1);
getch();
while(!kbhit())
{
third_award[i] = rand() % awarder_num;
while(check_over(third_award[i],3+i))
third_award[i] = rand() % awarder_num;
memcpy(hit_id,awarder[third_award[i]].ID,20);
printf("\r ");
printf("\r %s",hit_id);
}
}
}
void info_show()
{
printf("一等奖获得者:\n");
printf("\t身份证号:%s\n",awarder[first_award[0]].ID);
printf("\t姓名:%s\n",awarder[first_award[0]].name);
printf("\t电话号码:%s\n",awarder[first_award[0]].telNo);
printf("\t家庭住址:%s\n",awarder[first_award[0]].address);
printf("二等奖获得者:\n");
for (int i=0;i2;i++)
{
printf("第%d个二等奖获得者:\n");
printf("\t身份证号:%s\n",awarder[second_award[i]].ID);
printf("\t姓名:%s\n",awarder[second_award[i]].name);
printf("\t电话号码:%s\n",awarder[second_award[i]].telNo);
printf("\t家庭住址:%s\n",awarder[second_award[i]].address);
}
printf("三等奖获得者:\n");
for (int i=0;i5;i++)
{
printf("第%d个三等奖获得者:\n");
printf("\t身份证号:%s\n",awarder[third_award[i]].ID);
printf("\t姓名:%s\n",awarder[third_award[i]].name);
printf("\t电话号码:%s\n",awarder[third_award[i]].telNo);
printf("\t家庭住址:%s\n",awarder[third_award[i]].address);
}
}
/*提示信息*/
bool raise()
{
printf("\n请输入你需要的操作代号:\n");
printf("\t1.录入:完成抽奖者信息的输入;\n");
printf("\t2.删除:完成抽奖者信息的删除;\n");
printf("\t3.修改:允许对已经录入的数据重新进行编辑、修改;\n");
printf("\t4.抽奖:开始抽奖!\n");
printf("\t5.显示:显示所有中奖者的信息;\n");
printf("\t6.退出。\n");
printf("==");
int operate;
fflush(stdin);
scanf("%d",operate);
switch(operate)
{
case 1:
info_login();
break;
case 2:
info_delete();
break;
case 3:
info_modify();
break;
case 4:
award();
break;
case 5:
info_show();
break;
case 6:
return false;
default:
break;
}
printf("\n操作完成。\n");
return true;
}
void main()
{
while(raise());
}
#include stdio.h
#include string.h
void main()
{
int len,year,month,day;
char str[30],str1[10];
printf("\n请输入身份证号:\n");
gets(str);
len=strlen(str);
if(len==18)
{
sscanf(str, "%6c%4d%2d%2d", str1,year,month,day);
printf("出生日期:%d年%d月%d日\n",year,month,day);
}
else printf("输入错误!\n");
}
身份证号码中的第十七位通常是校验码,它是由前17位数字计算得出的,用于检验身份证号码的有效性。要提取身份证号码中的第十七位数,可以使用C语言中的字符串处理函数strncpy和strlen。
下面是一个示例代码:
在这个示例中,首先使用scanf函数读入一个身份证号码,并使用strlen函数计算它的长度。如果长度不为18,则认为这个身份证号码不合法,直接输出错误信息并结束程序。
否则,可以通过字符串索引方式直接取出第十七位校验码,并将其输出。注意,身份证号码中的每一位都是一个字符,因此在定义身份证号码的字符串时,需要预留一个额外的字符存储字符串的结尾标志\0,即定义为char id[19]。
需要注意的是,这只是提取身份证号码中的第十七位校验码,如果要进行身份证号码的完整校验,需要进行复杂的运算,具体实现方式可能因地区而异。