diff --git a/课程设计3.c b/课程设计3.c
new file mode 100644
index 0000000..140522f
--- /dev/null
+++ b/课程设计3.c
@@ -0,0 +1,334 @@
+#include<stdio.h>
+#include<string.h>
+#include<windows.h>
+#include<math.h>
+#include<stdlib.h>
+#include<time.h>
+#include<dos.h>
+
+int main() {
+	system("color f4");
+	struct BOOK {
+		char title[20];
+		char author[20];
+		char publice[20];
+		char time[20];
+		float price;
+		char locate[20];
+		int base;
+		//Êé¼®Ãû³Æ£¬×÷Õߣ¬³ö°æÉ磬³ö°æÈÕÆÚ£¬¼Û¸ñ£¬ÔÚĿ¼ÖеÄλÖÃ
+	};
+
+	struct BOOK *book;
+	int N=21;
+	book=(struct BOOK*)malloc(N*sizeof(struct BOOK));
+	strcpy( book[0].title, "¡¶À˳±Ö®áÛ¡·");
+	strcpy( book[0].author, "Îâ¾ü");
+	strcpy( book[0].publice, "ÈËÃñÓʵç³ö°æÉç");
+	strcpy( book[0].time, "2016Äê5ÔÂ1ÈÕ");
+	book[0].price=99.00;
+	strcpy( book[0].locate, "Êé¼ÜAÇø");
+	book[0].base=19;
+
+	strcpy( book[1].title, "¡¶È˼äʧ¸ñ¡·");
+	strcpy( book[1].author, "Ì«Ô×ÖÎ");
+	strcpy( book[1].publice, "ÏÖ´ú³ö°æÉç");
+	strcpy( book[1].time, "2016Äê10ÔÂ");
+	book[1].price=26.00;
+	strcpy( book[1].locate, "Êé¼ÜBÇø");
+	book[1].base=9;
+
+	strcpy( book[2].title, "¡¶Î§³Ç¡·");
+	strcpy( book[2].author, "Ç®ÖÓÊé");
+	strcpy( book[2].publice, "ÉϺ£³¿¹â³ö°æÉç");
+	strcpy( book[2].time, "1947Äê");
+	book[2].price=40.00;
+	strcpy( book[2].locate, "Êé¼ÜCÇø");
+	book[2].base=49;
+
+
+	strcpy( book[3].title, "¡¶ºì¸ßÁ»¼Ò×å¡·");
+	strcpy( book[3].author, "ĪÑÔ");
+	strcpy( book[3].publice, "ÈËÃñÎÄѧ³ö°æÉç");
+	strcpy( book[3].time, "2007Äê1ÔÂ");
+	book[3].price=28.00;
+	strcpy( book[3].locate, "Êé¼ÜDÇø");
+	book[3].base=39;
+
+	strcpy( book[4].title, "¡¶°ÙÄê¹Â¶À¡·");
+	strcpy( book[4].author, "¼ÓÎ÷ÑÇ¡¤Âí¶û¿Ë˹");
+	strcpy( book[4].publice, "о­µäÎÄ»¯");
+	strcpy( book[4].time, "2011Äê6ÔÂ");
+	book[4].price=39.50;
+	strcpy( book[4].locate, "Êé¼ÜEÇø");
+	book[4].base=29;
+
+	strcpy( book[5].title,"¡¶Æ½·²µÄÊÀ½ç¡·");
+	strcpy( book[5].author, "·ң");
+	strcpy( book[5].publice, "±±¾©Ê®ÔÂÎÄÒÕ³ö°æÉç");
+	strcpy( book[5].time, "2017Äê6ÔÂ1ÈÕ");
+	book[5].price=29.90;
+	strcpy( book[5].locate, "¶þÂ¥302");
+	book[5].base=50;
+
+	strcpy( book[6].title,"¡¶ÀÏÈËÓ뺣¡·");
+	strcpy( book[6].author, "º£Ã÷Íþ");
+	strcpy( book[6].publice, "×÷¼Ò³ö°æÉç");
+	strcpy( book[6].time, "2016Äê1ÔÂ1ÈÕ");
+	book[6].price=13.10;
+	strcpy( book[6].locate, "¶þÂ¥302");
+	book[6].base=50;
+
+	strcpy( book[7].title,"¡¶ÉñÇú¡·");
+	strcpy( book[7].author, "µ«¶¡");
+	strcpy( book[7].publice, "ÉϺ£ÒëÎijö°æÉç");
+	strcpy( book[7].time, "2011Äê1ÔÂ1ÈÕ");
+	book[7].price=29.90;
+	strcpy( book[7].locate, "¶þÂ¥302");
+	book[7].base=50;
+
+	strcpy( book[8].title,"¡¶ÂæÍÕÏé×Ó¡·");
+	strcpy( book[8].author, "ÀÏÉá");
+	strcpy( book[8].publice, "Õã½­¹¤ÉÌ´óѧ³ö°æÉç");
+	strcpy( book[8].time, "2017Äê8ÔÂ1ÈÕ");
+	book[8].price=16.30;
+	strcpy( book[8].locate, "¶þÂ¥302");
+	book[8].base=50;
+
+	strcpy( book[9].title,"¡¶³¯»¨Ï¦Ê°¡·");
+	strcpy( book[9].author, "³Ѹ");
+	strcpy( book[9].publice, "̨º£³ö°æÉç");
+	strcpy( book[9].time, "2012Äê8ÔÂ1ÈÕ");
+	book[9].price=22.40;
+	strcpy( book[9].locate, "¶þÂ¥302");
+	book[9].base=50;
+
+	strcpy( book[10].title,"¡¶²è»¨Å®¡·");
+	strcpy( book[10].author, "СÖÙÂí");
+	strcpy( book[10].publice, "Î÷°²½»Í¨´óѧ³ö°æÉç");
+	strcpy( book[10].time, "2017Äê8ÔÂ1ÈÕ");
+	book[10].price=10.10;
+	strcpy( book[10].locate, "¶þÂ¥302");
+	book[10].base=50;
+
+	strcpy( book[11].title,"¡¶°ÁÂýÓëÆ«¼û¡·");
+	strcpy( book[11].author, "°Â˹¶¡");
+	strcpy( book[11].publice, "Î÷°²½»Í¨´óѧ³ö°æÉç");
+	strcpy( book[11].time, "2017Äê1ÔÂ1ÈÕ");
+	book[11].price=15.50;
+	strcpy( book[11].locate, "¶þÂ¥302");
+	book[11].base=50;
+
+	strcpy( book[12].title,"¡¶ºìÓëºÚ¡·");
+	strcpy( book[12].author, "˹µ±´ï");
+	strcpy( book[12].publice, "Î÷°²½»Í¨´óѧ³ö°æÉç");
+	strcpy( book[12].time, "2017Äê7ÔÂ1ÈÕ");
+	book[12].price=18.90;
+	strcpy( book[12].locate, "¶þÂ¥302");
+	book[12].base=50;
+
+	strcpy( book[13].title,"¡¶×ïÓë·£¡·");
+	strcpy( book[13].author, "ÍÓ˼Í×Ò®·ò˹»ù");
+	strcpy( book[13].publice, "Î÷°²½»Í¨´óѧ³ö°æÉç");
+	strcpy( book[13].time, "2016Äê11ÔÂ10ÈÕ");
+	book[13].price=27.20;
+	strcpy( book[13].locate, "¶þÂ¥302");
+	book[13].base=50;
+
+	strcpy( book[14].title,"¡¶Õ½ÕùÓëºÍƽ¡·");
+	strcpy( book[14].author, "Áзò¡¤Íжû˹̩");
+	strcpy( book[14].publice, "Î÷°²½»Í¨´óѧ³ö°æÉç");
+	strcpy( book[14].time, "2016Äê11ÔÂ1ÈÕ");
+	book[14].price=56.70;
+	strcpy( book[14].locate, "¶þÂ¥302");
+	book[14].base=50;
+
+	strcpy( book[15].title,"¡¶°ÍÀèʥĸԺ¡·");
+	strcpy( book[15].author, "Óê¹û");
+	strcpy( book[15].publice, "ÉϺ£ÎÄÒÕ³ö°æÉç");
+	strcpy( book[15].time, "2008Äê1ÔÂ1ÈÕ");
+	book[15].price=14.10;
+	strcpy( book[15].locate, "¶þÂ¥302");
+	book[15].base=50;
+
+	strcpy( book[16].title,"¡¶¼Ò¡·");
+	strcpy( book[16].author, "°Í½ð");
+	strcpy( book[16].publice, "ÈËÃñÎÄѧ³ö°æÉç");
+	strcpy( book[16].time, "1981Äê9ÔÂ1ÈÕ");
+	book[16].price=24.10;
+	strcpy( book[16].locate, "¶þÂ¥302");
+	book[16].base=50;
+
+	strcpy( book[17].title,"¡¶±ß³Ç¡·");
+	strcpy( book[17].author, "Éò´ÓÎÄ");
+	strcpy( book[17].publice, "±±¾©Ê®ÔÂÎÄÒÕ³ö°æÉç");
+	strcpy( book[17].time, "2018Äê8ÔÂ1ÈÕ");
+	book[17].price=19.70;
+	strcpy( book[17].locate, "¶þÂ¥302");
+	book[17].base=50;
+
+	strcpy( book[18].title,"¡¶ºìÑÒ¡·");
+	strcpy( book[18].author, "ÂÞ¹ã±ó");
+	strcpy( book[18].publice, "ÖйúÇàÄê³ö°æÉç");
+	strcpy( book[18].time, "2017Äê9ÔÂ1ÈÕ");
+	book[18].price=22.70;
+	strcpy( book[18].locate, "¶þÂ¥302");
+	book[18].base=50;
+
+	strcpy( book[19].title,"¡¶Äź°¡·");
+	strcpy( book[19].author, "³Ѹ");
+	strcpy( book[19].publice, "°²»Õ½ÌÓý³ö°æÉç");
+	strcpy( book[19].time, "2015Äê1ÔÂ1ÈÕ");
+	book[19].price=15.40;
+	strcpy( book[19].locate, "¶þÂ¥302");
+	book[19].base=50;
+
+	strcpy( book[20].title,"¡¶»î×Å¡·");
+	strcpy( book[20].author, "Ó໪");
+	strcpy( book[20].publice, "×÷¼Ò³ö°æÉç");
+	strcpy( book[20].time, "2012Äê8ÔÂ1ÈÕ");
+	book[20].price=15.30;
+	strcpy( book[20].locate, "¶þÂ¥302");
+	book[20].base=50;
+
+
+
+	struct user {
+		char user_name[100];
+		char user_pass[100];
+	} stu[2]= {{"xiaocong001","123456"},{"zhuzhu002","123456"}};
+	int num1=0;
+	int num2=0;
+	printf("***************»¶Ó­À´µ½ÉîÒ¹Êéµê´æ»õÇåµ¥¹ÜÀíϵͳµÇ¼½çÃæ***************\n");                  //µÇ¼ϵͳ
+	while(1) {
+		printf("\t\tÇëÊäÈëÄúµÄÓû§Ãû£º");
+		char u[100];
+
+		scanf("%s",u);
+
+		if(strcmp(stu[0].user_name,u)==0||strcmp(stu[1].user_name,u)==0) {
+			break;
+		}
+
+		else {
+			printf("²»´æÔÚ´ËÓû§£¡ÇëÖØÐÂÊäÈ룡\n");
+			num1++;
+			if(num1==3) {
+				printf("\n\t\tºÜ±§Ç¸£¬ÄúûÓÐȨÏÞ½øÈëϵͳ£¡\n");
+				exit(0);
+			}
+		}
+	}
+	system("cls");
+	printf("***************»¶Ó­À´µ½ÉîÒ¹Êéµê´æ»õÇåµ¥¹ÜÀíϵͳµÇ¼½çÃæ***************\n");
+	printf("\t\tÇëÊäÈëÃÜÂ룺");
+	while(1) {
+		char p[100];
+		scanf("%s",p);
+		if(strcmp(stu[0].user_pass,p)==0) {
+			printf("   µÇ¼³É¹¦\n");
+			break;
+		} else {
+			if(num2!=2) {
+				printf("\tÃÜÂë´íÎó£¬ÇëÖØÐÂÊäÈë:");
+			}
+			num2++;
+			if(num2==3) {
+				printf("\n");
+				printf("ÃÜÂëÊäÈë´íÎ󳬹ýÈý´Î£¬ÏµÍ³3Ãëºó½«¹Ø±Õ\n");
+				Sleep(1000);
+				printf("3\n");
+				Sleep(1000);
+				printf("2\n");
+				Sleep(1000);
+				printf("1\n");
+				exit(0);
+			}
+		}
+	}
+	system("cls");                //Ë¢ÆÁ
+	system("color e5");
+
+	char t[20],a[20];
+	int i;
+	float sum[100]= {0};
+
+
+	while(1) {
+		int n=0;
+		int j=0;
+		printf("\t\t***************************************\n");
+		printf("\t\t*ÈçÐèÍ˳öÊäÈë´øÓÐ'*'µÄÈÎÒâÁ½¸ö×Ö·û´®¡£*\n");
+		printf("\t\t*eg:'* *'                             *\n");
+		printf("\t\t***************************************\n\n\n");
+		printf("ÇëÊäÈëÄúÒªËÑÑ°µÄÊéÃûÓëÖøÕß:\n") ;
+
+		scanf("%s%s",&t,&a);
+		if((*t=='*')||(*a=='*')) {
+			printf("\t\tÇëÇóÍ˳öϵͳ³É¹¦\n");
+			break;
+		}
+		for(i=0; i<21; i++) {
+			if((strcmp(t,book[i].title)==0)||strcmp(t,book[i].author)==0) {
+				if((strcmp(a,book[i].author)==0)||strcmp(a,book[i].title)==0) {
+					printf("\t|-----------------------------------\n");
+					printf("\t|***********ÊéÄ¿ÔÚÇåµ¥ÄÚ***********|\n");
+					printf("\t|ÊéÃû        :%20s |\n", book[i].title);
+					printf("\t|ÖøÕß        :%20s |\n", book[i].author);
+					printf("\t|³ö°æÉç      :%20s |\n", book[i].publice);
+					printf("\t|³ö°æʱ¼ä    :%20s |\n", book[i].time);
+					printf("\t|¼Û¸ñ        :%20.2f |\n",book[i].price);
+					printf("\t|λÖà        :%20s |\n",book[i].locate);
+					printf("\t|¿â´æ        :%20d |\n",book[i].base);
+					printf("\t-----------------------------------|\n");
+					printf("ÇëÊäÈëËùÐèÊýÁ¿:");
+					int num;
+					int m=1;
+					while(m==1) {
+						scanf("%d",&num);
+						if(num<0) {
+							printf("ÊäÈëÓÐÎó.\n");
+							printf("ÇëÈëÕýÈ·µÄÊýÖµ£º");
+						} else if(num<=book[i].base) {
+							book[i].base=book[i].base - num;
+							printf("\n\n\t\tÒÑÑ¡¶¨%d ±¾ %s\n",num,book[i].title);
+							sum[i]=num*book[i].price;
+							printf("\t\tËùÐèÖ§¸¶µÄ½ð¶î:%.2f\n\n\n",sum[i]);
+							m=0;
+						} else {
+							printf("ËùÐèÊýÁ¿²»ÔÚ¿â´æ·¶Î§ÄÚ\n");
+							printf("ÇëÊäÈë¿â´æÒÔÄÚµÄÊýÁ¿£º");
+
+						}
+					}
+					n=1;
+				}
+
+			}
+
+		}
+		if(n==0) {
+			printf("\tÇëÊäÈëÕýÈ·µÄÊéÃûÒÔ¼°¶ÔÓ¦µÄ×÷Õß¡£\n");
+		}
+		printf("\t\t*Çë¼ÌÐøÌôÑ¡ËùÐèÊé¼®¡£\t*\n\t\t*Èç¹û²»ÐèÒªÇëÍ˳ö¡£\t*\n");
+		printf("\n");
+	}
+	float s=0.0;
+	for(i=0; i<21; i++)
+		s+=sum[i];
+	printf("\t\t\t\t×ܹ²ÐèÖ§¸¶£º%.2f\n",s);
+	Sleep(3000);
+	system("cls");
+	system("color f6");
+	Sleep(1000);
+	printf("\t\t\t\t»¶Ó­Ï´ιâÁÙÉîÒ¹Êéµê¡£\n");
+	Sleep(1000);
+	printf("\t\t\t\tÊéÖи㲻ºÃûÓлƽðÎÝ  ǧÖÓËÚ\n");
+	Sleep(1000);
+	printf("\t\t\t\tÑÕÈçÓñ\n");
+	Sleep(1000);
+	printf("\t\t\t\t¿ÉÊéµê  ÓÐÄã°¡");
+	return 0;
+}
+
+
diff --git a/课程设计3.exe b/课程设计3.exe
new file mode 100644
index 0000000..2934d29
Binary files /dev/null and b/课程设计3.exe differ