1.c\u8bed\u8a00\u6c49\u5b57\u95ee\u9898<\/p>\n\n\n\n
2.\u6587\u4ef6\u5b58\u50a8\uff1a\u4e00\u6b21\u6027\u8bfb\u5165\u6570\u7ec4\u5904\u7406; \u5728\u6587\u4ef6\u76f4\u63a5\u5904\u7406,\u4fdd\u5b58\u65f6\u5148\u9500\u6bc1\uff0c\u518d\u91cd\u65b0\u5199\u3002\u6570\u636e\u4e22\u5931\u3002\u65f6\u95f4\u95ee\u9898\u3001\u5185\u5b58\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n
10000\u6761\u6570\u636e\uff0c\u53ea\u5904\u7406\u5176\u4e2d\u4e00\u6761\uff0c\u7f16\u8f91\u4e00\u4e0b\uff0c\u518d\u653e\u56de\u53bb\u3002<\/p>\n\n\n\n
fopen(“pathname”,”r|w|r+|w+|a+”);<\/p>\n\n\n\n
load();<\/p>\n\n\n\n
save():<\/p>\n\n\n\n
\u5199\u5165\u6587\u4ef6\uff1a<\/p>\n\n\n\n
\u5728\u64cd\u4f5c\u7cfb\u7edf\u4e0a\uff0c\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\uff0c\u6ca1\u6709\u6307\u5b9a\u6587\u4ef6\u5927\u5c0f\uff0c\u64cd\u4f5c\u7cfb\u7edf\u7ed9\u5206\u914d\u4e00\u4e2a\u5757\uff0c4K\uff0c\u7ed3\u6784\u4f53<\/p>\n\n\n\n
3.getchar\uff08\uff09<\/p>\n\n\n\n
4.\u5b66\u751f\u8eab\u4efdID\u552f\u4e00\u6027<\/p>\n\n\n\n
5.\u6570\u636e\u7ed3\u6784struct stu<\/p>\n\n\n\n
typedef<\/p>\n\n\n\n
6.\u7ed3\u6784\u4f53\u6240\u5360\u5927\u5c0f\u8ba1\u7b97<\/p>\n\n\n\n
7.\u5b66\u751f\u6863\u6848\u4fe1\u606f\u4e0e\u6210\u4fe1\u606f\u5206\u8868\u5b58\u653e<\/p>\n\n\n\n
8.\u67e5\u627e<\/p>\n\n\n\n
9.\u7f16\u8f91\/\u4fee\u6539<\/p>\n\n\n\n
void perror(const char *msg); \/\/#include <stdio.h><\/p>\n\n\n\n
char *strerror(int errnum);\/\/#include <string.h><\/p>\n\n\n\n
<\/p>\n\n\n\n
\u5b66\u53f7\uff1a\u5206\u914d\u5b66\u53f7\u7684\u65b9\u6848\uff0c<\/p>\n\n\n\n
Scanf\u4e00\u6761\u4fe1\u606f\uff0c\u67e5\u8be2\u4e00\u4e0b\u662f\u5426\u6709\u91cd\u5b66\u53f7\u7684\u4fe1\u606f\u3001\u8f93\u5165\u7684\u6210\u7ee9\u662f\u5426\u5408\u6cd5<\/p>\n\n\n\n
\u7f16\u8f91\u4fe1\u606f<\/p>\n\n\n\n
\u67e5\u8be2\u4fe1\u606f<\/p>\n\n\n\n
\u5220\u9664\u4fe1\u606f<\/p>\n\n\n\n
\u6392\u5e8f\uff1a<\/p>\n\n\n\n
Buffer:\u7f13\u51b2\u533a<\/p>\n\n\n\n
Size_t: \u6bcf\u4e2a\u7cfb\u7edf\u7684\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u6837\uff0c\u540c\u6837\u662fint,\u6709\u7684\u7cfb\u7edf\u75284\u4e2a\u5b57\u8282\u5b58\u50a8\u30018\u4f4d\u673aint<\/p>\n\n\n\n
Fflush();<\/p>\n\n\n\n
#include <stdio.h>\r\n#include <stdlib.h>\r\n#include <string.h>\r\n#include \"stu.h\"\r\n#include <windows.h>\r\n\r\n#define STUFLNM \"student.txt\"\r\n\r\nvoid printStu(STU * sp);\r\nvoid reg_1_stu(FILE *fp);\r\nvoid show(FILE *fp);\r\nint menu();\r\nvoid search(char * name,FILE *fp);\r\nvoid sort(int index,FILE *fp);\r\nint compar(const void *s1,const void * s2);\r\n\r\nint index;\r\n\r\nint main()\r\n{\r\n char sel;\r\n FILE *fp;\r\n\r\n SetConsoleOutputCP(65001); \/\/\u89e3\u51b3\u4e2d\u6587\u4e71\u7801\u95ee\u9898\r\n\r\n fp=fopen(STUFLNM,\"a+\");\r\n\r\n \/\/ printf(\"\\33[2J\");\r\n\r\n while(1) \/\/for(;;)\r\n {\r\n sel=menu();\r\n\r\n switch (sel)\r\n {\r\n case '1':\r\n reg_1_stu(fp);\r\n break;\r\n case '2':\r\n show(fp);\r\n break;\r\n case '3':\r\n printf(\"\u8bf7\u8f93\u5165\u5b66\u751f\u59d3\u540d\uff1a\\n\");\r\n char searchName[10];\r\n scanf(\"%s\",&searchName);\r\n \/\/printf(\"\u8f93\u5165\u7684\u5f85\u641c\u7d22\u59d3\u540d\uff1a%s\",searchName);\r\n search(searchName,fp);\r\n break;\r\n case '4':\r\n sort(1,fp);\r\n break;\r\n default:\r\n printf(\"Bye bye!\");\r\n exit(1);\r\n break; \r\n }\r\n\r\n }\r\n\r\n return 0;\r\n}\r\n\r\n\/*\r\n* Author:zgp\r\n* CreateTime: 2022-11-05 \r\n* Email:zgp@qq.com\r\n* Brief: \u6253\u5370\u4e00\u6761\u6210\u7ee9\u4fe1\u606f\r\n* Param: \u5b66\u751f\u4fe1\u606f\u7ed3\u6784\u4f53\r\n* Retval: \u65e0\r\n*\/\r\n\r\n\r\nvoid printStu(STU * sp)\r\n{\r\n printf(\"id:%d--name:%s--chinese:%s--math:%s--english:%s\\n\",sp->id,sp->name,(*sp).chinese,(*sp).math,(*sp).English);\r\n}\r\n\r\nint insert(FILE *fp,STU * s)\r\n{\r\n int ret;\r\n fseek(fp,0,SEEK_END);\r\n ret=fwrite(s,sizeof(STU),1,fp);\r\n if(ret!=1){\r\n printf(\"fwrite:%s\",strerror(errno));\r\n }\r\n return ret>0?0:1;\r\n}\r\n\r\nvoid reg_1_stu(FILE *fp)\r\n{\r\n STU s,buf;\r\n int dupFlag=0;\r\n\r\n printf(\"Please input stu info [id,name,chinese,math,english]\\n\");\r\n scanf(\"%d%s%s%s%s\",&s.id,&s.name,&s.chinese,&s.math,&s.English);\r\n printStu(&s);\r\n\r\n fseek(fp,0,SEEK_SET);\r\n while(fread(&buf,sizeof(STU),1,fp)==1)\r\n {\r\n if(s.id==buf.id)\r\n {\r\n dupFlag=1;\r\n break;\r\n }\r\n }\r\n\r\n if(dupFlag==1)\r\n {\r\n reg_1_stu(fp);\r\n }\r\n\r\n\r\n if(insert(fp,&s))\r\n {\r\n printf(\"reg_1_stu:insert error\\n\");\r\n printf(\"insert error\");\r\n };\r\n}\r\n\r\nvoid show(FILE *fp)\r\n{\r\n int i=0;\r\n STU buf;\r\n \r\n fseek(fp,0,SEEK_SET);\r\n while(fread(&buf,sizeof(STU),1,fp)==1)\r\n {\r\n \/\/printStu(&buf);\r\n printf(\"id:%d--name:%s--chinese:%s--math:%s--english:%s\\n\",buf.id,buf.name,buf.chinese,buf.math,buf.English);\r\n i++;\r\n }\r\n\r\n printf(\"total student number is %d\\n\",i);\r\n\r\n}\r\n\r\nint menu()\r\n{\r\n char sel;\r\n printf(\"\\n\\n----------------------------\\n\\n\");\r\n printf(\"1.reg\\n2.show\\n3\u641c\u7d22\\n4\u6392\u5e8f\\nq.quit\");\r\n printf(\"\\n\\n----------------------------\\n\\n\");\r\n do{\r\n sel=getchar(); \r\n }while(sel==10);\r\n \r\n return sel;\r\n}\r\n\r\nvoid search(char * name,FILE *fp)\r\n{\r\n STU s,buf;\r\n fseek(fp,0,SEEK_SET);\r\n size_t nameLen=sizeof(name);\r\n while(fread(&buf,sizeof(STU),1,fp)==1)\r\n {\r\n \/\/ printf(\"buf.name is : %s\\n\",buf.name);\r\n \/\/ printf(\"input name is : %s\\n\",name);\r\n if(strstr(buf.name,name)!=NULL)\r\n {\r\n printStu(&buf);\r\n }\r\n }\r\n}\r\n\r\nvoid sort(int index,FILE *fp)\r\n{\r\n STU *stuArr,s1,s2;\r\n\r\n int stuArrSize;\r\n int stuNum=0;\r\n\r\n stuArr=(STU *)malloc(100*sizeof(STU));\r\n fseek(fp,0,SEEK_SET);\r\n while(fread(stuArr+stuNum,sizeof(STU),1,fp)==1)\r\n {\r\n stuNum++;\r\n stuArrSize=sizeof(stuArr)\/sizeof(STU);\r\n if(stuNum>stuArrSize)\r\n {\r\n stuArr=(STU *)realloc(stuArr,sizeof(stuArr)+100*sizeof(STU));\r\n }\r\n }\r\n \/\/ switch(index)\r\n \/\/ {\r\n \/\/ case \"1\":\r\n \/\/ compareFun = compareChinese;\r\n \/\/ break;\r\n \/\/ case \"2\":\r\n \/\/ compareFun= compareMath;\r\n \/\/ break;\r\n \/\/ default:\r\n \r\n \/\/}\r\n printf(\"stuNum is %d\",stuNum);\r\n qsort(stuArr,stuNum,sizeof(STU),compar);\r\n\r\n for(int i=0;i<stuNum;i++)\r\n {\r\n printStu(&stuArr[i]);\r\n }\r\n\r\n\r\n \/\/ switch (index)\r\n \/\/ {\r\n \/\/ case '3':\r\n \r\n \/\/ break;\r\n \r\n \/\/ default:\r\n \/\/ break;\r\n \/\/ }\r\n}\r\n\r\nint compar(const void * s1,const void * s2)\r\n{\r\n STU * sa= (STU*)s1;\r\n STU * sb= (STU*)s2;\r\n\r\n if(atof(sa->chinese)-atof(sb->chinese)>0)\r\n {\r\n return 1;\r\n }\r\n else if(atof(sa->chinese)-atof(sb->chinese)==0)\r\n {\r\n return 0;\r\n }\r\n else\r\n {\r\n return -1;\r\n }\r\n \r\n}\r\n\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"1.c\u8bed\u8a00\u6c49\u5b57\u95ee\u9898 2.\u6587\u4ef6\u5b58\u50a8\uff1a\u4e00\u6b21\u6027\u8bfb\u5165\u6570\u7ec4\u5904\u7406; 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