学生成绩管理系统.doc

/*学生成绩管理系统*/#include #include #defineSWN 3 /* 课程数 */#define NAMELEN 20 /* 姓名最大字符数 */#define CODELEN 10 /* 学号最大字符数 */#define FNAMELEN 80 /* 文件名最大字符数 */#define BUFLEN 80 /* 缓冲区最大字符数 */* 课程名称表 */char schoolworkSWNNAMELEN+1 = Chinese,Mathematic,English;struct record char nameNAMELEN+1; /* 姓名 */ char codeCODELEN+1; /* 学号 */ int marksSWN; /* 各课程成绩 */ int total; /* 总分 */stu;int totalSWN; /* 各课程总分 */ /全局变量/ FILE *stfpt; /* 文件指针 */char stufFNAMELEN; /* 文件名 */* 从指定文件读入一个记录 */int readrecord(FILE *fpt,struct record *rpt) char bufBUFLEN; int i; if(fscanf(fpt,%s,buf)!=1) return 0;/* 文件结束 */ strncpy(rpt-name,buf,NAMELEN); fscanf(fpt,%s,buf); strncpy(rpt-code,buf,CODELEN); for(i=0;imarksi); for(rpt-total=0,i=0;itotal+=rpt-marksi; return 1;/* 对指定文件写入一个记录 */writerecord(FILE *fpt,struct record *rpt) int i; fprintf(fpt,%sn,rpt-name); fprintf(fpt,%sn,rpt-code); for(i=0;imarksi);/* 显示学生记录 */displaystu(struct record *rpt) int i; printf(nName : %sn,rpt-name); printf(Code : %sn,rpt-code); printf(Marks :n); for(i=0;imarksi); printf(Total : %4dn,rpt-total);/* 计算各单科总分 */int totalmark(char *fname) FILE *fp; struct record s; int count,i; if(fp=fopen(fname,r)=NULL) printf(Cant open file %s.n,fname); return 0; for(i=0;iSWN;i+) totali=0; count=0;while(readrecord(fp,&s)!=0) /注意函数参数的传递，地址传递 for(i=0;iSWN;i+) totali+=s.marksi; count+; fclose(fp);return count;/* 返回记录数 */* 列表显示学生信息 */void liststu(char *fname) FILE *fp; struct record s; if(fp=fopen(fname,r)=NULL) printf(Cant open file %s.n,fname); return ; while(readrecord(fp,&s)!=0) displaystu(&s); printf(n Press ENTER to continue.n); while(getchar()!=n); fclose(fp); return;/* 按学生姓名查找学生记录 */int retrievebyn(char *fname, char *key) FILE *fp;int c;struct record s;if(fp=fopen(fname,r)=NULL) printf(Cant open file %s.n,fname); return 0;c=0;while(readrecord(fp,&s)!=0) if(strcmp(,key)=0) displaystu(&s); c+; fclose(fp);if(c=0) printf(The student %s is not in the file %s.n,key,fname);return 1;/* 按学生学号查找学生记录 */int retrievebyc(char *fname, char *key) FILE *fp; int c; struct record s; if(fp=fopen(fname,r)=NULL) printf(Cant open file %s.n,fname); return 0;c=0;while(readrecord(fp,&s)!=0) if(strcmp(s.code,key)=0) displaystu(&s); c+; break; fclose(fp);if(c=0) printf(The student %s is not in the file %s.n,key,fname);return 1;main() int i,j,n;char c;char bufBUFLEN;FILE *fp;struct record s;printf(Please input the students marks record files name: );scanf(%s,stuf);if(fp=fopen(stuf,r)=NULL) printf(The file %s doesnt exit, do you want to creat it? (Y/N) ,stuf); getchar(); /吸收前面scanf语句的回车 c=getchar(); if(c=Y|c=y) fp=fopen(stuf,w); printf(Please input the record number you want to write to the file: ); scanf(%d,&n); for(i=0;in;i+) printf(Input the students name: ); scanf(%s,&); printf(Input the students code: ); scanf(%s,&s.code); for(j=0;jSWN;j+) printf(Input the %s mark: ,schoolworkj); scanf(%d,&s.marksj); writerecord(fp,&s); fclose(fp); fclose(fp);getchar();puts(Now you can input a command to manage the records.);puts(m : mean of the marks.);puts(t : total of the marks.);puts(n : search record by students name.);puts(c : search record by students code.);puts(l : list all the records.);puts(q : quit!);while(1) printf(Please input command:n); scanf( %c,&c);/* 输入选择命令 */ if(c=q|c=Q) puts(n Thank you for your using.); break; /* q，结束程序运行 */ switch(c) case m: /* 计算平均分 */ case M: if(n=totalmark(stuf)=0) /实际上是在测试程序 puts(Error!); break; printf(n); for(i=0;iSWN;i+) printf(%-15ss average is: %.2f.n,schoolworki,(float)totali/n); break; case t: /* 计算总分 */ case T: if(n=totalmark(stuf)=0) puts(Error!); break; printf(n); for(i=0;iSWN;i+) printf(%-15ss total mark is: %d.n,schoolworki,totali); break; case n: /* 按学生的姓名寻找记录 */ case N: printf(Please input the students name you want to search: ); scanf(%s,buf); retrievebyn(stuf,buf); break; case c: /