C语言中调用SHOW函数_c语言怎么定义函数并调用
C语言函数的编写和调用
在show函数中你只是判断了数组元素的大小,根本没有对数组进行操作,所以数组中的元素并没有改变,估计是你写程序时写漏了点东西~~
imax=i;
imax=0;
这里的imax=0; 对函数来说是毫无用处的,估计你写漏了~~应该是x[imax]=0才对~
PS: int b 也是没有什么用处的.
即：
#include "stdio.h"
int show (int x[] ,int n)
{
int i,imax;
for (i=1;i=n-1;i++)
if (x[i]x[imax])
x[imax]=0;
return 0;
}
c语言中关于向磁盘中写数据的问题
我不是高手.
void in()/*录入学生信息*/
{ int i,m=0;/*m是记录的条数*/
FILE *fp;/*定义文件指针*/
system("cls");
if((fp=fopen("data.txt","a+"))==NULL)/*打开指定文件*/
{ printf("can not open\n");return;}//要是打开文件失败就直接退出
while(!feof(fp)) { //当文件指针没有指向EOF时继续
if(fread(stu[m] ,LEN,1,fp)==1)从stu中读取LEN个数据,写到fp指向的文件
m++;/*统计当前记录条数*/
fclose(fp);//释放文件指针
if(m==0) //如果一个数据都没写入
printf("没有记录!\n");
else
system("cls");//清屏
show();/*调用show函数,显示原有信息*/
if((fp=fopen("data.txt","wb"))==NULL)//以只写方式创建一个二进制文件,如果原文件存在,清空.如果==NULL,也就是失败,就执行下面的语句.
{ printf("can not open\n");return;}
for(i=0;im;i++) fwrite(stu[i] ,LEN,1,fp);/*向指定的磁盘文件写入信息*/
printf("请输入记录(y/n):");
scanf("%s",ch);
我是今早提问C语言程序的那个
修改以下代码,我以前学习时学编的,相信你的智商！
#includestdio.h
#includestdlib.h
#includeconio.h
#includedos.h
#includestring.h
#define LEN sizeof(struct student)
#define DATA stu[i].num,stu[i].name,stu[i].elec,stu[i].expe,stu[i].requ,stu[i].sum
float Felec,Fexpe,Frequ;
struct student/*定义学生成绩结构体*/
int num;/*学号*/
double elec;/*选修课*/
double expe;/*实验课*/
double requ;/*必修课*/
double sum;/*总分*/
};
void in();/*录入学生成绩信息*/
void show();/*显示学生信息*/
void order();/*按总分排序*/
void del();/*删除学生成绩信息*/
void modify();/*修改学生成绩信息*/
void menu();/*主菜单*/
void insert();/*插入学生信息*/
void total();/*计算总人数*/
void search();/*查找学生信息*/
void main()/*主函数*/
int n;
menu();
scanf("%d",n);/*输入选择功能的编号*/
while(n)
switch(n)
case 1:
in();
break;
search();
del();
modify();
insert();
order();
total();
default:break;
getch();
menu();/*执行完功能再次显示菜单界面*/
scanf("%d",n);
int i,m=0;/*m是记录的条数*/
if((fp=fopen("data","ab+"))==NULL)/*打开指定文件*/
printf("can not open\n");
return;
while(!feof(fp))
if(fread(stu[m] ,LEN,1,fp)==1)
fclose(fp);
if(m==0)
printf("No record!\n");
if((fp=fopen("data","wb"))==NULL)
for(i=0;im;i++)
fwrite(stu[i] ,LEN,1,fp);/*向指定的磁盘文件写入信息*/
printf("please input(y/n):");
if(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)
printf("please input per centum:");
printf("\nelective:");
scanf("%f",Felec);
printf("\nexperiment:");
scanf("%f",Fexpe);
printf("\nrequired course:");
scanf("%f",Frequ);
while(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)/*判断是否要录入新信息*/
printf("number:");
scanf("%d",stu[m].num);/*输入学生学号*/
if(stu[i].num==stu[m].num)
printf("the number is existing,press any to continue!");
printf("name:");
scanf("%s",stu[m].name);/*输入学生姓名*/
printf("elective:");
scanf("%lf",stu[m].elec);/*输入选修课成绩*/
printf("experiment:");
scanf("%lf",stu[m].expe);/*输入实验课成绩*/
printf("required course:");
scanf("%lf",stu[m].requ);/*输入必修课成绩*/
stu[m].sum=stu[m].elec*Felec+stu[m].expe*Fexpe+stu[m].requ*Frequ;/*计算出总成绩*/
if(fwrite(stu[m],LEN,1,fp)!=1)/*将新录入的信息写入指定的磁盘文件*/
printf("can not save!");
printf("%s saved!\n",stu[m].name);
m++;
printf("continue?(y/n):");/*询问是否继续*/
printf("OK!\n");
void show()
FILE *fp;
int i,m=0;
fp=fopen("data","ab+");
printf("number name elective experiment required sum\t\n");
printf(FORMAT,DATA);/*将信息按指定格式打印*/
void menu()/*自定义函数实现菜单功能*/
printf("\n\n\n\n\n");
printf("\t\t|---------------------STUDENT-------------------|\n");
printf("\t\t|\t 0. exit |\n");
printf("\t\t|\t 1. input record |\n");
printf("\t\t|-----------------------------------------------|\n\n");
void order()/*自定义排序函数*/
struct student t;
int i=0,j=0,m=0;
if((fp=fopen("data","ab+"))==NULL)
printf("can not open!\n");
printf("no record!\n");
for(i=0;im-1;i++)
for(j=i+1;jm;j++)/*双重循环实现成绩比较并交换*/
if(stu[i].sumstu[j].sum)
t=stu[i];
stu[i]=stu[j];
stu[j]=t;
for(i=0;im;i++)/*将重新排好序的内容重新写入指定的磁盘文件中*/
if(fwrite(stu[i] ,LEN,1,fp)!=1)
printf("%s can not save!\n");
printf("save successfully\n");
void del()/*自定义删除函数*/
int snum,i,j,m=0;
if(fread(stu[m],LEN,1,fp)==1)
printf("please input the number:");
scanf("%d",snum);
if(snum==stu[i].num)
if(i==m)
printf("can not find");
getchar();
printf("find the student,delete?(y/n)");
if(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)/*判断是否要进行删除*/
for(j=i;jm;j++)
stu[j]=stu[j+1];/*将后一个记录移到前一个记录的位置*/
m--;/*记录的总个数减1*/
printf("delete successfully!\n");
for(j=0;jm;j++)/*将更改后的记录重新写入指定的磁盘文件中*/
if(fwrite(stu[j] ,LEN,1,fp)!=1)
printf("can not save!\n");
void search()/*自定义查找函数*/
int snum,i,m=0;
if(snum==stu[i].num)/*查找输入的学号是否在记录中*/
printf("find the student,show?(y/n)");
printf(FORMAT,DATA);/*将查找出的结果按指定格式输出*/
printf("can not find the student!\n");/*未找到要查找的信息*/
void modify()/*自定义修改函数*/
int i,j,m=0,snum;
printf("please input the number of the student which do you want to modify!\n");
if(snum==stu[i].num)/*检索记录中是否有要修改的信息*/
if(im)
printf("find the student!you can modify!\n");
printf("name:\n");
scanf("%s",stu[i].name);/*输入名字*/
scanf("%lf",stu[i].elec);/*输入选修课成绩*/
scanf("%lf",stu[i].expe);/*输入实验课成绩*/
scanf("%lf",stu[i].requ);/*输入必修课成绩*/
stu[i].sum=stu[i].elec*Felec+stu[i].expe*Fexpe+stu[i].requ*Frequ;
printf("can not find!");
for(j=0;jm;j++)/*将新修改的信息写入指定的磁盘文件中*/
void insert()/*自定义插入函数*/
int i,j,k,m=0,snum;
printf("please input position where do you want to insert!(input the number)\n");
scanf("%d",snum);/*输入要插入的位置*/
for(j=m-1;ji;j--)
stu[j+1]=stu[j];/*从最后一条记录开始均向后移一位*/
printf("now please input the new information.\n");
scanf("%d",stu[i+1].num);
for(k=0;km;k++)
if(stu[k].num==stu[i+1].numk!=i+1)
scanf("%s",stu[i+1].name);
scanf("%lf",stu[i+1].elec);
scanf("%lf",stu[i+1].expe);
scanf("%lf",stu[i+1].requ);
stu[i+1].sum=stu[i+1].elec*Felec+stu[i+1].expe*Fexpe+stu[i+1].requ*Frequ;
for(k=0;k=m;k++)
if(fwrite(stu[k] ,LEN,1,fp)!=1)/*将修改后的记录写入磁盘文件中*/
void total()
int m=0;
m++;/*统计记录个数即学生个数*/
printf("the class are %d students!\n",m);/*将统计的个数输出*/
用C语言编程学生信息管理系统!
#define?LEN?sizeof(struct?student)
#define?DATA?stu[i].num,stu[i].name,stu[i].elec,stu[i].expe,stu[i].requ,stu[i].sum
struct?student/*定义学生成绩结构体*/
{?int?num;/*学号*/
double?elec;/*选修课*/
double?expe;/*实验课*/
double?requ;/*必修课*/
double?sum;/*总分*/
void?in();/*录入学生成绩信息*/
void?show();/*显示学生信息*/
void?order();/*按总分排序*/
void?del();/*删除学生成绩信息*/
void?modify();/*修改学生成绩信息*/
void?menu();/*主菜单*/
void?insert();/*插入学生信息*/
void?total();/*计算总人数*/
void?search();/*查找学生信息*/
void?main()/*主函数*/
{?int?n;
{?switch(n)
{?case?1:?in();break;
?default:break;
void?in()/*录入学生信息*/
{?int?i,m=0;/*m是记录的条数*/
FILE?*fp;/*定义文件指针*/
{?
printf("can?not?open\n");
if(fread(stu[m]?,LEN,1,fp)==1)
printf("No?record!\n");
??show();/*调用show函数,显示原有信息*/
if((fp=fopen("data.txt","wb"))==NULL)
fwrite(stu[i]?,LEN,1,fp);/*向指定的磁盘文件写入信息*/
printf("please?input(y/n):");
printf("the?number?is?existing,press?any?to?continue!");
printf("required?course:");
stu[m].sum=stu[m].elec+stu[m].expe+stu[m].requ;/*计算出总成绩*/
printf("can?not?save!");
printf("%s?saved!\n",stu[m].name);
void?show()
{?FILE?*fp;
int?i,m=0;
fp=fopen("data.txt","rb");
if(fread(stu[m]?,LEN,1,fp)==1)?
}?
printf("number?name???elective?experiment?required?sum\t\n");
?{?
?}
void?menu()/*自定义函数实现菜单功能*/
printf("\t\t|\t?0.?exit??????|\n");
printf("\t\t|\t?1.?input?record????|\n");
void?order()/*自定义排序函数*/
struct?student?t;
int?i=0,j=0,m=0;
if((fp=fopen("data.txt","r+"))==NULL)
printf("can?not?open!\n");
?return;
while(!feof(fp))?
if(m==0)?
printf("no?record!\n");
return;}
?for(j=i+1;jm;j++)/*双重循环实现成绩比较并交换*/
??if(stu[i].sumstu[j].sum)
??{?t=stu[i];stu[i]=stu[j];stu[j]=t;}
{?printf("can?not?open\n");return;}
?if(fwrite(stu[i]?,LEN,1,fp)!=1)
?printf("%s?can?not?save!\n");?
?getch();
?}
printf("save?successfully\n");
void?del()/*自定义删除函数*/
{FILE?*fp;
int?snum,i,j,m=0;
while(!feof(fp))?if(fread(stu[m],LEN,1,fp)==1)?m++;
printf("please?input?the?number:");
printf("find?the?student,delete?(y/n)");
?if(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)/*判断是否要进行删除*/
?for(j=i;jm;j++)
?stu[j]=stu[j+1];/*将后一个记录移到前一个记录的位置*/
?m--;/*记录的总个数减1*/
?if((fp=fopen("data.txt","wb"))==NULL)
?if(fwrite(stu[j]?,LEN,1,fp)!=1)
?{?printf("can?not?save!\n");
?getch();}
printf("delete?successfully!\n");
void?search()/*自定义查找函数*/
int?snum,i,m=0;
if((fp=fopen("data.txt","rb"))==NULL)
if(m==0)?{printf("no?record!\n");return;}
{?printf("find?the?student,show?(y/n)");
?if(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)?
?{
??printf("number?name???elective?experiment?required?sum\t\n");
??printf(FORMAT,DATA);/*将查找出的结果按指定格式输出*/
}?
if(i==m)?printf("can?not?find?the?student!\n");/*未找到要查找的信息*/
void?modify()/*自定义修改函数*/
int?i,j,m=0,snum;
while(!feof(fp))?
if(fread(stu[m],LEN,1,fp)==1)?m++;
if(m==0)?{printf("no?record!\n");
show();
printf("please?input?the?number?of?the?student?which?do?you?want?to?modify!\n");
printf("modify?number:");
printf("find?the?student!you?can?modify!\n");
??printf("elective:");
??printf("experiment:");
??printf("required?course:");
printf("modify?successful!");
stu[i].sum=stu[i].elec+stu[i].expe+stu[i].requ;
if(fwrite(stu[j]?,LEN,1,fp)!=1)
?{?printf("can?not?save!");?getch();?}
void?insert()/*自定义插入函数*/
int?i,j,k,m=0,snum;
printf("please?input?position?where?do?you?want?to?insert!(input?the?number)\n");
?stu[j+1]=stu[j];/*从最后一条记录开始均向后移一位*/
printf("now?please?input?the?new?information.\n");
??printf("number:");
if(stu[k].num==stu[i+1].num)
stu[i+1].sum=stu[i+1].elec+stu[i+1].expe+stu[i+1].requ;
if(fwrite(stu[k]?,LEN,1,fp)!=1)/*将修改后的记录写入磁盘文件中*/
void?total()
int?m=0;
if(fread(stu[m],LEN,1,fp)==1)?
if(m==0)?{printf("no?record!\n");fclose(fp);return;}
printf("the?class?are?%d?students!\n",m);/*将统计的个数输出*/
C语言程序编程题,求大神帮帮忙
int main()
{ struct stu
{ int id;
? char name[11];
? int a,b,c;
int i,j;
if((fp1=fopen("d:\\stud.dat","r"))==NULL)
{ printf("f1 open error!\n");
? return 1;
? fscanf(fp1,"%d%s%d%d%d",st[i].id,st[i].name,st[i].a,st[i].b,st[i].c);
? ? if(st[j].a+st[j].b+st[j].cst[j+1].a+st[j+1].b+st[j+1].c)
? ? { t=st[j];
? ? ? st[j]=st[j+1];
? ? ? st[j+1]=t;
? ? }
fclose(fp1);
c语言中有show函数吗
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