C语言课程设计报告_学生成绩管理系统

 void DrawSnow()
{int i;
 int sx[62];
 randomize();
 for(i=0;i<62;i++)
  sx[i]=(i+2)*10;
 cleardevice();
 while(!kbhit())
 {
  Pr();
  if(snownum!=100)
  {
   snow[snownum].speed=2+random(5);
   i=random(62);
   snow[snownum].x=sx[i];
   snow[snownum].y=10-random(100);
  }
  for(i=0;i   putimage(snow[i].x,snow[i].y,save2,COPY_PUT);
   Pr();
  if(snownum!=100)
   snownum++;
  /*delay(300);*/
  setfillstyle(SOLID_FILL,15);
  for(i=0;i   {
    snow[i].y+=snow[i].speed;
    putimage(snow[i].x,snow[i].y,save1,COPY_PUT);
    if(snow[i].y>500)
    snow[i].y=10-random(200);
   }
  change++;
  if(change==140)
  change=10;
  }
  nosound();
}
2学生成绩管理系统（自己设计界面）
 #define N 1
struct student
{char num[10];
 char name[10];
 int score[4];
 float ave;
 }stu[N];
main()
{int i,j,max,maxi,sum;
 float average;
 for(i=0;i {printf("Please input scores of student %d :\n",i+1);
  printf("NO.:");
  scanf("%s",stu[i].num);
  printf("name:");
  scanf("%s",stu[i].name);
  for(j=0;j<3;j++)
  {printf("score %d :",j+1);
   scanf("%d",&stu[i].score[j]);
  }
 }
 average=0;
 max=0;
 maxi=0;
 for(i=0;i {sum=0;
  for(j=0;j<3;j++)
   sum+=stu[i].score[j];
  stu[i].ave=sum/3.0;
  average+=stu[i].ave;
 if(sum>max)
  {max=sum;
   maxi=i;
  }
 }
 average/=N;
 printf("   NO.     name   score1   score2   score3   average\n");
 for(i=0;i {printf("%5s",stu[i].num);
  printf("%10s",stu[i].name);
  for(j=0;j<3;j++)
   printf("%9d",stu[i].score[j]);
  printf("%8.2f\n",stu[i].ave);
 }
 printf("average=%6.2f\n",average);
 printf("The highest score is : %s,score total :%d\n",stu[maxi].name,max);
 getch();
}
 
 
3．异或加密与解密
#include
#include
#include
#include
 
void jiami(char *in,char *pwd,char *out);
void main(int argc,char *argv[])
{
 char in[30];
 char out[30];
 char pwd[8];
 if(argc!=4)
 {
  printf("\Input file name:\n");
  gets(in);
  printf("Please enter password:\n");
  gets(pwd);
  printf("Output file name:\n");
  gets(out);
  jiami(in,pwd,out);
 }
 else
 {
  strcpy(in,argv[1]);
  strcpy(pwd,argv[2]);
  strcpy(out,argv[3]);
  jiami(in,pwd,out);
 }
}
void jiami(char *in,char *pwd,char *out_file)
{
 FILE *fp1,*fp2;
 register char ch;
 int j=0;
 int k=0;
 fp1=fopen(in,"rb");
 if(fp1==NULL)
 {
  printf("Cannot open in-file!\n");
  exit(1);
 }
 fp2=fopen(out_file,"wb");
 if(fp2==NULL)
 {
  printf("Cannot open or create output-file!\n");
  exit(1);
 }
 while(pwd[++k]);
 ch=fgetc(fp1);
 while(!feof(fp1))
 {
  fputc(ch^pwd[j>=k?j=0:j++],fp2);
  ch=fgetc(fp1);
 }
 fclose(fp1);
 fclose(fp2);
}