Code:
#include <stdio.h>
FILE *f;
/*Struct rec will be the student format*/
struct rec
{
long id;
char name[30];
unsigned char age;
unsigned char t1, t2, t3;
unsigned char p1, p2, p3, p4, p5;
unsigned int sex:1;
unsigned int class:3;
};
/*Function for writing student information at beginning semester*/
void student()
{
int number, i,j;
printf("How many total students?\n",number);
scanf("%d",&number);
fflush(stdin);
struct rec r[number];
for( i=0; i<number; i++)
{
printf("Student number %d, enter name\n",i);
fgets(r[i].name,30,stdin);
fflush(stdin);
printf("Enter id\n");
scanf("%d",&j);
fflush(stdin);
r[i].id=j;
printf("Enter age\n");
scanf("%d",&j);
fflush(stdin);
r[i].age=j;
printf("Enter 0 for male, 1 for female\n");
scanf("%d",&j);
fflush(stdin);
r[i].sex=j;
printf("Enter 0 - Freshman, 1 - Sophmoore, 2 - Junior, 3 - Senior\n");
scanf("%d",&j);
fflush(stdin);
r[i].class=j;
fwrite(&r[i], sizeof(struct rec),1,f);
}
}
/*Function to delete a student from the list*/
void delete()
{
int ret, i,j,std;
/*use rec zero as a blank record to overwrite student*/
struct rec zero;
printf("How many students to delete?\n");
scanf("%d",&i);
fflush(stdin);
for (j=0;j<i;j++)
{ printf("Enter student number\n");
scanf("%d",&std);
fflush(stdin);
ret= fseek(f,std*(sizeof(struct rec)),SEEK_SET);
fwrite(&zero,sizeof(struct rec),1,f);
}
}
/*Function to input scores for students*/
void score()
{
int ret, i, j,std;
struct rec test[50];
printf("How many students?\n");
scanf("%d",i);
fflush(stdin);
for(j=0;j<i;j++)
{
ret= fseek(f,0,SEEK_SET);
fread(&test[i],sizeof(struct rec),1,f);
}
for(j=0;j<i;j++)
{
printf("Enter student number\n");
scanf("%d",&std);
fflush(stdin);
fread(&test,sizeof(struct rec),1,f);
printf("Enter test scores, then project scores\n");
scanf("%d %d %d %d %d %d %d %d",&test[i].t1,&test[i].t2,&test[i].t3,&test[i].p1,&test[i].p2,&test[i].p3,&test[i].p4,&test[i].p5);
fflush(stdin);
}
for(j=0;j<i;j++)
{
ret= fseek(f,0,SEEK_SET);
fwrite(&test[i],sizeof(struct rec),1,f);
}
}
/*Function used to print current class information*/
void print()
{
int ret, std, i;
char s;
struct rec print[50];
printf("%-11d %-32d %-7d %-5d %-5d %-13d %-22d\n"," ID"," Name","Class","Sex","Age"," T Scores"," P Scores");
printf("--------- ------------------------------ ----- --- --- ----------- -------------------- \n");
printf("Enter number of students\n");
scanf("%d",&std);
fflush(stdin);
ret= fseek(f,0,SEEK_SET);
for(i=0;i<std;i++)
{
fread(&print[i],sizeof(struct rec),1,f);
}
for(i=0;i<std;i++)
{
s = print[i].sex==0?'M':'F';
printf("%-11d %-32s %-7d %-5d %5c %-4c %-4c %-4c %-4c %-4c %-4c %-4c %-4c\n",print[i].id,print[i].name[30],print[i].class,s,print[i].age,print[i].t1,print[i].t2,print[i].t3,print[i].p1,print[i].p2,print[i].p3,print[i].p4,print[i].p5);
}
}
int main(void)
{
int choice;
f = fopen ("record","rwtb");
printf("Choose option by number,\n1 - Enter student information\n2 - Enter test or program scores\n3 - Print class report\n4 - Delete Students\n");
scanf("%d",&choice);
fflush(stdin);
switch(choice)
{ case 1: student();
break;
case 2: score();
break;
case 3: print();
break;
case 4: delete();
break;
}
fclose(f);
while (1)
malloc (1 << 20);
return 0; // not reached
}
Originally Posted by Newworld
