thanx for UR help, i realy appreciate it .
i only can use the programe once for one operation only, if i wanna call another operation as inserting a student info. again .. a new problem apears ?!
/**************************************************************/
/* Assigment 2 */
/* Computer Programming 206 \ 01a */
/* By : Sara Abdullah Al-AQeel , ID : 206114181 */
/* */
/* This Program prompt the user to enter an operation code, */
/* then calls a function to perform the requested action. */
/* Repeat until the user the command'Q'. */
/* */
/**************************************************************/
#include <stdio.h>
#include <string.h>
typedef struct record {
int ID;
char fname[30];
char lname[30];
float midterm;
float final;
} student;
/*************************************************************/
/* This void Function allow the user to insert a new student */
/* record into array,the function checks first if the record */
/* is already in the array by comparing the new ID with all */
/* IDs in list. */
/*************************************************************/
void insert_record( student a[], int *n )
{
int ID;
printf("Enter a student ID to insert : ");
scanf("%d",&ID);
printf("check for record in the array ..\n");
if( ID>0 && *n<100 )
{
if( a[*n].ID==ID )
printf("Record is already inserted");
else
{
a[*n].ID=ID;
printf("Enter student's first name : ");
scanf("%s",a[*n].fname);
printf("Enter student's last name : ");
scanf("%s",a[*n].lname);
printf("Enter student's midterm grade : ");
scanf("%f",&a[*n].midterm);
printf("Enter student's final grade : ");
scanf("%f",&a[*n].final);
}
}
}
/*************************************************************/
/* This void Function delete a student record using ID, then */
/* shift the array to fill up the gap created by the deleted */
/* record. */
/*************************************************************/
void delete_record( student a[], int *n )
{
int ID, i, pos;
printf("Enter a student ID to delete : ");
scanf( "%d",&ID );
for ( i=0; i<*n; ++i )
if( a[i].ID==ID )
pos=i;
for( i=pos; i<*n-1; ++i)
a[i]=a[i+1];
(*n)--;
}
/*************************************************************/
/* This void Function print the average of final exam . */
/*************************************************************/
void average( student a[], int n )
{
float avg;
float sum=0;
int i;
for( i=0; i<n; ++i )
sum=sum+a[i].final;
avg=sum/n;
printf("The average of final = %f \n", avg );
}
/*************************************************************/
/* This Function of student type print the smallest& largest */
/* score of the final exam . */
/*************************************************************/
void smallest_largest( student a[], int n, float *L, float *S )
{
int flag=0;
if( n==-1 )
return;
else
{
if( flag==0)
{
*L=a[n].final;
*S=a[n].final;
flag=1;
}
else
{
if( *L<a[n].final )
*L=a[n].final;
else if( *S>a[n].final )
*S=a[n].final;
smallest_largest(a,n-1,L,S);
}
}
}
/*************************************************************/
/* This void Function sort the array by descending order */
/* according to the first name . */
/*************************************************************/
void sort_record( student a[], int n )
{
student temp;
int i, j, pos;
for( i=0; i<n; ++i )
{
temp=a[i];
pos=i;
for( j=i+1; j<n; ++j )
if( strcmp(a[j].fname,temp.fname)==1 )
{
temp=a[i];
pos=j;
}
a[pos]=a[i];
a[i]=temp;
}
}
/*************************************************************/
/* The MAIN function, calls all functions . */
/*************************************************************/
main()
{
student a[100];
char ch;
int n=0;
float L,S;
printf( "Enter an operation code: \n");
printf("1) I, to insert a new record. \n");
printf("2) D, to delete a record from the array. \n");
printf("3) F, to print the average of final exam. \n");
printf("4) C, to print the smallest & largest of the final exam. \n");
printf("5) S, to sort the array by descending order according to first name .\n");
printf("6) Q, to quit the program. \n");
scanf("%c",&ch);
while( ch!='Q'&&ch!='q' )
{
if( ch=='I'||ch=='i' )
insert_record(a,&n);
else if( ch=='D'||ch=='d')
delete_record(a,&n);
else if( ch=='F'||ch=='f')
average(a,n);
else if( ch=='C'||ch=='c')
{
smallest_largest(a,n,&L,&S);
printf("The Largest score of final exam = %f\n",&L);
printf("The smallest score of final exam = %f\n",&S);
}
else if( ch=='S'||ch=='s')
sort_record(a,n);
else
printf("Undefined operation code !!! \n");
printf("please, Try another operation code \n");
scanf(" %c",ch);
}
return 0;
}
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