#include<stdio.h>
#include<string.h>

typedef struct 
{  char last_name[15];
   char first_name[15];
   double grade_point_index;
}student;
typedef struct
{  char last_name[15];
   char first_name[15];
   double salary;
}employee;

int 
main(){
	int num_student;
	int num_employee;
	int i,k,j;
	student arr_student[5],temp;
	employee  arr_employee[5],temp1;
	printf("\nEnter the number of students==>  ");
	scanf("%d", &num_student);
	for(i=0;i<num_student;i++)
	{printf("\nEnter the last name of student %d==>",i+1 );
	scanf("%s",arr_student[i].last_name);
	printf("\nEnter the first name of student %d==>",i+1 );
	scanf("%s",arr_student[i].first_name);
	printf("\nEnter the grade point index of student %d==>",i+1 );
	scanf("%lf",&arr_student[i].grade_point_index);}
	
	
	for (k = 0; k <num_student; ++k)
		for (j = k+1; j <num_student; ++j){
			if (strcmp(arr_student[k].last_name,arr_student	[j].last_name)>0){
				temp=arr_student[k];
				arr_student[k]=arr_student[j];
				arr_student[j]=temp;}
			else if (strcmp(arr_student[k].last_name,arr_student[j].last_name)==0){
					if (strcmp(arr_student[k].first_name,arr_student[j].first_name)>0){
					temp=arr_student[k];
					arr_student[k]=arr_student[j];
					arr_student[j]=temp;}}
		}
	printf("Students' records \t last name \t first name \t grade point index  \n");
	for(i=0;i<num_student;i++)
	printf("                 \t %-8s    \t %-8s      \t %-8.2f \n",arr_student[i].last_name,arr_student[i].first_name,arr_student[i].grade_point_index);  


	printf("Enter the number of employees==>  ");
	scanf("%d", &num_employee);
	for(i=0;i<num_employee;i++)
	{printf("\nEnter the last name of employee %d==>",i+1 );
	scanf("%s",arr_employee[i].last_name);
	printf("\nEnter the first name of employee %d==>",i+1 );
	scanf("%s",arr_employee[i].first_name);
	printf("\nEnter the salary of employee %d==>",i+1 );
	scanf("%lf",&arr_employee[i].salary);
	}

	for (k = 0; k <num_employee; ++k)
		for (j = k+1; j <num_employee	; ++j){
			if (strcmp(arr_employee	[k].last_name,arr_employee[j].last_name)>0){
				temp1=arr_employee[k];
				arr_employee[k]=arr_employee[j];
				arr_employee[j]=temp1;}
			else if (strcmp(arr_employee[k].last_name,arr_employee[j].last_name)==0){
					if (strcmp(arr_employee	[k].first_name,arr_employee	[j].first_name)>0){
					temp1=arr_employee[k];
					arr_employee[k]=arr_employee[j];
					arr_employee[j]=temp1;}}
		}

	printf("\nThe Employees' records that you have entered are:  \n\n");
	printf("Employees' records \t last name \t first name \t salary  \n");
	for(i=0;i<num_employee;i++)
		printf("                 \t %-8s    \t %-8s      \t %-8.2f \n",arr_employee[i].last_name,arr_employee[i].first_name,arr_employee[i].salary);
for(i=0;i<num_student;i++)
	{for(j=0; j<num_employee; j++)
		if(strcmp(arr_employee[j].last_name,arr_student[i].last_name)==0 && strcmp(arr_employee[j].first_name,arr_student[i].first_name)==0)
			if(arr_student[i].grade_point_index>3)
				arr_employee[j].salary= arr_employee[j].salary * 1.10;}

printf("\n\nThe emplyees' salary after the increase: \n \n");
printf("Employees' records \t last name \t first name \t salary  \n");
	for(i=0;i<num_employee;i++)
		printf("                 \t %-8.3s    \t %-8s      \t %-8.3f \n",arr_employee[i].last_name,arr_employee[i].first_name,arr_employee[i].salary);
				
	return (0);
}

#include<stdio.h>
#include<string.h>
typedef struct 
{  char last_name[15];
   char first_name[10];
   double grade_point_index;
}student;
typedef struct
{  char last_name[15];
   char first_name[15];
   double salary;
}employee;

int 
main(){
	FILE *cfPtr;
	int num_student;
	int num_employee;
	int i,k,j;
	student arr_student[5],temp;
	employee  arr_employee[5],temp1;
	
	if( ( cfPtr = fopen("file.dat", "wb+") ) == NULL )
		printf("couldn't open the file\a\a\a");
    else{	
	
	printf("\nEnter the number of students==>  ");
	scanf("%d", &num_student);
	for(i=0;i<num_student;i++)
	{printf("\nEnter the last name of student %d==>",i+1 );
	scanf("%s",arr_student[i].last_name);
	printf("\nEnter the first name of student %d==>",i+1 );
	scanf("%s",arr_student[i].first_name);
	printf("\nEnter the grade point index of student %d==>",i+1 );
	scanf("%lf",&arr_student[i].grade_point_index);}
	
	
	for (k = 0; k <num_student; ++k)
		for (j = k+1; j <num_student; ++j){
			if (strcmp(arr_student[k].last_name,arr_student	[j].last_name)>0){
				temp=arr_student[k];
				arr_student[k]=arr_student[j];
				arr_student[j]=temp;}
			else if (strcmp(arr_student[k].last_name,arr_student[j].last_name)==0){
					if (strcmp(arr_student[k].first_name,arr_student[j].first_name)>0){
					temp=arr_student[k];
					arr_student[k]=arr_student[j];
					arr_student[j]=temp;}}
		}
	printf("Students' records \t last name \t first name \t grade point index  \n");
	for(i=0;i<num_student;i++)
	printf("                 \t %-8s    \t %-8s      \t %-8.2f \n",arr_student[i].last_name,arr_student[i].first_name,arr_student[i].grade_point_index);  
    }
    fclose(cfPtr);
}