Thread: prevent duplicate age when insert age

i'm newbie in c programming langauge


i created program that insert employes data and then print their data

but never accept duplicate age if user entered duplicated age promot him to enter another age (age must be unique)


here is my code

Code:

#include<conio.h>
#include<stdio.h>
#define size 3


  struct emp
  {
	int age,overtime,dedcution,netsal;
	float salary;
	char  firstname[15];
	char  lastname[15];


  };
  int main()
   {
	  int i,j,unq=1,arr[3]={0};
	  float temp=0.0;
	  struct emp employes[3];
	  clrscr();
	  printf("please insert data of employee\n");
	  for(i=0;i<size;i++)
	  {




		 clrscr();


		 gotoxy(5,2);
		 printf("firstname");
		 gotoxy(40,2);
		 printf("lastname");
		 gotoxy(5,4);
		 printf("age");
		 gotoxy(40,4);
		 printf("salary");
		 gotoxy(5,6);
		 printf("overtime");
		 gotoxy(40,6);
		 printf("nset salary");
		 gotoxy(16,2);
		 scanf("%s", employes[i].firstname);
		 gotoxy(50,2);
		 scanf("%s",employes[i].lastname);


		 gotoxy(10,4);
		 scanf("%d",&employes[i].age);


		 arr[0]=employes[0].age;
		 for(j=i+1;j<size;j++)
		   {
			  if(arr[i] == employes[j].age )
			   {
					  unq=0;
					 break;
			   }


		   }
		   if(unq==0)
			{
			   gotoxy(10,4);
			   scanf("%d",&employes[i].age);


			}else{
			 arr[i]=employes[i+1].age;
			}
		 /*
		 for(j=i+1;j<size;j++)
		  {


			if(arr[i] == employes[j].age)
			  {
				unq=0;
				break;
			  }
		  }
		 if(!unq) unq=1; goto Ask;
		 */
		 gotoxy(50,4);


		 scanf("%f",&temp);
		// employes[i].salary=0;
		 employes[i].salary =temp;
		 gotoxy(20,6);
		 scanf("%d",&employes[i].overtime);
		 gotoxy(55,6);
		 scanf("%d",&employes[i].netsal);


	   }
	   clrscr();
	  for(i=0;i<size;i++)
	   {
		  printf("first name :\t %s \n",employes[i].firstname);
		  printf("last name :\t %s \n ",employes[i].lastname);
		  printf("age:\t %d \n",employes[i].age);
		  printf("salary:\t %f \n",employes[i].salary);
		  printf("overtime:\t %d \n",employes[i].overtime);
		  printf("netsal :\t %d \n",employes[i].netsal);
		  printf("\n _______________________ \n");
	   }


	  getch();
	 return 0;
   }

i want to insert only one employe from each age not all ages

For a small set like age I would just use an array of char

Code:

int
have_seen_age(unsigned int age)
{
   static char  age_used[128] = { 0 };
   
   if((age > 127 ) || age_used[age]) 
      return(1);
   age_used[age] = 1;
   return(0);
}