#include<stdio.h>
#include<stdlib.h>
// Simple Program to demonstrate the sentinel operation.
int main()
{
int cusno;
char first[13];
char last[15];
printf("Please enter a customer no to begin:(Press -1 to terminate \n");
scanf("%d",&cusno);//testing condition or primer.
while(cusno!= -1) //while loop to test condition
{
printf("Please enter the first name of customer:");
scanf("%s",first);
printf("Please enter the last name of customer:");
scanf("%s",last);
printf("Please enter a customer no to begin:(Press -1 to terminate \n");
scanf("%d",&cusno); //second statement to provide the escape condition to the loop.
}
if(cusno== -1)
{
printf("Program exited successfully\n");
system("pause");
exit(0);
}
return 0 ;
}