Question

Write a C program which creates a template for a structure to store somebody's date of birth (day, month, and year). Then write a C function that takes two such structure, one which represents the date of birth, and the other today's date, and returns the age of the user in years. Your function can either provide the full year only (integer) or the floating point age (bonus marks).

Next, write a C program which asks the user to enter their name and date of birth (day, month and year, and then stores this in the structure defined above. Your program should then determine the user's age by calling the function, then display to the screen whether the user is legally permitted to drink alcohol (18 years old or above).

Answer 1

#include <stdio.h>

struct date{
int day;
int month;
int year;
};
int calculateAge(struct date a,struct date b){
return b.year-a.year;
}
int main()
{
char arr[100];
printf("Enter your name: ");
gets(arr);
struct date a,b;
printf("Enter day of birth: ");
scanf("%d",&a.day);
printf("Enter month of birth: ");
scanf("%d",&a.month);
printf("Enter year of birth: ");
scanf("%d",&a.year);
  
b.day=8;b.month=10;b.year=2019;
if(calculateAge(a,b)>=18){
printf("You are legally permitted to drink alcohol.")
}
else{
printf("You are not permitted to drink alcohol.");
}
return 0;
}

The output is

input Enter your name: Chris H Enter day of birth: 13 Enter month of birth: 1 Enter year of birth: 1998 You are legally permitted to drink alcohol. . Program finished with exit code 0 Press ENTER to exit console.