Question

Create the Code using C Program:
2. Write a program to convert the time from 24-hour notation to 12-hour notation and vice-versa. Your program must be menu driven, giving the user the choice of converting the time between the two notations. Furthermore, your program must contain at least the following function: a function to convert the time from 24-hour notation to 12-hour notation, a function to convert the time from 12-hour notation to 24-hour notation, a function to display the choices, function(s) to get the input, and function(s) to display the results (For 12-hour time notation, your program must display AM or PM)

Answer 1

Code

#include<stdio.h>
#include<string.h>
int menu();
void take24HourInput(int *,int*,int*);
void convert24To12(int *,char []);
void print12HourFormat(int ,int ,int,char);
void take12HourInput(int *,int*,int*,char);
void convert12To24(int *,char []);
void print24HourFormat(int ,int ,int);
int main()
{
   int choice;
   int hh, mm, ss;
char a[3];
   do
   {
       choice=menu();
       if(choice==1)
       {
           take24HourInput(&hh,&mm,&ss);
           convert24To12(&hh,a);
           print12HourFormat(hh,mm,ss,a);
       }
       else if(choice==2)
       {
           take12HourInput(&hh,&mm,&ss,a);
           convert12To24(&hh,a);
           print24HourFormat(hh,mm,ss);
       }
   }while(choice!=0);
}
int menu()
{
   int choice;
   printf("1) Convert the time from 24-hour notation to 12-hour notation\n");
   printf("2) Convert the time from 12-hour notation to 24-hour notation\n");
   printf("0) Exit\n");
   printf("Enter your choice: ");
   scanf("%d",&choice);

}
void take24HourInput(int *hh,int *mm,int *ss)
{
   int h,m,s;
   printf("Enter hours 'hh' \t");
scanf("%d", &h);
printf("Enter minutes 'mm' \t");
scanf("%d", &m);
printf("Enter seconds 'ss' \t");
scanf("%d", &s);
   *hh=h;
   *mm=m;
   *ss=s;
}
void take12HourInput(int *hh,int *mm,int *ss,char a[])
{
   int h,m,s;
   printf("Enter hours 'hh' \t");
scanf("%d", &h);
printf("Enter minutes 'mm' \t");
scanf("%d", &m);
printf("Enter seconds 'ss' \t");
scanf("%d", &s);
printf("Enter string 'am' or 'pm' \t");
scanf("%s", &a);
   *hh=h;
   *mm=m;
   *ss=s;
}
void convert24To12(int *h,char a[])
{
   if(*h==0 || *h==24)
   {
       *h=12;
   }
   else if(*h>12)
   {
       *h-=12;
       strcpy(a,"PM");
   }
   else
   {
       strcpy(a,"AM");
   }
}
void convert12To24(int *h,char a[])
{
       if((strcmp(a,"PM") == 0) || (strcmp(a,"pm") == 0) && (h != 0) && (*h != 12))
{
*h = *h + 12;
}
if((strcmp(a,"AM") == 0) || (strcmp(a,"am") == 0) && (*h == 12))
{
*h = 0;
}
}
void print12HourFormat(int hh,int mm,int ss,char a[])
{
   printf("\n12 Hour Format: ");
   printf("\n%02d:%02d:%02d %s\n\n",hh,mm,ss,a);
}
void print24HourFormat(int hh,int mm,int ss)
{
   printf("\n24 Hour Format: ");
   printf("\n%02d:%02d:%02d %s\n\n",hh,mm,ss);
}

output

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