Time arithmatic

Time arithmatic

#include<stdio.h>
#include<conio.h>

typedef struct
{
int hh,mm,ss;
}time;

time add(time f,time s);
time sub(time f,time s);
time input(void);

void main()
{
time f,s,ans;
int ch;
clrscr();
do
{
printf("\n <1> enter first operand ");
printf("\n <2> enter second operand ");
printf("\n <3> time addition ");
printf("\n <4> time subtraction ");
printf("\n <5> Exit \n\n");
do
{
printf("enter your choice ");
scanf("%d",&ch);
}while(ch<1 || ch>5);
switch (ch)
{
case 1:
printf("\n enter the time(hh mm ss) ");
f=input();
break;
case 2:
printf("\n enter the time(hh mm ss) ");
s=input();
break;
case 3:
ans=add(f,s);
printf("\n time addition is %d %d %d",ans.hh,ans.mm,ans.ss);
break;
case 4:
ans=sub(f,s);
printf("\n time subtraction is %d %d %d",ans.hh,ans.mm,ans.ss);
break;
}
}while(ch!=5);
}

time input(void)
{
time temp;
do
{
printf("\n enter the hours : ");
scanf("%d",&temp.hh);
}
while(temp.hh<0 || temp.hh>12);
do
{
printf("\n enter the minutes : ");
scanf("%d",&temp.mm);
}
while(temp.mm<0 || temp.mm>=60);
do
{
printf("\n enter the seconds : ");
scanf("%d",&temp.ss);
}
while(temp.ss<0 || temp.ss>=60);
return temp;
}
time add(time x,time y)
{
time a;
if(x.ss+y.ss>60)
++x.mm,a.ss=(x.ss+y.ss)%60;
else
a.ss=x.ss+y.ss;
if(x.mm+y.mm>60)
++x.hh,a.mm=(x.mm+y.mm)%60;
else
a.mm=x.mm+y.mm;
if(x.hh+y.hh>12)
a.hh=(x.hh+y.hh)%12;
else
a.hh=x.hh+y.hh;
if(a.hh==0)
a.hh=12;
return a;
}

time sub(time x,time y)
{
time a;
if(x.ss-y.ss<0)
--x.mm,a.ss=60+x.ss-y.ss;
else
a.ss=x.ss-y.ss;
if(x.mm-y.mm<0)
--x.hh,a.mm=60+x.mm-y.mm;
else
a.mm=x.mm-y.mm;
if(x.hh-y.hh<0)
a.hh=12+x.hh-y.hh;
else
a.hh=x.hh-y.hh;
if(a.hh==0)
a.hh=12;
return a;
}

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