4) Write a program that accept two time structures intervals and display the duration time between the two times also program test valid time interval using function.

   Write a program, which contents a structure to represent time in hours(0-23), minutes(0-59) and second (0-59). The program should accept two times from user and display the duration time between the two times.

source file name: timediff.C

#include<stdio.h>

struct time

{

int h,m,s;

};

int  main()

{

int validtime(struct time t);

struct time t1,t2;

int flag=0;

int hrs,min,sec;

//clrscr();

printf("\n enter first time interval H:M:S");

scanf("%d%d%d",&t1.h,&t1.m,&t1.s);

printf("\n enter second time interval H:M:S");

scanf("%d%d%d",&t2.h,&t2.m,&t2.s);

flag=validtime(t1);

flag=validtime(t2);

if(flag)

{

printf("\n Invalid time intervals ");

printf(" now program ends..");

goto p;

}

if(t2.s<t1.s)

{

sec=t2.s+60-t1.s;

t2.m=t2.m-1;

}

else

sec=t2.s-t1.s;

if(t2.m<t1.m)

{

min=t2.m+60-t1.m;

t2.h=t2.h-1;

}

else

min=t2.m-t1.m;

hrs=t2.h-t1.h;

printf("\n Time difference between given intervals: %d : %d : %d",hrs,min,sec);

p:

//getch();

return 0;

}

int  validtime(struct time t)

{

int f=0;

if(t.h>24 || t.h<0)

{

printf("\n invalid hours");

f=1;

}

if(t.m>60 || t.m<0)

{

printf("\n invalid minutes");

f=1;

}

if(t.s>60 || t.s<0)

{

printf("\n invalid seconds");

f=1;

}

return f;

}

output: