#include <stdio.h>
main()
{
        int Hours1,Hours2,Mins1,Mins2,ElapsedHours,ElapsedMins;

        printf("Hello, I am the time wizard!\n\n");
        printf("Please enter two separate times, and I'll tell you\n");
        printf("the amount of time elapsed between the two times.\n");
        printf("All times must be in the 24-hour clock format ");
        printf("-- e.g. 4:30 p.m.=1630\n\n");
        printf("Beginning with the greater time, enter the hours, then\n");
        printf("enter the minutes.\n\n");
        scanf("%d %d",&Hours1,&Mins1);
        printf("Now enter the hours, then enter the minutes, of the\n");
        printf("lesser time.\n\n");
        scanf("%d %d",&Hours2,&Mins2);
        if (Mins1 < Mins2)
                Hours1 = Hours1 - 1;
                Mins1 = Mins1 + 60;
        ElapsedHours = Hours1 - Hours2;
        ElapsedMins = Mins1 - Mins2;
        printf("The elapsed time is %d hours and %d minutes.\n",ElapsedHours,ElapsedMins);
}