基本操作，时间（60进制）加减

自习注意

没专业参考答案的前提下

自己很难摸清思路的难点痛点

以及自己的思路是否简便

核心痛点，模运算不会使用

#include <stdio.h>
typedef struct
{
	int hours;
	int minutes;
}time;
time add_time(time t1,time t2)
{
	time result;
	result.minutes=t1.minutes+t2.minutes;
	result.hours=t1.hours+t2.hours;
	if(result.minutes>=60)
	{
		result.minutes %=60;
		result.hours+=1 ;
	}
	return result;
}
time subtract_time(time t1,time t2)
{
	time result;
	result.hours=t1.hours-t2.hours;
	result.minutes=t1.minutes-t2.minutes;
	if(result.minutes<0)
	{
		result.hours--;
		result.minutes = result.minutes+60;
	}
	return result;
}
int main() 
{
	time t1={2,30};
	time t2={1,45};
	time sum = add_time(t1, t2);
    time difference = subtract_time(t1, t2);
    printf("Sum: %02d hours %02d minutes\n", sum.hours, sum.minutes);
    printf("Difference: %02d hours %02d minutes", difference.hours, difference.minutes);
    return 0;
}