C-language combat: Calculate the time difference

There are two ways to calculate the time difference, one is to convert the times to minutes, one to convert the time to hours, the latter to divide so it is unavoidable to generate floating-point numbers, so we choose to convert to minutes to calculate.

Title: Calculate their time difference at two points, for example, 1:50 and 3:21

Define four variables to save the input time
Default a time is less than B time
int ah=0;
int am=0;
int bh=0;
int bm=0;
int diff = 0;
int diffh=0;
int DIFFM = 0;
scanf_s ("%d%d", &ah,&am);
scanf_s ("%d%d", &BH,&BM);

Convert two time to minutes
AM = am + AH * 60;

BM = BM + BH * 60;

diff = Bm-am;
DIFFH = DIFF/60;
DIFFM = diff% 60;

printf ("The time difference is%dh:%dmin", DIFFH,DIFFM);

C-language combat: Calculate the time difference