PAT (Basic Level) Practice （中文） 1026 程序运行时间

#include<stdio.h>
#include<math.h>
using namespace std;
int main(){
    int c1,c2,h,m,s;
    int c;
    scanf("%d %d",&c1,&c2);
    c = (c2-c1);
    h = c / (3600*100);
    m = c/ (60*100);
    m -= h * 60;
    s = round((c/100.0 - h * 3600 - m * 60)) ;
    printf("%02d:%02d:%02d\n",h,m,s);
    return 0;
}

#include<stdio.h>
#include<math.h>
using namespace std;
int main(){
    int c1,c2,h,m;
    double s;
    int c;
    scanf("%d %d",&c1,&c2);
    c = (c2-c1);
    h = c / (3600*100);
    m = c/ (60*100);
    m -= h * 60;
    s = (c/100.0 - h * 3600 - m * 60);
    printf("%02d:%02d:%02.0f\n",h,m,s);
    return 0;
}