#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
int main()
{
int a,b,i;
i=24;
a=60;
b=60;
while(1){
while(i>=11){
while(a>=11){
while(b>=11){
system("cls");
printf("%d:%d:%d",i-1,a-1,b-1);
Sleep(1000);
b=b-1;}
while(b>=1){
system("cls");
printf("%d:%d:0%d",i-1,a-1,b-1);
Sleep(1000);
b=b-1;}
a=a-1;
b=60;}
while(a>=1){
while(b>=11){
system("cls");
printf("%d:0&d:%d",i-1,a-1,b-1);
Sleep(1000);
b=b-1;}
while(b>=1){
system("cls");
printf("%d:0%d:0%d",i-1,a-1,b-1);
Sleep(1000);
b=b-1;}
a=a-1;
b=60;}
i=i-1;
a=60;}
while(i>=1){
while(a>=11){
while(b>=11){
system("cls");
printf("0%d:%d:%d",i-1,a-1,b-1);
Sleep(1000);
b=b-1;}
while(b>=1){
system("cls");
printf("0%d:%d:0%d",i-1,a-1,b-1);
Sleep(1000);
b=b-1;}
a=a-1;
b=60;}
while(a>=1){
while(b>=11){
system("cls");
printf("0%d:0%d:%d",i-1,a-1,b-1);
Sleep(1000);
b=b-1;}
while(b>=1){
system("cls");
printf("0%d:0%d:0%d",i-1,a-1,b-1);
Sleep(1000);
b=b-1;}
a=a-1;
b=60;}
i=i-1;
a=60;}
i=24;
a=60;
b=60;}
system("pause");
return 0;
}
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