我想显示程序启动后经过的秒数:
volatile time_t start_time = time(NULL);
volatile time_t target_seconds = 60*60*17;
volatile time_t time_passed = 0;
while(1)
{
time_passed = time(NULL)-start_time;
printf("\rTime elapsed=%lu/%lu(seconds)", time_passed, target_seconds);
}
输出:
Time elapsed=1/61200(second)
但无论time\u传递的值是多少，它都会不断更新显示.
现在，我只想更新实际时间增加时经过的显示时间.
volatile time_t start_time = time(NULL);
volatile time_t target_seconds = 60*60*17;
volatile time_t time_passed = 0;
while(1){
if ((time(NULL)-start_time) != time_passed)
{
time_passed = time(NULL)-start_time;
printf("\rTime elapsed=%lu/%lu(seconds)", time_passed, target_seconds);
}
}
现在它什么也不显示.