在本文中,我们将讨论difftime()
C ++中的函数,其语法,工作原理和返回值。
difftime()函数是C ++中的内置函数,在头文件中定义。函数接受time_t类型的两个参数,函数计算两次之间的差
double difftime(time_t end, time_t beginning);
返回以double数据类型存储的时间差(以秒为单位)。
#include <stdio.h> #include <time.h> int main () { time_t now; struct tm newyear; double seconds; time(&now); /* get current time; */ newyear = *localtime(&now); newyear.tm_hour = 0; newyear.tm_min = 0; newyear.tm_sec = 0; newyear.tm_mon = 0; newyear.tm_mday = 1; seconds = difftime(now,mktime(&newyear)); printf ("%.f seconds since new year in the current timezone.\n", seconds); return 0; }
输出结果
如果我们运行上面的代码,它将生成以下输出-
3351041 seconds since new year in the current timezone.
#include <iostream> #include <ctime> using namespace std; int main() { time_t start, ending; long addition; time(&start); for (int i = 0; i < 50000; i++) { for (int j = 0; j < 50000; j++); } for (int i = 0; i < 50000; i++) { for (int j = 0; j < 50000; j++); } for (int i = 0; i < 50000; i++) { for (int j = 0; j < 50000; j++); } time(&ending); cout << "Total time required = " << difftime(ending, start) << " seconds " << endl; return 0; }
输出结果
如果我们运行上面的代码,它将生成以下输出-
Total time required = 37 seconds