关于cout函数和printf函数的效率问题

  写了个小程序测试了一下cout函数和printf函数的效率，看来printf函数的确效率要高不少。

 1 #include <iostream>
 2 #include <time.h> 
 3 using namespace std;
 4 
 5 int main()
 6 {
 7     long sTime, eTime, timeForCout, timeForPrintf;
 8     int a[30000];
 9 
10     int i;
11     for (i = 0; i < 30000; i++) {
12         a[i] = i;
13     }
14 
15     sTime = clock();
16     for (i = 0; i < 30000; i++) {
17         cout << a[i] << "\n";
18     }
19     eTime = clock();
20     timeForCout = eTime - sTime;
21 
22     sTime = clock();
23     for (i = 0; i < 30000; i++) {
24         printf("%d\n", a[i]);
25     }
26     eTime = clock();
27     timeForPrintf = eTime - sTime;
28 
29     cout << "cout时间：" << timeForCout << "ms" << endl;
30     cout << "printf时间：" << timeForPrintf << "ms" << endl;
31 
32     system("pause");
33     return 0;
34 }

转载于:https://www.cnblogs.com/IT-nerd/p/3453260.html