你好。clock函数返回进程运行时间，但是这个运行时间单位不是秒，而是CPU运行的时钟周期计数。所以要得到消耗的时间（秒），需要除以CPU时钟频率，也就是CLOCKS_PER_SEC.以得到一个以秒为单位的数值。printf("%.2lf\n",(double)clock()/CLOCKS_PER_SEC);因此这行就是输出程序运行时间。
clock_t start, finish; double duration; start = clock(); //type your tested code here finish = clock(); duration = (double)(finish – start) / CLOCKS_PER_SEC; printf(“%f seconds\n”, duration); system(“pause”);//经典的程序暂停法 二)基于Counter的测量方法 缺点:只能用汇编语言读取,...
#define CLOCKS_PER_SEC ((clock_t)1000) 可以看到每过千分之一秒(1毫秒),调用clock()函数返回的值就加1。下面举个例子,你可以使用公式clock()/CLOCKS_PER_SEC来计算一个进程自身的运行时间: void elapsed_time() { printf("Elapsed time:%u secs.\n",clock()/CLOCKS_PER_SEC); } 当然,你也可以用clo...
(i=0;i<4000000000;i++) { if (da==db) //MAKE CHANGES HERE { cc = 2.0+i; da == cc; } else { cc = 2.0+i; db = cc; } } end = std::clock(); diff = ( end - start) / (double) CLOCKS_PER_SEC; printf ("Done[%f]: %f\n",cc,diff); //getline(cin,input); return...
PRIVATE(this)->autoredrawenabled =true;// process the delay queue the next time we enter this function,// unless we get here after a call to redraw().PRIVATE(this)->processdelayqueue =true;std::clock_tend =std::clock(); renderTime =double(double(end-begin)/CLOCKS_PER_SEC)*1000.0; ...
double duration;start = clock();for ( int i = 0 ; i < 1000000 ; i++ )pS->f(t);finish = clock();duration = (double)(finish - start) / (CLOCKS_PER_SEC);printf( "%2.1f seconds\n", duration );printf("after calling struct S\n");}...
{ S* pS = &s; T t; clock_t start, finish; double duration; start = clock(); for ( int i = 0 ; i < 1000000 ; i++ ) pS->f(t); finish = clock(); duration = (double)(finish - start) / (CLOCKS_PER_SEC); printf( "%2.1f seconds\n", duration ); printf("after ...
//log_debug("\n\ntext_draw_all(is_video=%d) took %d ms, has_changed=%d\n", is_video, (clock() - start_time) * 1000 / CLOCKS_PER_SEC, has_anything_changed); return has_anything_changed; }0 comments on commit d1ee7d8 Please sign in to comment. ©...
x16 83 105 94 115 102 125 104 125 115 135 mA IDD2P PrechargePower-DownStandbyCurrent:all banksidle;power-downmode; CKE<=VILMAX 57686869 6 9 mA 1,2 PrechargeFloatingStandbyCurrent: /CS>=VIHMIN,all banksidle; IDD2F CKE>=VIHMIN;addressandothercontrol inputschangingonceperclockcycle...
cout<<"< Elapsed Time: "<<(clock()-t)/CLOCKS_PER_SEC<<" s>"<<endl; } int main() { int k=0; cout<<"http://blog.csdn.net/NUPTboyZHB\n"; while (true) { cout<<"查看前K个频率最高的汉字,K="; cin>>k; ...