C++ While和For耗时对比，注意使用场景

1.单纯作为循环使用，处理时间差不多

 long long time = 9999999999;
 long long key = 49889;
 vector<long long >Data1, Data2;
 clock_t start, end;
 start = clock();
 for (long long i = 0; i < time; i++)
 {
     if (i / key == 4 )
     {
         Data1.push_back(i);
     }
 }
 end = clock();
 double t1 = end - start;
 cout << t1 << endl;

 start = clock();
 long long itime = 0;
 while (itime < time )
 {
     itime++;
     if (itime / key == 4)
     {
         Data2.push_back(itime);
     }
 }
  
 end = clock();
 double t2 = end - start;
 cout << t2 << endl;

2.在While中添加循环条件时，While处理时间比For快很多，但注意只能输出一个数据

 long long time = 9999999999;
 long long key = 49889;
 vector<long long >Data1, Data2;
 clock_t start, end;
 start = clock();
 for (long long i = 0; i < time; i++)
 {
     if ( i/key==4&& i%key==1)
     {
         Data1.push_back(i);
     }
 }
 end = clock();
 double t1= end - start;
 cout << t1 <<  endl;

 start = clock();
 long long itime = 0;
 while (itime<time &&  ( itime / key != 4 || itime%key!=1))
 {
     itime++;
 }
 Data2.push_back(itime);
 end = clock();
 double t2 = end - start;
 cout << t2 << endl;