c语言统计程序执行时间

c语言程序执行时间

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#include <iostream> #include <cstdio> #include <ctime>   int main() {     std::clock_t start;     double duration;       start = std::clock();     int i, sum;     for(i=1; i<100000000; i++){       sum+=i;     }     /* Your algorithm here */       duration = ( std::clock() - start ) / (double) CLOCKS_PER_SEC;       std::cout<<"printf: "<< duration <<'\n'; }