mult.cpp
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	#include <iostream>
	#include <string>
	#include <random>
	#include <string>
	#include <chrono>
	#include <cstdlib>
	#include <chrono>
	using namespace std;

	int main(){

	int rows=1000;
	int cols=rows;


	double matrix[rows*cols];
	double vector[rows];


	for(int i=0;i<rows;i++){
	for(int j=0;j<cols;j++){
	matrix[j+colsi]=j+colsi;
	}
	vector[i]=i;
	}

	clock_t begin = clock();

	for(int a=0;a<1000;a++){
	double result[rows];
	for(int i=0;i<rows;i++){
	double sum=0;
	for(int j=0;j<cols;j++){
	sum+=matrix[icols+j]vector[j];
	}
	result[i]=sum;
	}
	}

	clock_t end = clock();

	double elapsed_secs = double(end - begin) / CLOCKS_PER_SEC;

	printf("wall clock time (clock_t) = %.4gs\n", elapsed_secs);

	return 0;
	}