fill memset, for小测试

/*很无聊写着玩玩，后来发现memset效率会比fill高出这么多，可惜一般只用来赋值0，-1.。。。。。以后可以用fill来偷偷懒了。。。*/

#include<iostream>

#include<ctime>

using namespace std;

#define max 100000000+5

int a[max];

int main()

{

time_t beg,end;

beg=clock();

cout<<"---------------------------for\n";

for(int i=0;i<max;i++)

{

a[i]=0;

}

end=clock();

cout<<"test 1 cost: "<<end-beg<<"MS"<<endl;

for(int i=0;i<max;i++)

{

a[i]=0;

}

end=clock();

cout<<"test 2 cost: "<<end-beg<<"MS"<<endl;

for(int i=0;i<max;i++)

{

a[i]=0;

}

end=clock();

cout<<"test 3 cost: "<<end-beg<<"MS"<<endl;

for(int i=0;i<max;i++)

{

a[i]=0;

}

end=clock();

cout<<"test 4 cost: "<<end-beg<<"MS"<<endl;

for(int i=0;i<max;i++)

{

a[i]=0;

}

end=clock();

cout<<"test 5 cost: "<<end-beg<<"MS"<<endl;

for(int i=0;i<max;i++)

{

a[i]=0;

}

end=clock();

cout<<"test 6 cost: "<<end-beg<<"MS"<<endl;

cout<<"---------------------------fill\n";

beg=clock();

fill(a,a+max,0);

end=clock();

cout<<"test 1 cost: "<<end-beg<<"MS"<<endl;

beg=clock();

fill(a,a+max,0);

end=clock();

cout<<"test 2 cost: "<<end-beg<<"MS"<<endl;

beg=clock();

fill(a,a+max,0);

end=clock();

cout<<"test 3 cost: "<<end-beg<<"MS"<<endl;

beg=clock();

fill(a,a+max,0);

end=clock();

cout<<"test 4 cost: "<<end-beg<<"MS"<<endl;

beg=clock();

fill(a,a+max,0);

end=clock();

cout<<"test 5 cost: "<<end-beg<<"MS"<<endl;

beg=clock();

fill(a,a+max,0);

end=clock();

cout<<"test 6 cost: "<<end-beg<<"MS"<<endl;

cout<<"---------------------------memset\n";

beg=clock();

memset(a,0,sizeof(a));

end=clock();

cout<<"test 1 cost: "<<end-beg<<"MS"<<endl;

beg=clock();

memset(a,0,sizeof(a));

end=clock();

cout<<"test 2 cost: "<<end-beg<<"MS"<<endl;

beg=clock();

memset(a,0,sizeof(a));

end=clock();

cout<<"test 3 cost: "<<end-beg<<"MS"<<endl;

beg=clock();

memset(a,0,sizeof(a));

end=clock();

cout<<"test 4 cost: "<<end-beg<<"MS"<<endl;

beg=clock();

memset(a,0,sizeof(a));

end=clock();

cout<<"test 5 cost: "<<end-beg<<"MS"<<endl;

beg=clock();

memset(a,0,sizeof(a));

end=clock();

cout<<"test 6 cost: "<<end-beg<<"MS"<<endl;

}