int main(int argc, char * argv[])
{
int * arr;
int iter;
int length = 12;
arr = malloc(length * sizeof(int));
if (arr == NULL)
{
printf("malloc fails.\n");
return EXIT_FAILURE;
}
for (iter = 0; iter < length; iter ++)
{
arr[iter] = iter;
}
printf("Original array: ");
for (iter = 0; iter < length; iter ++)
{
printf("%2d ", arr[iter]);
}
printf("\n");
multi2(arr, length);
printf("New array: ");
for (iter = 0; iter < length; iter ++)
{
printf("%2d ", arr[iter]);
}
printf("\n");
free (arr);
return EXIT_SUCCESS;
}
int main()
{
int x,y,z,r;
printf("Ingrese numero A ");
scanf("%d",&x);
printf("Ingrese numero B ");
scanf("%d",&y);
multi1(x,y,&z);
printf("La multiplicacion de %d con %d es %d\n",x,y,z);
z = multi2(x,y);
printf("La multiplicacion de %d con %d es %d\n",x,y,z);
system("pause");
}
int main()
{
int start, end;
field28 a=0x57, b=0x00;
field28 randarr[100000];
int i;
srand(time(NULL));
for(i=0; i<100000; i++)
randarr[i] = (field28)rand();
//multi2 函数计算
start = clock();
for(i=0; i<100000; i++){
a = randarr[i];
b = multi2(a,inverse(a));
}
printf("0x%hhx * 0x%hhx = 0x%hhx\n", a, inverse(a), b);
end = clock();
printf("multi2 计算次数:%d, 用时:%fs\n",i, (double)(end-start)/CLOCKS_PER_SEC);
//multi 函数查表
start = clock();
for(i=0; i<100000; i++){
a = randarr[i];
b = multi(a,inverse(a));
}
printf("0x%hhx * 0x%hhx = 0x%hhx\n", a, inverse(a), b);
end = clock();
printf("multi 计算次数:%d, 用时:%fs\n",i, (double)(end-start)/CLOCKS_PER_SEC);
//mult 不调用函数，直接查表
start = clock();
for(i=0; i<100000; i++){
a = randarr[i];
b = mult[a][inve[a]];
}
printf("0x%hhx * 0x%hhx = 0x%hhx\n", a, inverse(a), b);
end = clock();
printf("mult[256][256] 计算次数:%d, 用时:%fs\n",i, (double)(end-start)/CLOCKS_PER_SEC);
return 0;
}
