Assume a company's ROE is 14% and the required return on equity is 13%. All else remaining equal, if there is a decrease in a firm's retention rate, a stock's value as estimated by the constant growth dividend discount model (DDM) will most likely:（）

A. increase.

B. decrease.

C. not change.

有以下程序，若运时从键盘输入：18 ,11＜回车＞，则程序的输出结果是______。
main()
int a,b;
printf("Enter a,b:”);scanf("%d,%d",＆a, ＆b);
while(a!=b)
while(a＞b)a-=b;
while(b＞a)b-=a;

printf("%3d%3d\n" ,a,b);