高分求解两道C语言题(题目为英文)

Question

第一题:
Write a function named factor that factors its parameter, displaying the parameter and all its prime factors. For example, the function call factor (84) should display

84 = 2 × 2 × 2 × 3 × 7
（Hint: Use function find_div from Fig.6.13. Write a driver that tests your function with prime numbers and also with numbers having from two to eight prime factors ）

第二题:
Given the lengths a, b, c of the sides of a triangle, write a function to compute the area A of the triangle. The formula for computing A is given by
______________
A=√s (s-a) (s-b) (s-c)
Where s is the semiperimeter of the triangle
S= a + b + c / 2
题目提供了一个等腰三角形,上边角大概80度,下边两个角每个大概50度
Write a driver program to get values for a, b, and c and call your function to compute A. The driver should display A, a, b, and, c.

答的好我加高分，越完整分越高,拜托各位了.
能给程序加上注解吗?我刚开始学C,看不太懂.而且感觉格式有点儿凌乱.... 程序不全,放软件里都跑不起来..有几个错误.

Answer 1

第一题:
int factor(int number)
{
int counter;
if(number==1)
return 0;
else
{
for(counter=2;counter<=number;counter++)
{ if(number%counter==0)
{ cout<<counter;}
number=number%counter;
if(number!=1)
{cout<<"x";
factor(number);
}

}
}
第一题不是很efficient，不过用可以

第二题
float compute(int a, int b, int c)
{
float s;
s=(a+b+c)/2;
return sqrt(s*(s-float(a))*(s-float(b))*(s-float(c)));
//must include cmath.h
}