2011-01-04 回答

#include

#include

#include

#include

#include

int main()

{

float a = 0.0;

float b = 0.0;

float c = 0.0;

float s = 0.0;

double area = 0.0;

while(true)

{

printf("input your date(a,b,c):");

scanf("%f%f%f",&a,&b,&c);

if(!isdigit((int)a) || !isdigit((int)b) || !isdigit(int(c))??|| a + b <= c || a + c <= b || b + c <= a)

{

printf("your date is error!\n");

printf("Enter any key to continue...\n");

getch();

system("cls");

continue;

}

else

{

s = (a + b + c)/3;

area = sqrt(s * (s - a) * (s - b) * (s - c));

printf("the area is %-5.2f",area);

break;

}

}

return 0;

}

追問：

大哥，我不懂電腦，我是幫朋友問的，這是C語言代碼嗎，必須是C語言的代碼哦。

追答：

當然是的? 你可以在vc6上編譯試試