task2.c

include<stdio.h>

int main()
{
double a, b, c;

scanf_s("%f%1f%1f", &a, &b, &c);

if (a + b < c && a + c < b && b + c < a)
    printf("能构成三角形\n");
else
    printf("不能构成三角形\n");

return 0;
}