题解 | #三角形判断#

#include<stdio.h>

int main()

{

int a, b, c;

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

if (a < b)

{

a = a + b;

b = a - b;

a = a - b;

}

// printf("%d %d", a, b);

if (a < c)

{

a = a + c;

c = a - c;

a = a - c;

}

if (b < c)

{

b = b + c;

c = b - c;

b = b - c;

}

if (b + c > a)

{

if (b == c && b == a)

printf("Equilateral triangle!");

else if ((b == c && b != a) || (a == b && b != c))

printf("Isosceles triangle!");

else

printf("Ordinary triangle!");

}

if (b + c <= a)

{

printf("Not a triangle!");

}

return 0;

}