C language: Any three side length, judge whether to form a triangle, if possible, to find its area and perimeter

Let the three side length, judge whether the triangle can be formed, if possible, to find its area and perimeter

Program:

#include <stdio.h>

#include <math.h>

int Main ()

{

Double A, B, C, D, S, area;

printf ("Please enter three positive numbers:");

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

if ( (A + B > C) && (A + C > B) && (b + C > a))

{

D = A + B + C;

s = 0.5*d;

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

printf ("d=%lf\tarea=%lf\t", D,area); //' \ t ' adjusts the output position to make the output data clear, neat and beautiful

}

Else

{

printf ("cannot form a triangle \ T");

}

return 0;

}

Results:

Please enter a three positive number: 4 5 6

d=15.000000 area=9.921567 Please press any key to continue ...

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C language: Any three side length, judge whether to form a triangle, if possible, to find its area and perimeter