Program 8 Check Triangle or Not

#include<stdio.h>
#include<conio.h>

void main()
{

float a,b,c,A,d;
clrscr();
printf("enter value of first angel A:");
scanf("%f",&a);
printf("enter value of second angel B:");
scanf("%f",&b);

printf("enter value of threed angel C:");
scanf("%f",&c);

d=a+b+c;

if(d==180)
{

printf("this is a triangel");

}

else
{

printf("this is not triangel");

}

getch();

}