C Programming Code Examples
C > If Else and Switch Case Code Examples
check whether triangle is equilateral, scalene or isosceles
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/* check whether triangle is equilateral, scalene or isosceles
Write a C program to input sides of a triangle and check whether a triangle is equilateral, scalene or isosceles triangle using if else. How to check whether a triangle is equilateral, scalene or isosceles triangle in C programming.
Properties of triangle
A triangle is said Equilateral Triangle, if all its sides are equal. If a, b, c are three sides of triangle. Then, the triangle is equilateral only if a == b == c.
A triangle is said Isosceles Triangle, if its two sides are equal. If a, b, c are three sides of triangle. Then, the triangle is isosceles if either a == b or a == c or b == c.
A triangle is said Scalene Triangle, if none of its sides are equal.
Logic to check equilateral, scalene or isosceles triangle
Input sides of a triangle from user. Store it in some variables say j1, j2 and j3.
Check if(j1 == j2 && j2 == j3), then the triangle is equilateral.
If it is not an equilateral triangle then it may be isosceles. Check if(j1 == j2 || j1 == j3 || j2 == j3), then triangle is isosceles.
If it is neither equilateral nor isosceles then it scalene triangle. */
#include <stdio.h>
int main()
{
int j1, j2, j3;
/* Input sides of a triangle */
printf("Enter three sides of triangle: ");
scanf("%d%d%d", &j1, &j2, &j3);
if(j1==j2 && j2==j3)
{
/* If all sides are equal */
printf("Equilateral triangle.");
}
else if(j1==j2 || j1==j3 || j2==j3)
{
/* If any two sides are equal */
printf("Isosceles triangle.");
}
else
{
/* If none sides are equal */
printf("Scalene triangle.");
}
return 0;
}
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