Answer / Vicky Kumar Gupta

Here's a simple C program that classifies a triangle based on its side lengths. This program assumes that the input sides are sorted in ascending order (a <= b <= c).n```cn#include <stdio.h>nnvoid checkTriangle(int a, int b, int c)n{n if (a + b > c && b + c > a && a + c > b) {n printf("The input is a valid triangle.");n if (a == b && b == c) {n printf(" The triangle is equilateral. n" );n } else if (a == b || b == c || a == c) {n printf(" The triangle is isosceles. n" );n } else {n printf(" The triangle is scalene. n" );n }n }n else {n printf("The input is not a valid triangle.");n }n}nnint main() {n int side1, side2, side3;nnprintf("Enter three sides of a triangle: ");nscanf("%d %d %d", &side1, &side2, &side3);ncheckTriangle(side1, side2, side3);nreturn 0;n}n```

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