luc026.c

Metadata

• Author — Amit Dutta (amitdutta4255@gmail.com)
• Last updated — 12 Dec 2025
• License — MIT

Problem Statement

Problem Statement

Write a program to recieve value of an angle in degreesand check whether sum of squares of sine and cosine of this angle is equal to 1.

Source Code

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#include <stdio.h>
#include <math.h>
#define EPSILON 0.0000001

int main()
{
    double angle, result;
    printf("Enter the angle value in degree : ");
    // checking if the input is other than number.
    if(scanf("%lf", &angle) != 1) {
        printf("\nPlease enter a number.");
        return 1;
    }
    angle = angle * (M_PI / 180); // converting degree to radian
    result = pow(sin(angle), 2) + pow(cos(angle), 2);
    (fabs(result - 1.0) < EPSILON) ?
    printf("\nsum of squares of sine and cosine of this angle is equal to 1.") :
    printf("\nsum of squares of sine and cosine of this angle is NOT equal to 1.");
    return 0;
}