35 lines
992 B
C
35 lines
992 B
C
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/*
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* C program to find the value of cos(x) using the series
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* up to the given accuracy (without using user defined function)
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* also print cos(x) using library function.
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*/
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#include <stdio.h>
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#include <math.h>
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#include <stdlib.h>
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void main()
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{
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int n, x1;
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float accuracy, term, denominator, x, cosx, cosval;
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printf("Enter the value of x (in degrees) \n");
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scanf("%f", &x);
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x1 = x;
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/* Converting degrees to radians */
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x = x * (3.142 / 180.0);
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cosval = cos(x);
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printf("Enter the accuracy for the result \n");
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scanf("%f", &accuracy);
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term = 1;
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cosx = term;
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n = 1;
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do
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{
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denominator = 2 * n * (2 * n - 1);
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term = -term * x * x / denominator;
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cosx = cosx + term;
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n = n + 1;
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}
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while (accuracy <= fabs(cosval - cosx));
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printf("Sum of the cosine series = %f\n", cosx);
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printf("Using Library function cos(%d) = %f\n", x1, cos(x));
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}
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