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52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/*
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* C program to evaluate a given polynomial by reading its coefficients
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* in an array.
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* P(x) = AnXn + An-1Xn-1 + An-2Xn-2+... +A1X + A0
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*
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* The polynomial can be written as:
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* P(x) = A0 + X(A1 + X(A2 + X(A3 + X(Q4 + X(...X(An-1 + XAn))))
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* and evaluated starting from the inner loop
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#define MAXSIZE 10
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void main()
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{
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int array[MAXSIZE];
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int i, num, power;
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float x, polySum;
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printf("Enter the order of the polynomial \n");
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scanf("%d", &num);
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printf("Enter the value of x \n");
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scanf("%f", &x);
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/* Read the coefficients into an array */
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printf("Enter %d coefficients \n", num + 1);
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for (i = 0; i <= num; i++)
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{
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scanf("%d", &array[i]);
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}
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polySum = array[0];
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for (i = 1; i <= num; i++)
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{
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polySum = polySum * x + array[i];
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}
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power = num;
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printf("Given polynomial is: \n");
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for (i = 0; i <= num; i++)
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{
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if (power < 0)
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{
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break;
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}
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/* printing proper polynomial function */
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if (array[i] > 0)
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printf(" + ");
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else if (array[i] < 0)
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printf(" - ");
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else
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printf(" ");
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printf("%dx^%d ", abs(array[i]), power--);
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}
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printf("\n Sum of the polynomial = %6.2f \n", polySum);
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} |