﻿ Example of C program/code to evaluate the given polynomial P(x)=AnXn + An-1Xn-1 + An-2Xn-2+... +A1X + A0
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# Evaluate the given polynomial P(x)=AnXn + An-1Xn-1 + An-2Xn-2+... +A1X + A0

```/* Write a C program to evaluate the given polynomial    *
* P(x)=AnXn + An-1Xn-1 + An-2Xn-2+... +A1X + A0, by     *
* reading its coefficents into an array. [Hint:Rewrite  *
* the polynomial as					 *
* P(x) = a0 + x(a1+x(a2+x(a3+x(a4+x(...x(an-1+xan))))   *
* and evalate the function starting from the inner loop]*/```

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#define MAXSIZE 10

voidmain()
{
int a[MAXSIZE];
int i, N,power;
float x, polySum;

clrscr();

printf("Enter the order of the polynomial\n");
scanf("%d", &N);

printf("Enter the value of x\n");
scanf("%f", &x);

/*Read the coefficients into an array*/

printf("Enter %d coefficients\n",N+1);
for (i=0;i <= N;i++)
{
scanf("%d",&a[i]);
}

polySum = a;

for (i=1;i<= N;i++)
{
polySum = polySum * x + a[i];
}

power = N;

/*power--;*/

printf("Given polynomial is:\n");
for (i=0;i<= N;i++)
{
if (power < 0)
{
break;
}

/* printing proper polynomial function*/
if (a[i] > 0)
printf(" + ");
else if (a[i] < 0)
printf(" - ");
else
printf (" ");
printf("%dx^%d ",abs(a[i]),power--);

}

printf("\nSum of the polynomial = %6.2f\n",polySum);
}

/*-----------------------------------------------------
Output
RUN 1
Enter the order of the polynomial
2
Enter the value of x
2
Enter 3 coefficients
3
2
6
Given polynomial is:
+ 3x^2 + 2x^1 + 6x^0
Sum of the polynomial = 22.00

RUN 2
Enter the order of the polynomial
4
Enter the value of x
1
Enter 5 coefficients
3
-5
6
8
-9
Given polynomial is:
+ 3x^4 - 5x^3 + 6x^2 + 8x^1 - 9x^0
Sum of the polynomial = 3.00

-----------------------------------------------------*/