Develop a program using pointers to compute the sum, mean and standard deviation of all elements stored in an array of N real numbers Program and Algorithm Computer Science Engineering VTU

pointers

#include <stdio.h>
#include <math.h>
void main()
{
	float a[10], *ptr, mean, sum=0, std,sumstd=0;
	int n,i;
	printf("Enter the number of elements : ");
	scanf("%d",&n);
	printf("Enter the array elements :\n");
	for( i=0; i<n; i++)
		scanf("%f",&a[i]);
	//assigning address of a to pointer ptr
	ptr = a;
	//compute the sum
	for(i=0;i<n;i++)
	{
		sum += *ptr;
		ptr++;
	}
	//compute the mean
	mean = sum/n;
	//compute standard deviation
	ptr = a;
	for(i=0; i<n; i++)
	{
		sumstd = sumstd + pow((*ptr-mean),2);
		ptr++;
	}
	std = sqrt(sumstd/n);
	//print sum, mean, & standard deviation
	printf("Sum = %f\n",sum);
	printf("Mean = %f\n",mean);
	printf("Standard Deviation : %f\n",std);
}   

POINTERS Algorithm 

Start

Read number of elements as n 

Read array elements 

For i = 0 to n

Read a[i]

Ptr = a

For i = 0 to n

sum = sum + *ptr

increment ptr by 1

mean = sum/n

ptr = a

For i = 0 to n

sumstd=sumstd + pow((*ptr - mean),2); 

increment ptr by 1 

std = sqrt(sumstd/n)

Display sum, mean, std

Stop