C Programming (Turbo C++ Compiler) - Calculate Variance
I have given the simple C program for calculating sample and population variance for a set of numbers. The other related linkes are,
Calculate Mean
Calculate Median
Calculate Mode
Calculate Range
Calculate Variance
Calculate Standard Deviation
Source Code
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
float CalculateMean(float *value, int max)
{
int i;
float sum = 0;
for( i = 0; i < max; i++)
sum = sum + value[i];
return (sum / max);
}
float CalculateVariane(float *value, int max)
{
float mean = CalculateMean(value, max);
int i = 0;
float temp = 0;
for(i = 0; i < max; i++)
temp += (value[i] - mean) * (value[i] - mean) ;
return temp / max;
}
float CalculateSampleVariane(float *value, int max)
{
float mean = CalculateMean(value, max);
float temp = 0;
int i = 0;
for(i = 0; i < max; i++)
temp += (value[i] - mean) * (value[i] - mean) ;
return temp / (max - 1);
}
int main()
{
float arrNumbers[100];
int i, max;
float mean;
char buf[1024];
float variance, samplevariance;
printf("Total Number of Elements: ");
scanf("%d", &max);
for(i = 0; i < max; i++)
{
printf("Enter [%d] Number: ", i + 1);
scanf("%f", &arrNumbers[i]);
}
printf("\nTotal Numbers: %d", max);
mean = CalculateMean(arrNumbers, max);
variance = CalculateVariane(arrNumbers, max);
samplevariance = CalculateSampleVariane(arrNumbers, max);
printf("\nMean: %f", mean);
printf("\nSample Variance: %f", samplevariance);
printf("\nPopulation Variance: %f", variance);
return 0;
}
Output
Total Number of Elements: 10
Enter [1] Number: 6
Enter [2] Number: 7
Enter [3] Number: 8
Enter [4] Number: 7
Enter [5] Number: 6
Enter [6] Number: 5
Enter [7] Number: 2
Enter [8] Number: 2
Enter [9] Number: 9
Enter [10] Number: 3
Total Numbers: 10
Mean: 5.500000
Sample Variance: 6.055555
Population Variance: 5.450000
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