C 语言实例 – 计算标准偏差

#include <stdio.h>
#include <math.h>
 
float calculateSD(float data[]);
 
int main()
{
    int i;
    float data[10];
 
    printf("输入10个元素: ");
    for(i=0; i < 10; ++i)
        scanf("%f", &data[i]);
 
    printf("\n标准偏差 = %.6f", calculateSD(data));
 
    return 0;
}
 
float calculateSD(float data[])
{
    float sum = 0.0, mean, standardDeviation = 0.0;
 
    int i;
 
    for(i=0; i<10; ++i)
    {
        sum += data[i];
    }
 
    mean = sum/10;
 
    for(i=0; i<10; ++i)
        standardDeviation += pow(data[i] - mean, 2);
 
    return sqrt(standardDeviation/10);
}