Passing of arrays to a function C Program

//Code for Passing of arrays to a function in C Programming

#include     <math.h>                                      
   #define SIZE    5                         
   float std_dev(float a[], int n);
   float mean (float a[], int n);
   main( )                                                    
   {
        floatvalue[SIZE];
        int i;                                                
                                                              
        printf("Enter %d float values\n", SIZE);              
        for (i=0 ;i < SIZE ; i++)                             
            scanf("%f", &value[i]);                           
        printf("Std.deviation is %f\n", std_dev(value,SIZE)); 
   }                                                          
   float std_dev(float a[], int n)                                         
   {    int i;                                                
        float x, sum = 0.0;                           
        x = mean (a,n);                                       
        for(i=0; i < n; i++)                                   
            sum += (x-a[i])*(x-a[i]);                             
        return(sqrt(sum/(float)n));                           
   }                                                          
   float mean(float a[],int n)                                            
   {                                                          
        int i ;                                               
        float sum = 0.0;                                      
        for(i=0 ; i < n ; i++)                                
           sum = sum + a[i];                                  
        return(sum/(float)n);                                 
   }
                                                         
Output:
Enter 5 float values                                       
35.0 67.0 79.5 14.20 55.75  
                              
Std.deviation is 23.231582