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  1. #include <stdio.h>
  2.  
  3. size_t down_rate(double *data,size_t len,unsigned rate_in,unsigned rate_out)
  4.   {
  5.    double sum=0;
  6.    size_t index=0,out=0,in=0;
  7.    while(in<len)
  8.      {
  9.       sum+=data[in++];
  10.       index+=rate_out; 
  11.       if(index>=rate_in)
  12.         {
  13.          data[out++]=sum*rate_out/index;
  14.          index-=rate_in;
  15.          sum=0;
  16.         }
  17.      }    
  18.    return out;
  19.   }
  20.  
  21. int main()
  22.   {
  23.    double data[]={1,2,3,4,5,6,7,8,9,10};
  24.    const size_t len=sizeof(data)/sizeof(*data);
  25.    size_t i,nlen;
  26.    for(i=0;i<len;++i) printf("%6.1lf",data[i]); printf("\n");
  27.    nlen=down_rate(data,len,2,1);
  28.    for(i=0;i<nlen;++i) printf("%6.1lf",data[i]); printf("\n");
  29.    return 0;
  30.   }
Success #stdin #stdout 0s 2156KB
comments (?)
stdin 
Standard input is empty
stdout 
   1.0   2.0   3.0   4.0   5.0   6.0   7.0   8.0   9.0  10.0
   1.5   3.5   5.5   7.5   9.5
https://ideone.com/uRPcRl
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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