compute-mean.c

对IEEE 802.11e里的分布式信道接入算法EDCA进行改进

/*******Lamia**********/
/* This program is used to compute the mean of n values that are saved in a file per
line. The command line to be used is : compute-mean file-name n
*/

#include <stdio.h>
#include <stdlib.h>



/* Compute the maximum between the number in  
 * the second column                 
 * 
 * Input:
 *   src1, src2 - two columns files
 *
 *   res - two column file
 */

int main(int argc, char **argv) {

  FILE *df1 ;
  
	int nflows;
	
  float sum;
  
	float mean;
	
	
	sum = 0.0;
	mean =0.0;

  if (argc != 3) {
    //printf("Ussage: %s srcfile nflows \n", argv[0]);
    exit(-1);
  }
 
 if (!(df1 = fopen (argv[1], "r"))) {
    printf ("fopen() failed\n");
    exit (1);
  }
  
	nflows=atoi(argv[2]);
	
	while (!feof(df1)) {
		
		fscanf(df1, "%f\n", &mean);
		
		sum = sum + mean ;
		
  } 
  
	printf("%f", sum/nflows);
	
  fclose(df1);

}