how to work out the sum of a coloumn, in C

Discussion in 'C' started by nzrusty, Dec 12, 2006.

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  1. nzrusty

    nzrusty New Member

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    Im trying to work out the total values of a table, which i have read from a file

    x y
    1.0 2.876
    2.6 4.234
    3.7 8.874
    4.5 7.698
    6.0 9.932

    I want to work out the total values of x, i.e sum of.

    How would i implement this, please. thanks, here is what i have so far, im new to programming so the sum of section at the end maybe a bit wrong, can u please help.
    Code:
    #include <stdio.h>
    #include <math.h>
    
    int main(void)
    
    {
    	char line [101];
    	char *line_ptr;
    	double x, y;
    	int no_values=-1;
    	double sum_x;
    	int i=0;
    	
    	FILE *input_stream;
    	
    	if ((input_stream=fopen("test_data.dat", "r")) != NULL)
    		
    	{
    		while ((line_ptr=fgets(line, sizeof(line), input_stream))!= NULL)
    			
    		{
    			if ((sscanf (line, "%d %d", &x, &y)) != 2)
    			{
    				no_values++;
    				fprintf (stdout, "%s\n", line);
    			}
    		}
    	}
    	
    	fprintf(stdout, "\n\n\n\nno_values: %d\n", no_values);
    	
    	for (i=0; i<=no_values; i++)
    		
    	{
    		sum_x= x;
    	}
    	
    	fprintf(stdout, "\n\n\n\nsum_x: %lf\n", sum_x);
    	
    	
    }
     
    Last edited by a moderator: Dec 13, 2006
  2. shabbir

    shabbir Administrator Staff Member

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