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-   -   how to work out the sum of a coloumn, in C (http://www.go4expert.com/forums/sum-coloumn-c-t2219/)

 nzrusty 12Dec2006 23:03

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

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);                 }```

 shabbir 13Dec2006 11:29

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

You have posted it as an Article under the Article / Source code section. I have moved it to the Queries and Discussion forum.

Duplicate of help pleas with program. Thread closed.

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