Data file problem use FILE, loop, and if-else

This is what i have so far and I don't know if its right and i don't know how to finish it.
Can someone please show how this is done.

Suppose we have a data file that has 5 columns in each row. Write a C program that reads such an input file and prints out col1, col4, and the sum of col1 and col4 into output.txt for the rows whose col1 is less than 5 and col4 is greater than or equal to col5.

For instance, your program should process the following input.txt and generate the corresponding output.txt as follows: Please Click Link:

http://i86.photobucket.com/albums/k1...netic86/C1.jpg

If you can't see it let me know.

Code:

#include <stdio.h>

main ()
{
     int data file, col1, col 2, col3, col4, col5, output file 
     file * infp , * outfp ;
     
     infp = fopen("Columns Input.txt"); /*Input of File .txt*/ 
     outfp = fopen("Columns Output.txt"); /*Output of File .txt*/ 
     
     for (i=1; i<=9; i++)
     Fscanf (infp, "%d %d &col1,&col4);
     
     Output file = ( col1 + col4);
     
     fprint (outfp,"%d%d\n", data file, output file);
     
     if (col1 < 5)
     ?????
     ???
     ???
     
     if (col4>=col5)
     ??
     ??
     ???
     ??

Break the problem down to it's basics:

1) Input: You need to input all the data. Can you get the data input into variables like col1, col2, col3, col4, etc. We need one variable for each column, only.

A while loop might be good for opening and reading the file.

2) Processing: An if statement or two, and this is done, no problem

Write a C program that reads such an input file and prints out col1, col4, and the sum of col1 and col4 into output.txt for the rows whose col1 is less than 5 and col4 is greater than or equal to col5.

Code:

if((col1 < 5) && (col4 >= col5))  
{
   //print out col1, col4, and (col1 + col4)
}

3) Output: Here, you'll want to probably use fprintf()

Code:

fprintf("%d %d %d", col1, col4, (col1 + col4));

That should help get you going.

I have two different codes because i tried it 2 different ways i think. I have some examples with me and i just tried to follow thats how i did it, i know i probably did a mess but i tried it. I'm a beginner.
I still kind of lost and all help will appreciated.


1

Code:

#include <stdio.h>

main ()
{
     int col1, col 2, col3, col4, col5,  
     file * infp , * outfp ;
     
     infp = fopen("Columns Input.txt", "r"); /*Input of File .txt*/
     outfp = fopen("Columns Output.txt", "w"); /*Output of File .txt*/ 
     
     for (i=1; i<=count; i++)
     fscanf (infp, "%d %d %d %d %d", &col1,&col2,&col3,&col4,&col5);
     
     if((col1 < 5) && (col4 >= col5))  
{
     fprintf(outfp, "%d + %d = ", col1, col4, col1+col4);
     
     
     
     
     
     
     
     fclose(infp);
     fclose(outfp);
    
    
    return 0;
     
     }

2

Code:

#include<stdio.h>
#include<math.h>

int main(void)
{
    FILE *infp, *outfp;
    
    int col1, col2, col3, col4, col5, i, count;
    if ((infp = fopen("input.txt", "r"))==NULL{
              printf("input file cannot be opened\n");
              return -1;
               }

    if ((outfp = fopen("output.txt", "w"))==NULL){
               printf("output file cannot be opened\n");
               return -1;
               }
      
    for (i=1; i<=count; i++)
     fscanf (infp, "%d %d %d %d %d", &col1,&col2,&col3,&col4,&col5);
     
    if((col1 < 5) && (col4 >= col5))
     {
     fprintf(outfp, "%d + %d = ", col1, col4, col1+col4);
     
     
     
     fclose(infp);
     fclose(outfp);
    
    
    return 0;
     
     }

you havee problem with indentation wich leads to another problem you will see as sonn as indentation will be fixed

and you fprintf format has only two %d while you are trying to print 3 numbers