CODEWITHSUNDEEP
c
Ka Wa Yip
Ka Wa Yip

Reputation: 2993

C: Write into file as multiple columns

I have a long array position and in writing it as a single column I can do the following:

FILE *f = fopen("testing.txt", "w"); 
for (i=0; i<18; i++){
   fprintf(f,"%d\n",position[i]);
}

The output (in testing.txt) is like:

1
3
3
5
6
7
0
37
8
34
5
3
5
6
3
1
7
8

How can I print to file as:

1 7 5 1
3 0 3 7
3 37 5 8
5 8 6
6 34 3

as multiple columns each has maximum length 5?

Upvotes: 0

Views: 2873

Answers (4)

kostas aggelou
kostas aggelou

Reputation: 1

fprintf(f,"%d %d...%d\n",position[i],position[i+1]...position[i+n-1]);

but first fix your loop

Upvotes: 0

Vaduva Mihaita Bogdan
Vaduva Mihaita Bogdan

Reputation: 170

Original code

FILE *f = fopen("testing.txt", "w"); 
for (i=0; i<18; i++){
   fprintf(f,"%d\n",position[i]);
}

My guess for your request, if I understood it correctly, would be like this:

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

int main (){

int v[18] = {1,3,3,5,6,7,0,37,8,34,5,3,5,6,3,1,7,8};

int i = 0, adder = 0, done = 0;

while (1){
    if (done == 19)
        break;
    done++;
    if (i <= 18){
        printf("%d ", v[i]);
        i = i+5;
    }
    if (i > 18){
        printf("\n");
        adder++;
        i = adder;
    }
  }
}

You can add the file yourself. If you want an explanation, basically what I did was consider that we only have your 18 elements, and while I was not done with all of them, i counted each time I printed one of them, and when I printed them I made sure to print from 5 to 5 so that would be in a matrix form.

Upvotes: 0

ruirodrigues1971__
ruirodrigues1971__

Reputation: 342

your output is a little strange you have 4 elements in first and second line, and three elements in third and forth line. In general to maintain in the same line you can print " " or '\t' - tab

printf("%d ", 1);
printf("%d", 2);

or

printf("%d\t", 1);
printf("%d", 2);

When you need to make a new line you use '\n' (like you are using) You have to know how much elements that you need in each particular line to force then '\n'

Upvotes: 0

BLUEPIXY
BLUEPIXY

Reputation: 40145

like this

#include <stdio.h>

int main(void){
    int pos[] = {
        1,3,3,5,6,
        7,0,37,8,34,
        5,3,5,6,3,
        1,7,8
    };
    int len = sizeof(pos)/sizeof(*pos);
    int col_len = 5;
    for(int i = 0; i < col_len; ++i){
        for(int j = i; j < len; j += col_len){
            printf("%2d ", pos[j]);//fprintf(f, "%2d ", pos[j])
        }
        puts("");
    }
}

Upvotes: 2

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