Thread: assigning an string of arrays by loop

Salem's (obviously untested) code started the loop at 0 instead of 1, an easy mistake to make from "muscle" memory. It was supposed to be something like this.

Code:

#include <stdio.h>
#include <string.h>

#define SIZE 10

int main(void) {
    char a[SIZE][SIZE + 1];

    // fill array
    strcpy(a[0], "a"); // set first string to "a"
    for (int i = 1; i < SIZE; i++) { // start at second string
        strcpy(a[i], a[i - 1]); // copy previous string to this string
        strcat(a[i], "a");      // postpend another a
    }

    // print array
    for (int i = 0; i < SIZE; ++i)
        printf("%s\n", a[i]);

    return 0;
}

As an alternative to rstanley's last offering, instead of (implicitly) memsetting the array to 0's and adding the a's, you could memset it to a's and add the 0's! Overall I prefer rstanley's code, but there are many ways of doing it. Of course, you can obtain the output without the array at all, but I assume OP wants to fill the array for some unspecified (possibly unfathomable) reason.

Code:

#include <stdio.h>
#include <string.h>

#define SIZE 10

int main(void) {
    char a[SIZE][SIZE + 1];
    
    // fill array with a's
    memset(a, 'a', sizeof a);

    // This adds a "diagonal" of 0's to the array of a's
    for (int i = 0; i < SIZE; ++i)
        a[i][i + 1] = '\0';

    // print it
    for (int i = 0; i < SIZE; ++i)
        printf("%s\n", a[i]);

    return 0;
}

It fills the bytes of the array like this (0 means '\0')
a0aaaaaaaaa
aa0aaaaaaaa
aaa0aaaaaaa
aaaa0aaaaaa
aaaaa0aaaaa
aaaaaa0aaaa
aaaaaaa0aaa
aaaaaaaa0aa
aaaaaaaaa0a
aaaaaaaaaa0

Originally Posted by rstanley

Salem's code was wrong. She admitted it. I don't know what you mean by "looks more construct".

so, "looks more construct"

is basically, code which is more logical which takes less memory space and runs more efficiently, example:

instead of

Code:

printf("%d\n",inta1[0]);
printf("%d\n",inta1[1]);
printf("%d\n",inta1[2]);
printf("%d\n",inta1[3]);
printf("%d\n",inta1[4]);
printf("%d\n",inta1[5]);
printf("%d\n",inta1[6]);
printf("%d\n",inta1[7]);
printf("%d\n",inta1[8]);
printf("%d\n",inta1[9]);

you write

Code:

    for(int i=0;i<10;i++){
        
        printf("%d\n",inta1[i]);
    }

This is 1 example

Originally Posted by WaterSerpentM

i think they are the same word

Clearly you've never had a thought in your life.

Originally Posted by john.c

Clearly you've never had a thought in your life.

maybe you don't know, but most English words has other words like it with 's' in it that means the same thing. that's why there are so many 's' words in the dictionary =]



wonderful or fantastic

boat or ship

glide or soar

Base 30.
Uninitialized input.
Out-of-bounds access.
The trifecta!

so, at the moment

Code:

    int i;


    int int1[10];
    char chara1[10][10];
    char chara2[10][10];


    for(i=0;i<10;i++){


        int1[i] = i;
        itoa(int1[i],chara1[i],26);


        strcat(chara1[i],chara1[i-1]);








        printf("%s\n",chara1[i]);




    }

outputs

0
10
210
3210
43210
543210
6543210
76543210
876543210
9876543210




which is backwards lol

its supposed to output

0
01
012
0123
01234
012345
0123456
01234567
012345678
0123456789