I am trying to copy a 1D array of Strings into a 2D array of strings in C.
I was able to achieve this with integer enter image description here
//Here is what I tried for integers.
int main()
{
int arr[3][3];
int arr2[9]={1,2,3,4,5,6,7,8,9};
int i,j,k=0;
for(i=0; i<3;i++){
for(j=0; j<3;i++){
arr[j][i] = arr2[i];
//rintf("%d\n",arr2[i]);
}
}
for(i=0; i<3; i++) {
for(j=0; j<3; j++)
printf("%2d ", arr[j][i]);
printf("\n");
}
return 0;
}
I changed my data to char and I tried to run the same code I got a segmentation error. Here is what I have tried so far and it didnt work. error :Segmentation fault (core dumped)
#include<stdio.h>
#include<string.h>
int main()
{
char *d[3][3]; // Destination array
char *s[9]={"orange","apple","table","chair","cable","TV", "124","HI"}; // Source 1 Day array
int i,j,k=0;
for(i=0; i<3;i++){
for(j=0; j<3;i++){
strcpy(d[j][i], s[i]);
}
}
for(i=0; i<3; i++) {
for(j=0; j<3; j++)
printf("%s ", d[j][i]);
printf("\n");
}
return 0;
}
I have made some adjustment and now it print some weird strings
#include<stdio.h>
#include<string.h>
int main() {
char d[3][3] ={0}; // Destination array
char s[9][8]={"orange","apple","table","chair","cable","TV", "124","HI"}; // Source 1 Day array
int i,j,k=0;
for(i=0; i<3;i++){
for(j=0; j<3;j++){
d[j][i] = *s[i];
}
}
for(i=0; i<3; i++) {
for(j=0; j<3; j++)
printf("%s ", &d[j][i]);
printf("\n");
}
return 0;
}
This for loop
for(i=0; i<3;i++){
for(j=0; j<3;i++){
arr[j][i] = arr2[i];
//rintf("%d\n",arr2[i]);
}
}
is incorrect. In the inner loop there are used the same elements arr2[i]
where i
is changed from 0
to 2
inclusively.
You need to write
for(i=0; i<3;i++){
for(j=0; j<3;i++){
arr[j][i] = arr2[ 3 * i + j];
}
}
Another way to write loops is the following
for ( i = 0; i < 9; i++ )
{
arr[i / 3][i % 3] = arr2[i];
}
As for arrays of pointers of the type char * then the nested loops will look similarly
for(i=0; i<3;i++){
for(j=0; j<3;i++){
d[i][j] = s[ 3 * i + j];
}
}
provided that the array s is declared like
char * s[9]={"orange","apple","table","chair","cable","TV", "124","HI"};
And to output the result array you need to write
for(i=0; i<3; i++) {
for(j=0; j<3; j++)
printf("%s ", d[i][i]);
^^^^^^^
printf("\n");
}
As for your last program then it can look like
#include<stdio.h>
#include<string.h>
int main( void )
{
char d[3][3][8] ={0}; // Destination array
char s[9][8]={"orange","apple","table","chair","cable","TV", "124","HI"}; // Source 1 Day array
for( size_t i = 0; i < 3; i++ )
{
for ( size_t j = 0; j < 3;j++ )
{
strcpy( d[j][i], s[3 * i + j] );
}
}
for ( size_t i = 0; i < 3; i++ )
{
for ( size_t j = 0; j < 3; j++ )
{
printf( "%s ", d[i][j] );
}
putchar( '\n' );
}
return 0;
}