how to copy 1-D array to 2-D array

Question

i have 1d Array and i have to copy in 2D Array like this

sDaysInMth[0] 31
sDaysInMth[1] 28
sDaysInMth[2] 31
sDaysInMth[3] 30
sDaysInMth[4] 31
sDaysInMth[5] 30
sDaysInMth[6] 31
sDaysInMth[7] 31
sDaysInMth[8] 30
sDaysInMth[9] 31
sDaysInMth[10] 30
sDaysInMth[11] 31

but Having problem in this code? i am not able to get correct answer.

    static char pvtsWsMthDayTab[24]="312831303130313130313031";
     char sDaysInMth[12][2] ;
     static char pvtsWsNbrDyMth[3]="";
     int i=0 , j = 0 ;

    memset(pvtsWsNbrDyMth,'\0', sizeof(pvtsWsNbrDyMth));
    memset(sDaysInMth, '\0', sizeof(sDaysInMth));    
     for(i=0; i< 12; i++)
     {
        memcpy(sDaysInMth[i], pvtsWsMthDayTab+(i*2), 2);

     }

    for(i=0;i<12;i++)
    {
        printf("%s ",sDaysInMth[i]); /* printing 2D array*/

        printf("\n");
     }

I am not sure I understand the question, please show what you have tried. — sergej, Oct 07 '15 at 08:32
I'm assuming op wants to split the array into "31", "28", "31", "30", " ... etc. — Component 10, Oct 07 '15 at 08:33
Welcome to stack overflow. Don't start your question title with how you feel, but rather a question or the problem you're facing. Your question is unclear and copying an array is fairly simple and has been answered many times. Also tagging C and C++ (multiple languages) is usually discouraged. — aslg, Oct 07 '15 at 08:34
The size of your array is wrong, your compiler should report excess of elements if warnings were enabled. — Iharob Al Asimi, Oct 07 '15 at 08:34
... similarly the target array will need to be of size **3** occurring 12 times. — Weather Vane, Oct 07 '15 at 08:39
[Copy strings in C](http://stackoverflow.com/questions/16645583/how-to-copy-char-array-to-another-char-array-in-c) — aslg, Oct 07 '15 at 08:40
@iharob The compiler will not report excess elements, because you are allowed to drop the null terminator when initializing a character array. See §6.7.9 paragraph 14 in the C11 specification. — user3386109, Oct 07 '15 at 08:50
You forget the final \0 in all your array `pvtsWsMthDayTab[24]` should be `pvtsWsMthDayTab[25]` `char sDaysInMth[12][2]` `char sDaysInMth[12][3]` — Ôrel, Oct 07 '15 at 12:51

score 0 · Accepted Answer · answered Oct 07 '15 at 12:58

You need a char for the final \0, I have used a loop to get the 2 char

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



int main(void) { 
    static char pvtsWsMthDayTab[25]="312831303130313130313031"; 
    char sDaysInMth[12][3] ; 

    memset(sDaysInMth, 0, sizeof(sDaysInMth)); 

    for(int i = 0; i < 12; i++) { 
        for (int j = 0; j < 2; j++ ) { 
            sDaysInMth[i][j] = pvtsWsMthDayTab[i * 2 + j ]; 
        } 
    } 

    for(int i = 0; i < 12; i++) { 
        printf("%s\n",sDaysInMth[i]); 
    } 


    return 0; 
}

how to copy 1-D array to 2-D array

1 Answers1