Error:cannot find symbol getting

Question

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Write a C program to read two 2D arrays (A and B) of nxn size (n rows and n columns), perform A+B, and display the output matrix.
Input: 3 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 // first element is size n, next nxn elements are matrix A, remaining nxn elements are matrix B.

A=  
 1 2 3
 4 5 6
 7 8 9
B=
 1 2 3
 4 5 6
 7 8 9
Output:  
2 4 6
8 10 12
14 16 18
 
4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

2 4 6 8
10 12 14 16
18 20 22 24
26 28 30 32

C

#include<stdio.h>
int main(){  
int n;
scanf("%d",&n);  
    int A[n][n];  
int B[n][n];  
int C[n][n];  
       for (int i=0; i<n; i++){="" 
for="" (int="" j="0;" j<n;="" j++){
="" scanf("%d",&a[i][j]);="" 
}="" i="0;" i<n;="" scanf("%d",&b[i][j]);="" 
}
for="" c[i][j]="A[i][j]+B[i][j];
printf("%d",C[i][j]);
if(j!=n-1)
" printf("="" ");
}="" 

printf("\n");
}="" 
}
What I have tried:

I have tried:

codes/mainc-5557-1609819708.8775194.c: In function 'main':
codes/mainc-5557-1609819708.8775194.c:25:19: error: 'i' undeclared (first use in this function)
     printf("%d",C[i][j]);
                   ^
codes/mainc-5557-1609819708.8775194.c:25:19: note: each undeclared identifier is reported only once for each function it appears in
codes/mainc-5557-1609819708.8775194.c:25:22: error: 'j' undeclared (first use in this function)
     printf("%d",C[i][j]);
                      ^
I am getting like this .

Posted 4-Jan-21 17:13pm

Group 15005118

Updated 4-Jan-21 20:21pm

CPallini

v2

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Rick York · Answer 1 · 2021-01-04T17:40:00

You declared i in the for loop :

for (int i=0; i<n; i++) {

it needs to be declared outside the for loop, by where n is declared. The variable j also needs to be declared up there if they are to be accessed outside the for loop.

Also, I am surprised it is accepting your declarations of A, B, and C. I didn't think the C language allowed array variable declaration like that. I believe array dimensions must be a constant expressions.

CPallini · Answer 2 · 2021-01-04T20:21:00

With a 'modern' (supporting C99) C compiler, and a bit of cheating you might write

C

#include <stdio.h>
  
int main()
{
  int n;
  scanf("%d", &n);
  for (int r=0; r<n; ++r)
  {
    for (int c=0; c<n; ++c)
    {
      int x;
      scanf("%d", &x);
      printf("%d ", 2*x);
    }
    printf("\n");
  }
  return 0;
}

Error:cannot find symbol getting

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