Greetings.
I have checked your codes. Nice work.
Found some little errors. Maybe you've mixed up rows & columns?

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#include <stdio.h>
#include <conio.h>

void main()
{
     int m,n,i,j;
     printf("Number of rows:");
     scanf("%i",&n);
     printf("Number of columns:");
     scanf("%i",&m);

     for (j=0; j<m; j++)  
          printf("$$");
     printf("\n");
     i=0;
     while (i<n-2)
     {
          printf("$$");
          for (j=0; j<m-2; j++) 
               printf("  ");
          printf("$$\n");
          i++;
     }
     for (j=0;j<m;j++) 
          printf("$$");
     printf("\n");
}

#include <stdio.h> #include <conio.h> void main() { int m,n,i,j; printf("Number of rows:"); scanf("%i",&n); printf("Number of columns:"); scanf("%i",&m); for (j=0; j<m; j++) printf("$$"); printf("\n"); i=0; while (i<n-2) { printf("$$"); for (j=0; j<m-2; j++) printf(" "); printf("$$\n"); i++; } for (j=0;j<m;j++) printf("$$"); printf("\n"); }

Are you sure?
You will print "number of columns" times "$$". In nufanvandal's first post, I understood that a column is made up of a "$$" and a line is made up of a "$$", "number of columns-2--minus 2 "$$-> the first and last columns". Tell me if I'm wrong