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int main() {
  int i, arr[m][n], j, m, n;
  int max = 0;
  int *ptr;
 
  printf("enter the value m");
  scanf("%d", m);
  printf("enter the vaue of n");
  scanf("%d", n);
  ptr = (int*) malloc(m * n * 4);
  printf("enter the values\n");
 
  for (i = 0; i < m; i++)
  {
    for (j = 0; j < n; j++)
    {
      scanf("%d", ((ptr + i * n) + j));
    }
  }
 
  max = arr[0][0];
  for (i = 0; i < m; i++)
  {
    for (j = 0; j < n; j++)
    {
      if (max < *((ptr + i * n) + j));
      max = *((ptr + i * n) + j);
    }
  }
  printf("%d", max);
}

prog.c: In function ‘main’:
prog.c:2:14: error: ‘m’ undeclared (first use in this function)
   int i, arr[m][n], j, m, n;
              ^
prog.c:2:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:2:17: error: ‘n’ undeclared (first use in this function)
   int i, arr[m][n], j, m, n;
                 ^
prog.c:6:3: error: implicit declaration of function ‘printf’ [-Werror=implicit-function-declaration]
   printf("enter the value m");
   ^~~~~~
prog.c:6:3: error: incompatible implicit declaration of built-in function ‘printf’ [-Werror]
prog.c:6:3: note: include ‘<stdio.h>’ or provide a declaration of ‘printf’
prog.c:7:3: error: implicit declaration of function ‘scanf’ [-Werror=implicit-function-declaration]
   scanf("%d", m);
   ^~~~~
prog.c:7:3: error: incompatible implicit declaration of built-in function ‘scanf’ [-Werror]
prog.c:7:3: note: include ‘<stdio.h>’ or provide a declaration of ‘scanf’
prog.c:7:11: error: format ‘%d’ expects argument of type ‘int *’, but argument 2 has type ‘int’ [-Werror=format=]
   scanf("%d", m);
           ^
prog.c:9:11: error: format ‘%d’ expects argument of type ‘int *’, but argument 2 has type ‘int’ [-Werror=format=]
   scanf("%d", n);
           ^
prog.c:10:16: error: implicit declaration of function ‘malloc’ [-Werror=implicit-function-declaration]
   ptr = (int*) malloc(m * n * 4);
                ^~~~~~
prog.c:10:16: error: incompatible implicit declaration of built-in function ‘malloc’ [-Werror]
prog.c:10:16: note: include ‘<stdlib.h>’ or provide a declaration of ‘malloc’
prog.c:2:10: error: unused variable ‘arr’ [-Werror=unused-variable]
   int i, arr[m][n], j, m, n;
          ^~~
cc1: all warnings being treated as errors

Standard output is empty