[Solved] What is the output of the program with reason?

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See annotations:

#include <stdio.h>

void f(int *p, int *q) // p contains address of i, q contains address of j
{
  p=q;                 // p now contains address of j
  *p=2;                // assigns 2 to j, not i
}

int main()
{
  int i=0,j=1;               // i contains 0, j contains 1
  f( &i, &j );               // call f with pointers to i and j
  printf( "%d%d\n", i, j );  // after call to f, i is unchanged, j contains 2
  return 0;
}

Output will be 02, not 21 or 22. The answer sheet you’re referring to is incorrect.

Edit

It’s a sad fact of life that many of the people teaching C programming don’t know the language that well.

solved What is the output of the program with reason?