A pointer variable can take the address of a memory location as its value. Read the given program.
#include
main() {
int m = 30, n = 40, p, q, **r;
p = &m;
*p = 60;
q = &n;
*q = 80;
r = &p;
**r = 100;
printf("%d\n", m); // 1st printf statement
printf("%d\n", n); // 2nd printf statement
m = 30;
n = 90;
printf("%d\n", **r); // 3rd printf statement
1.The output of the 1st printf statement is ___.
