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What is the output of the following C program? int x=1, y=2; int * const ptr...

What is the output of the following C program?
int x=1, y=2;
int * const ptr = &x;
ptr = &y;
printf("%d\n", *ptr);

What is the output of the following C program?
int x=1, y=2;
const int * ptr = &x;
ptr = &y;
printf("%d\n", *ptr);

What is the output of the following C program?
int x=1, y=2;
int * ptr = &x;
ptr = &y;
printf("%d\n", *ptr);

What is the output of the following C program?
int x=1, y=2;
const int * const ptr = &x;
ptr = &y;
printf("%d\n", *ptr);

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Answer #1 
Question 1:
It gives error 
assignment of read-only variable 'ptr'

Question 2:
2

Question 3:
2

Question 4:
It gives error 
assignment of read-only variable 'ptr'
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