cs50 pset1 water.c I am getting error while compiling - c

Question

following code is throwing compiling error. I am new to programming and so dont know what else to do. I did as taught in the class but cant get it right. cam anyone please help me solve it?
#include<stdio.h>
#include<cs50.h>
int main(void)
{
int y;
do
{
printf("Minutes: ");
int Minutes = get_int();
}
while(Minutes< 0);
y= Minutes * 12;
printf("Bottles: %i\n", y);
}
it is throwing following error:
water.c:10:8: error: unused variable 'Minutes' [-Werror,-Wunused-variable]
int Minutes = get_int();
^
water.c:12:7: error: use of undeclared identifier 'Minutes'
while(Minutes< 0);
^
water.c:14:4: error: use of undeclared identifier 'Minutes'
y= Minutes * 12;
^
3 errors generated.
make: *** [water] Error 1

Answer 1

You defined Minutes in the scope of the do block. That means it can only be used within that same scope - ie. between the {} enclosing the block.
You are however using the variable outside of that scope (twice in fact).
Instead, define Minutes before the do loop :
int Minutes = 0;
do {
printf("Minutes: ");
Minutes = get_int();
}
while(Minutes< 0);
This puts it in the scope of the main function body, so it can be used anywhere in the main function (after its definition).

Answer 2

int Minutes is declared local to the loop body, meaning that the loop condition while(Minutes< 0) has no idea what "Minutes" is.
Simply move the declaration out of the loop, above it.

Answer 3

This is the answer
#include <cs50.h>
#include <stdio.h>
int main(void)
{
printf("minutes: ");
int minutes = get_int();
printf("bottles: ");
int bottles = get_int();
printf("%i\n divided %i\n is %i\n", minutes, bottles, minutes / bottles);
}