Question

1. Prints out the size of (there’s a hint, by the way) variables with the following C data types – int, long, unsigned, long long, char, float and double. This is how many bytes of memory a variable of that type occupies on this machine, using your chosen compiler. (Xcode)

2. Answer the following question: Does adding the static keyword to the declaration of these variables in your program change their size?

3. Answer the following question: What is the largest number and smallest numbers that can be represented in the variables in your program with the following C data type – int, long, long long, unsigned, char. This is asking about the range of values, not just the size of the variable. Of course, you could Google this, but I strongly recommend that you construct a program that prints out these values, to ensure that they really are the limits of your particular compiler installation. Usually the needed values, such as MAX_INT, can be gotten from the limits.h file supplied with your compiler/IDE.

4. Answer the following question: Which of these types allow negative numbers to be meaningfully assigned as values? (int, unsigned, char, long)

Answer 1

1.

#include <iostream>

using namespace std;

int main() {
    cout << sizeof(int) << endl; // 4
    cout << sizeof(long) << endl; // 8
    cout << sizeof(unsigned) << endl; // 4
    cout << sizeof(long long) << endl; // 8
    cout << sizeof(char) << endl; // 1
    cout << sizeof(float ) << endl; // 4
    cout << sizeof(double) << endl; // 8
}

Does adding the static keyword to the declaration of these variables in your program change their size? => No

==========

#include <iostream>
#include <limits.h>
#include <cfloat>
#include <iomanip>

using namespace std;

int main() {
    cout << fixed << showpoint;
    cout << setprecision(4);    


    cout << INT_MIN << " " << INT_MAX << endl;
    cout << LONG_MIN << " " << LONG_MAX << endl;
    cout << 0 << " " << UINT_MAX << endl;
    cout << LLONG_MIN << " " << LLONG_MAX << endl;
    cout << CHAR_MIN << " " << CHAR_MAX << endl;
    cout << FLT_MIN << " " << FLT_MAX << endl;
    cout << DBL_MIN << " " << DBL_MAX << endl;
}

run this and you will get to see the ranges.

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every non-unsigned value allows negative numbers.