110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
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#include <iostream>
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#include <ostream>
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#include <chrono>
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int main(void) {
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// Part 1
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std::cout << "! ------------- [Part 1] -------------" << std::endl;
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std::cout << "! Setting integer 1 and 2 to 4 and 5 respectively, directly"
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<< std::endl;
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int iNum = 4;
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int iNum2 = 5;
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std::cout << "! Creating pointer 1 and 2 with null pointer values"
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<< std::endl;
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int *pINum1 = nullptr;
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int *pINum2 = nullptr;
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std::cout << "! Setting pointer 1 and 2 to the memory addresses of integer 1 "
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"and 2 respectively"
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<< std::endl;
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pINum1 = &iNum;
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pINum2 = &iNum2;
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std::cout << "Pointer 1 address: " << pINum1 << std::endl;
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std::cout << "Integer 1 address: " << &iNum << std::endl << std::endl;
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std::cout << "Pointer 2 address: " << pINum2 << std::endl;
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std::cout << "Integer 2 address: " << &iNum2 << std::endl << std::endl;
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std::cout << "Integer 1 value (dereferenced from pointer 1): " << *pINum1
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<< std::endl;
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std::cout << "Integer 2 value (dereferenced from pointer 2): " << *pINum2
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<< std::endl;
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// Part 2
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std::cout << std::endl
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<< "! ------------- [Part 2] -------------" << std::endl;
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std::cout << "! Setting integer 1 value directly to 6" << std::endl;
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iNum = 6;
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std::cout << "Integer 1 value (directly): " << iNum << std::endl;
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std::cout << "Integer 1 value (dereferenced from pointer 1): " << *pINum1
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<< std::endl;
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// Part 3
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std::cout << std::endl << "------------- [Part 3] -------------" << std::endl;
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std::cout << "! Setting value referenced by pointer 1 to a 7" << std::endl;
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*pINum1 = 7;
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std::cout << "Integer 1 value (directly): " << iNum << std::endl;
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// Part 4
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std::cout << std::endl << "------------- [Part 4] -------------" << std::endl;
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std::cout << "! Setting pointer 2 address to the same as pointer 1"
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<< std::endl;
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pINum2 = pINum1;
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std::cout << "Pointer 2 address: " << pINum2 << std::endl;
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std::cout << "Value of pointer 2 dereference: " << *pINum2 << std::endl;
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std::cout << "! Setting underlying value of pointer 2 to 8" << std::endl;
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*pINum2 = 8;
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std::cout << std::endl
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<< "Integer 1 value (dereferenced from pointer 1): " << *pINum1
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<< std::endl;
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std::cout << "Integer 1 value (dereferenced from pointer 2): " << *pINum2
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<< std::endl;
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std::cout << "Integer 1 value (directly): " << iNum << std::endl << std::endl;
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std::cout << "Integer 2 value (directly): " << iNum2 << std::endl;
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// Part 5
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std::cout << std::endl << "------------- [Part 5] -------------" << std::endl;
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std::cout << "! Creating a double pointer with a null pointer value"
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<< std::endl;
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double *pDNum = nullptr;
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// pDNum = &iNum; error: cannot convert ‘int*’ to ‘double*’ in assignment
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// pDNum = pINum1; error: cannot convert ‘int*’ to ‘double*’ in assignment
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std::cout << "! Creating a double with value 14.25" << std::endl;
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double dNum = 14.25;
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std::cout << "! Setting double pointer to the memory address of the double"
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<< std::endl;
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pDNum = &dNum;
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std::cout << "Address of double (from double pointer): " << pDNum
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<< std::endl;
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std::cout << "Value of double (from double pointer): " << *pDNum << std::endl;
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std::cout << "! Assigning the value pointed at by pointer 1 to the value "
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"pointed at by the double pointer"
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<< std::endl;
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*pDNum = *pINum1;
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std::cout << "Value of double (directly): " << dNum << std::endl;
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std::cout << "Value of double (from double pointer): " << *pDNum << std::endl;
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}
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