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037_ModifyANumberToAnother.c
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037_ModifyANumberToAnother.c
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// Coding Interviews: Questions, Analysis & Solutions
// Harry He
#include <stdio.h>
int bitsToModify(int number1, int number2)
{
int temp = number1 ^ number2;
// the number of 1 bits in temp
int bits = 0;
while(temp != 0) {
++bits;
temp = (temp - 1) & temp;
}
return bits;
}
// ======== Test Code ========
void test(char* testName, int number1, int number2, int expected)
{
if(testName != NULL)
printf("%s begins: ", testName);
if(bitsToModify(number1, number2) == expected)
printf("Passed.\n");
else
printf("FAILED.\n");
}
void test1()
{
int number1 = 0;
int number2 = 13;
int expected = 3;
test("Test1", number1, number2, expected);
}
void test2()
{
int number1 = 0;
int number2 = 15;
int expected = 4;
test("Test2", number1, number2, expected);
}
void test3()
{
int number1 = 7;
int number2 = 0;
int expected = 3;
test("Test3", number1, number2, expected);
}
void test4()
{
int number1 = 7;
int number2 = 7;
int expected = 0;
test("Test4", number1, number2, expected);
}
void test5()
{
int number1 = 7;
int number2 = 15;
int expected = 1;
test("Test5", number1, number2, expected);
}
int main(int argc, char* argv[])
{
test1();
test2();
test3();
test4();
test5();
}