Review

第一階段複習

Jason

上週作業講解

 void solve(char message[]) {
    srand(time(NULL));
    encrypt(message, t - (rand() % 1000));
    cout << message;
}

Can we assume the time() will return the same value?

Then we can get the same random values from rand()

Type, Variable, and Operator

Type 變數型別

int, char, long long, float, ...

Variable 變數

 type variableName (= initialValue);
 
int test = 10;
char c = 'a';
long long l = 2147483648;
 
c = 'k';

Review 第一階段複習 Jason

By jason-plainlog

	int a;

	cin >> a; // read integer from stdin
	cout << a + 50 << endl; // output result to stdout

	a += 10;
	a -= 20;
	a /= 5;
	a *= 10;

	char s1[] = "Hello?";
	char s2[10];

	strcpy(s2, s1);
	cout << s2 << endl;

	cout << strlen(s2) << endl;

	// print ascii value for each char in s2
	for(int i = 0; s2[i]; i++)
	cout << (int)s2[i] << endl;

	// concat two string
	char sa[] = "???";
	strcat(s2, sa);
	cout << s2 << endl;

	type variableName (= initialValue);

	int test = 10;
	char c = 'a';
	long long l = 2147483648;

	c = 'k';

	// passing parameters by value / address / reference
	int addA(int a, int *arr, int n){
	for(int i = 0; i < n; i++)
	arr[i] += a;
	}

	// swap(&a, &b);
	void swap2(int a, int b){
	int tmp = *a;
	a = b;
	b = a;
	}

	// swap(a, b);
	void swap1(int &a, int &b){
	int tmp = a;
	a = b;
	b = a;
	}

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