vectors and arrays

int main(){

int matrix[20];

int i;

for (i=0; iង i++) matrix[i] = i;

}

Remember: Array indices start at 0! So the “matrix[20]” will have elements 0 through 19.

int main(){

int matrix[] = {0,1,78,5};

}

You can initialize arrays this way...

int main(){

int *matrix;

int i;

matrix = new int[20];

for (i=0; iង i++) matrix[i] = i;

delete [] matrix;

}

You can use [] and pointer (*) interchangably.

You must delete arrays with the “delete []” operator.

int main(){

char *string;

int i;

string = new char[strlen(”hello”) +1];

strcpy (string,”hello”);

delete [] string

}

remember to allocate one extra element for the invisible “0” character in C-strings.

On the left is a veryfrequently found piece of code.