Lesson 11: Arrays

Array — group values of the same type

int a[5] = {10, 20, 30, 40, 50};
printf("%d\n", a[0]); // -> 10
printf("%d\n", a[4]); // -> 50

Array memory layout

Step execution — array with for loop

2D arrays

Declare and initialize

// 3 rows x 4 columns
int matrix[3][4] = {
    {1,  2,  3,  4},   // row 0
    {5,  6,  7,  8},   // row 1
    {9, 10, 11, 12}    // row 2
};

Memory layout

Traverse with nested loops

for (int i = 0; i < 3; i++) {        // row
    for (int j = 0; j < 4; j++) {    // column
        printf("%3d", matrix[i][j]);
    }
    printf("\n");
}

Try it yourself — array