Day 10

• Reading: Read Chapter 6
• Lab 5 is due at beginning of lab today
• Lab 6 is due at beginning of lab next Tuesday
• Project 3 is due next Monday
• Lecture Topics
• Limiting string input so you don't go past the end of the array

char name[11];
scanf("%10s", name);

• Input Parameters (we've seen these before)

void printPoly(int x, int y)
{
    printf("%d", 3 * x * x + 7 * y - 4);
}

int calcPoly(int x, int y)
{
    return 3 * x * x + 7 * y - 4;
}

• Output Parameters
• Functions can return values through their parameters by passing the address of the parameter.

void readTenInts(int x[])
{
    int i;
    for(i = 0; i < 10; i++) {
       scanf("%d", &x[i]);
    }
}

void readRowCol(int *row, int *col)
{
    printf("Enter a row and col: ");
    scanf("%d %d", row, col);
}

int main(void)
{
    int r, c;
    readRowCol(&r, &c);
    printf("%d %d\n", r, c);
    return 0;
}

• Uses of '*' : multiplication, point declaration, dereference a pointer

3 * 4

void switchPlayer(char *player)
{
    if (*player == PLAYER_ONE) {
       *player = PLAYER_TWO;
    } else {
       *player = PLAYER_ONE;
    }
}

• Input/Output Parameters

void switchPlayer(char *player)
{
    if (*player == PLAYER_ONE) {
       *player = PLAYER_TWO;
    } else {
       *player = PLAYER_ONE;
    }
}