Arrays and Strings

Question 1

What is the syntax to declare a one-dimensional integer array named data that can hold 10 elements?

Answer 1

int data[10];

Question 2

How do you initialize a one-dimensional array numbers with the values 1, 2, 3, 4, 5 during declaration?

Answer 2

int numbers[] = {1, 2, 3, 4, 5};

Question 3

How do you read 5 integer elements into an array M using a for loop and scanf()?

Answer 3

int M[5], i;
for (i = 0; i < 5; i++) {
printf(“Enter element %d: “, i + 1);
scanf(“%d”, &M[i]);
}

Question 4

What is the syntax for passing an entire one-dimensional array named myArray and its size to a function named processArray?

Answer 4

Function Prototype: void processArray(int arr[] or int* arr, int size);

Function Call: processArray(myArray, arraySize);

Question 5

How do you declare and initialize a 2D integer array (matrix) with 2 rows and 3 columns?

Answer 5

int matrix[2][3] = {{1, 2, 3}, {4, 5, 6}};

Question 6

What is a C string? How is it terminated?

Answer 6

A sequence of characters stored in a one-dimensional character array, terminated by a null character (\0).

Question 7

Name two string manipulation functions from <string.h> and their purpose.</string.h>

Answer 7

strlen(string): Returns the length of the string (excluding \0).

strcpy(destination, source): Copies the source string to destination.

strcat(destination, source): Concatenates source to the end of destination.

strcmp(string1, string2): Compares two strings.

Question 8

How do you declare a string variable myString that can hold up to 20 characters (including the null terminator)?

Answer 8

char myString[20];