Practice Problems On Arrays And Strings

#include <stdio.h> Copy Code
int main () {
int size;

// Input the size of the array
printf ("Enter the size of the array: ");
scanf ("%d", &size);

// Input the array elements
int arr[size];
printf ("Enter %d elements: ", size);
for ( int i = 0; i < size; i++) {
scanf ("%d", &arr[i]);
}

// Find the largest element in the array
int largest = arr[0];
for ( int i = 1; i < size; i++) {
if (arr[i] > largest) {
largest = arr[i];
}
}

// Display the result
printf ("The largest element in the array is: %d ", largest);

return 0;
}

#include <stdio.h> Copy Code
int main () {
int rows, columns;

// Input the dimensions of the matrices
printf ("Enter the number of rows: ");
scanf ("%d", &rows);
printf ("Enter the number of columns: ");
scanf ("%d", &columns);

// Input the elements of the first matrix
printf ("Enter elements of the first matrix: ");
int matrix1[rows][columns];
for ( int i = 0; i < rows; i++) {
for ( int j = 0; j < columns; j++) {
scanf ("%d", &matrix1[i][j]);
}
}

// Input the elements of the second matrix
printf ("Enter elements of the second matrix: ");
int matrix2[rows][columns];
for ( int i = 0; i < rows; i++) {
for ( int j = 0; j < columns; j++) {
scanf ("%d", &matrix2[i][j]);
}
}

// Perform matrix addition
int sumMatrix[rows][columns];
for ( int i = 0; i < rows; i++) {
for ( int j = 0; j < columns; j++) {
sumMatrix [i][j] = matrix1[i][j] + matrix2[i][j];
}
}

// Display the result
printf ("Sum of the matrices: ");
for ( int i = 0; i < rows; i++) {
for ( int j = 0; j < columns; j++) {
printf ("%d ", sumMatrix [i][j]);
}
printf (" ");
}

return 0;
}

#include <stdio.h> Copy Code
#define MAX_SIZE 10

int main () {
int firstMatrix[MAX_SIZE][MAX_SIZE], secondMatrix[MAX_SIZE][MAX_SIZE], result[MAX_SIZE][MAX_SIZE];
int rowFirst, colFirst, rowSecond, colSecond;

// Input dimensions of the first matrix
printf ("Enter the number of rows and columns of the first matrix: ");
scanf ("%d %d", &rowFirst, &colFirst);

// Input elements of the first matrix
printf ("Enter the elements of the first matrix: ");
for ( int i = 0; i < rowFirst; i++) {
for ( int j = 0; j < colFirst; j++) {
scanf ("%d", &firstMatrix[i][j]);
}
}

// Input dimensions of the second matrix
printf ("Enter the number of rows and columns of the second matrix: ");
scanf ("%d %d", &rowSecond, &colSecond);

// Input elements of the second matrix
printf ("Enter the elements of the second matrix: ");
for ( int i = 0; i < rowSecond; i++) {
for ( int j = 0; j < colSecond; j++) {
scanf ("%d", &secondMatrix[i][j]);
}
}

// Check if matrices can be multiplied
if (colFirst != rowSecond) {
printf ("Matrices cannot be multiplied. ");
return 1; // Exit with an error code
}

// Perform matrix multiplication
for ( int i = 0; i < rowFirst; i++) {
for ( int j = 0; j < colSecond; j++) {
result [i][j] = 0;
for ( int k = 0; k < colFirst; k++) {
result [i][j] += firstMatrix [i][k] * secondMatrix [k][j];
}
}
}

// Display the result
printf ("Product of the matrices: ");
for ( int i = 0; i < rowFirst; i++) {
for ( int j = 0; j < colSecond; j++) {
printf ("%d ", result [i][j]);
}
printf (" ");
}

return 0;
}

#include <stdio.h> Copy Code
#include <string.h>

int main () {
char str[100]; // Assuming a maximum length of 100 characters

// Input a string
printf ("Enter a string: ");
scanf ("%s", str);

// Calculate and display the length of the string
int length = strlen (str);
printf ("Length of the string: %d ", length);

return 0;
}

#include <stdio.h> Copy Code
#include <string.h>

int main () {
char str1[100], str2[100]; // Assuming maximum lengths of 100 characters

// Input two strings
printf ("Enter the first string: ");
scanf ("%s", str1);

printf ("Enter the second string: ");
scanf ("%s", str2);

// Concatenate the two strings
strcat (str1, str2);

// Display the concatenated string
printf ("Concatenated string: %s ", str1);

return 0;
}