As the title says, I just want to paste this input into the program and then every number should be stored in 2D array.
Input:
172549683
645873219
389261745
496327851
813456972
257198436
964715328
731682594
528934167
My attempt:
#include <stdio.h>
int main() {
int array_2d[9][9];
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
scanf_s(" %d", &array_2d[i][j]);
}
}
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
printf("%d", array_2d[i][j]);
}
printf("\n");
}
}
This example shows how read whole number from a row and then split it into its digits that will be save into a 2D matrix.
#include <stdio.h>
int main() {
int array_2d[9][9];
int value = 0;
for (int i = 0; i < 9; i++) {
scanf("%d", &value);
int j = 8;
while (value != 0) {
array_2d[i][j--] = value % 10;
value = value / 10;
}
}
printf("\n\n");
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
printf("[%d]", array_2d[i][j]);
}
printf("\n");
}
}
Related
I'm making a program that multiplies 3 matrices and print the outcome. The program can input several cases of multiplication and each case can determined their own number of NxN matrix (n). However, if I input 2 cases, first with n=2 and second with n=3, the output of the first case will have a 3x3 matrix with row 3 and column 3 only have 0s. How do I fix this problem?
#include <stdio.h>
int main(){
int t, n, i, j, k, l, a[50][50][10], b[50][50][10], c[50][50][10], d[50][50][10], e[50][50][10];
scanf ("%d", &t);
for (l=1; l<=t; l++){
scanf("%d", &n);
// matrix a
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
scanf("%d", & a[i][j][l]);
}
}
// matrix b
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
scanf("%d", & b[i][j][l]);
}
}
// matrix c
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
scanf("%d", & c[i][j][l]);
}
}
//Multiplication
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
d[i][j][l] = 0;
for (k = 0; k < n; k++) {
d[i][j][l] += a[i][k][l] * b[k][j][l];
}
}
}
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
e[i][j][l] = 0;
for (k = 0; k < n; k++) {
e[i][j][l] += d[i][k][l] * c[k][j][l];
}
}
}
}
//Printing the product
for (l=1; l<=t; l++){
printf ("Case #%d:\n", l);
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
printf("%d ", e[i][j][l]);
}
printf("\n");
}
}
return 0;
}
This is the expected output.
Could someone help me please?
I need to perform the sum of two matrices that the data will be sent by the user and print the result in a new matrix.
I managed to capture the data from the two arrays, but when I try to add the two, the code does not print the sum, where is the error?
Thanks
#include <stdio.h>
#include <stdlib.h>
void sum(int *mat_A, int *mat_B, int *mat_C);
int main() {
int mat_A[4][4];
int mat_B[4][4];
int mat_C[4][4];
int i, j, value;
printf("\nEnter integer values for the elements of matrix A: \n");
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
{
printf("\nElement[%d][%d] = ", i, j);
scanf_s("%d", &value);
mat_A[i][j] = value;
}
}
printf("\nEnter integer values for the elements of matrix B: \n");
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
{
printf("\nElement[%d][%d] = ", i, j);
scanf_s("%d", &value);
mat_B[i][j] = value;
}
}
calc_soma(*mat_A, *mat_B, *mat_C);
printf("\nSum of matrices A with B: \n\n");
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
{
value = mat_C[i][j];
printf("%d", value);
}
printf("\n");
}
return 0;
}
void sum(int *mat_A, int *mat_B, int *mat_C) {
int i, j;
int value;
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
{
value = *mat_A + *mat_B;
*mat_C = value;
}
}
}
You need to declare the parameters to sum() as 2-dimensional arrays, not int *, which is a pointer to a 1-dimensional array. Then use i and j as array indexes.
You're also calling the function with the wrong name calc_soma.
#include <stdio.h>
#include <stdlib.h>
void sum(int mat_A[4][4], int mat_B[4][4], int mat_C[4][4]);
int main() {
int mat_A[4][4];
int mat_B[4][4];
int mat_C[4][4];
int i, j, value;
printf("\nEnter integer values for the elements of matrix A: \n");
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
{
printf("\nElement[%d][%d] = ", i, j);
scanf_s("%d", &value);
mat_A[i][j] = value;
}
}
printf("\nEnter integer values for the elements of matrix B: \n");
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
{
printf("\nElement[%d][%d] = ", i, j);
scanf_s("%d", &value);
mat_B[i][j] = value;
}
}
sum(mat_A, mat_B, mat_C);
printf("\nSum of matrices A with B: \n\n");
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
{
value = mat_C[i][j];
printf("%d", value);
}
printf("\n");
}
return 0;
}
void sum(int mat_A[4][4], int mat_B[4][4], int mat_C[4][4]) {
int i, j;
int value;
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
{
value = mat_A[i][j] + mat_B[i][j];
mat_C[i][j] = value;
}
}
}
I know that object oriented is not welcoming in c language but I still trying to work my way because it is possible as later languages based on c works good with objects
so my question is when I try to write a function outside of main it doesnt give me access and doesnt change values of wanted structs , see code below (I marked every things and included working functions inside the main) :
#include <stdio.h>
#include <stdlib.h>
static int RandomNum() {
int generate = rand() / 100000000;
while (generate >= 9) {
generate = rand() / 100000000;
}
return generate;
}
// Object Definition
typedef struct {
int a, b;
int Mat[2][4];
} Matrix2x4;
typedef struct {
int a, b;
int Mat[4][5];
} Matrix4x5;
typedef struct {
int a, b;
int Mat[4][5];
} Matrix2x5;
void PrintMat2x4(Matrix2x4 a) {
int row = a.a;
int col = a.b;
for (int i = 0; i < row; i++) {
printf("{%s", " ");
for (int j = 0; j < col; j++) {
printf("%d ,", a.Mat[i][j]);
}
printf("}%s\n", " ");
}
}
void PrintMat4x5(Matrix4x5 a) {
int row = a.a;
int col = a.b;
for (int i = 0; i < row; i++) {
printf("{%s", " ");
for (int j = 0; j < col; j++) {
printf("%d ,", a.Mat[i][j]);
}
printf("}%s\n", " ");
}
}
void PrintMat2x5(Matrix2x5 a) {
int row = a.a;
int col = a.b;
for (int i = 0; i < row; i++) {
printf("{%s", " ");
for (int j = 0; j < col; j++) {
printf("%d ,", a.Mat[i][j]);
}
printf("}%s\n", " ");
}
}
// NOT WORKING AS A SEPERATE FUNCTION SO I PUT IT INSIDE THE MAIN
/*static void MatrixMultiplication (Matrix2x4 a , Matrix4x5 b , Matrix2x5 c) {
for (int i = 0; i < a.b; i++){
for (int j = 0; j < b.b; j++){
for (int k = 0; k < a.b; k++){
c.Mat[i][j] = c.Mat[i][j]+(a.Mat[i][k]*b.Mat[k][j]);}}}
}
void setRandom (Matrix a) {
int row = ((int)(sizeof (a.Mat) / sizeof (a.Mat)[0])) ;
int col = ((int)(sizeof (a.Mat)[0] / sizeof (a.Mat)[0][0])) ;
for (int i = 0; i < row ; i++){
for (int j = 0; j < col; j++){
a.Mat[i][j] = RandomNum();}}}*/
void main() {
printf("%s\n\n", "Start..");
Matrix2x4 test = {2,4,{0}}; // <----- SIZE IS 2X4
int row = ((int)(sizeof(test.Mat) / sizeof(test.Mat)[0]));
int col = ((int)(sizeof(test.Mat)[0] / sizeof(test.Mat)[0][0]));
for (int i = 0; i < row; i++) {
for (int j = 0; j < col; j++) {
test.Mat[i][j] = RandomNum();
}
}
Matrix4x5 test2 = {4,5,{0}}; // <----- SIZE IS 4X5
int row2 = ((int)(sizeof(test2.Mat) / sizeof(test2.Mat)[0]));
int col2 = ((int)(sizeof(test2.Mat)[0] / sizeof(test2.Mat)[0][0]));
for (int i = 0; i < row2; i++) {
for (int j = 0; j < col2; j++) {
test2.Mat[i][j] = RandomNum();
}
}
Matrix2x5 mult = {2,5,{0}}; // <----- SIZE IS 2X5
PrintMat2x4(test);
printf("X\n");
PrintMat4x5(test2);
printf("=\n");
for (int i = 0; i < test.b; i++) {
for (int j = 0; j < test2.b; j++) {
for (int k = 0; k < test.b; k++) {
mult.Mat[i][j] = mult.Mat[i][j] + (test.Mat[i][k] * test2.Mat[k][j]);
}
}
}
PrintMat2x5(mult);
printf("\n\n%s", "End ---> ");
}
In order for this function to work:
static void MatrixMultiplication (Matrix2x4 a , Matrix4x5 b , Matrix2x5 c) {
for (int i = 0; i < a.b; i++){
for (int j = 0; j < b.b; j++){
for (int k = 0; k < a.b; k++){
c.Mat[i][j] = c.Mat[i][j]+(a.Mat[i][k]*b.Mat[k][j]);}}}
}
You must pass your structs as pointers:
static void MatrixMultiplication (Matrix2x4* a , Matrix4x5* b , Matrix2x5* c) {
for (int i = 0; i < a->b; i++){
for (int j = 0; j < b->b; j++){
for (int k = 0; k < a->b; k++){
c->Mat[i][j] = c->Mat[i][j]+(a->Mat[i][k]*b->Mat[k][j]);}}}
}
Your original function doesn't work outside of main, because C is making a copy of those structs for the function's own use. Therefore the original structs never get modified. Changing those parameters to pointers means that the function is working with the original structs.
The aim of the matrixMultiplier function is to multiply A * B, and then show the resulting matrix C, for any two square matrices A and B. A and B sizes are limited by 10*10.
When the user is asked the size of the matrix they wish to introduce, although A and B are 10*10, the function only works with the submatrices in A and B up to the dimension which the user has specified, say 3*3.
I've tested this out multiplying the 3*3 identity matrix by itself and it's not giving me the correct answer.
#include <stdio.h>
void matrixMultiplier(int A[][10], int B[][10], int C[][10], int n) {
int i, j, k;
for (i = 0; i < n; i++) {
for (k = 0; k < n; k++) {
C[i][k] = 0; /* Initialize output matrix to zero */
}
}
for (i = 0; i < n; i++) {
for (k = 0; k < n; k++) {
for (j = 0; j < n; j++) {
C[i][k] += A[i][j] * B[j][k];
}
}
}
printf("\n");
for (i = 0; i < n; i++) {
for (k = 0; k < n; k++) {
printf("%4d", C[i][k]);
}
printf("\n");
}
}
int main(void) {
int A[][10] = {{0}};
int B[][10] = {{0}};
int C[][10] = {{0}}; /* Initialize output matrix to zero */
int i, j;
int n;
printf("Enter square matrix dimension: ");
scanf("%d", &n);
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
printf("Assign a value: ");
scanf("%d", &A[i][j]);
}
printf("New row.\n");
}
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
printf("%4d", A[i][j]);
}
printf("\n");
}
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
printf("Assign a value: ");
scanf("%d", &B[i][j]);
}
printf("New row.\n");
}
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
printf("%4d", B[i][j]);
}
printf("\n");
}
matrixMultiplier(A, B, C, n);
return 0;
}
You need to use statically allocated arrays like this:
int A[10][10] = {{0}};
int B[10][10] = {{0}};
int C[10][10] = {{0}}; /* Initialize output matrix to zero */
As other commentators noticed, in C int A[][10] = {{0}}; is basically an equivalent of int A[1][10] = {{0}};, so only first rows are correctly set.
Take a look at this code:
#include <stdio.h>
#define MAX_SIZE 10
void matrixMultiplier(int A[][MAX_SIZE], int B[][MAX_SIZE], int C[][MAX_SIZE], int n)
{
int i, j, k;
for (i = 0; i < n; i++)
for (k = 0; k < n; k++)
for (j = 0; j < n; j++)
C[i][k] += A[i][j] * B[j][k];
printf("\nProduct Matrix C:\n\n");
for(i = 0; i < n; ++i)
{
for(j = 0; j < n; ++j)
printf("%4d", C[i][j]);
putchar('\n');
}
}
int main(void)
{
//int A[][10] = {{0}}; By initializing like this you are creating this int A[1][10] = {{0}};
int A[MAX_SIZE][MAX_SIZE] = {0};
int B[MAX_SIZE][MAX_SIZE] = {0};
int C[MAX_SIZE][MAX_SIZE] = {0};
int i, j, n;
printf("Enter square matrix dimension: ");
scanf("%d", &n);
printf("Input %d values row-wise, for matrix A: ", n*n);
for(i = 0; i < n; ++i)
for(j = 0; j < n; ++j)
scanf("%d", &A[i][j]);
printf("Input %d values row-wise, for matrix B: ", n*n);
for(i = 0; i < n; ++i)
for(j = 0; j < n; ++j)
scanf("%d", &B[i][j]);
printf("\nGiven Matrix A:\n\n");
for(i = 0; i < n; ++i)
{
for(j = 0; j < n; ++j)
printf("%4d", A[i][j]);
putchar('\n');
}
printf("\nGiven Matrix B:\n\n");
for(i = 0; i < n; ++i)
{
for(j = 0; j < n; ++j)
printf("%4d", A[i][j]);
putchar('\n');
}
matrixMultiplier(A, B, C, n);
return 0;
}
If you need more explanation about 2D arrays refer to this link
I have taken two 2d arrays but the output is very different from expected.It should merge two 2d arrays into one 1d array.I want to merge two arrays.Not add.Everywhere the information and examples are about merging two 1D arrays.Please help someone.I don't know where I am wrong.
#include <stdio.h>
void print(int a[][3],int m);
int main()
{
int array1[3][3];
int array2[3][3];
int arraySum[6][3];
int k = 0; //put into array;
int l = 10;
for(int i = 0; i < 3; i++)
{
for(int j = 0; j < 3; j++)
{
array1[i][j] = ++k; //fill from 1 to 10
array2[i][j] = ++l; //fill from 11 - 19
}
}
/*merge arrays*/
for(int i = 0; i < 6; i++)
{
for(int j = 0; j < 3; j++)
{
(i < 3) ? arraySum[i][j] = array2[i][j] : arraySum[i][j] = array1[i-3][j];
//fill arraySum with array2 and append with array1.
//just so that arraySum does not have any order
}
}
printf("Arrays before sorting");
printf("Array 1: ");
print(array1,3);
printf("Array2: ");
print(array2,3);
printf("arraySum");
print(arraySum,6);
/* bubble sort*/
for(int i = 0; i < 6; i++)
{
for(int j = 0; j < 3; j++)
{
for(int k = i+1; k < 6; k++)
{
for(int m = 0; m < 3; m++)
{
if(arraySum[i][j] > arraySum[k][m])
{
//swap
int temp = arraySum[i][j];
arraySum[i][j] = arraySum[k][m];
arraySum[k][m] = temp;
}
}
}
}
}
printf("\n\n Merged Array after sorting");
print(arraySum,6);
return 0;
}
void print(int a[][3],int m)
{
for(int i = 0; i < m; i++)
{
for(int j = 0; j < 3; j++)
{
printf("%d" , a[i][j]);
}
}
}
I want to merge two arrays.Not add.Everywhere the information and examples are about merging two 1D arrays.Please help someone.I don't know where I am wrong.
Please try this code,To Merge two 2d arrays into one 1d array in C
#include <stdio.h>
void print(int a[][3],int m);
int main()
{
int array1[3][3];
int array2[3][3];
int arraySum[6][3];
int k = 0; //put into array;
int l = 10;
for(int i = 0; i < 3; i++)
{
for(int j = 0; j < 3; j++)
{
array1[i][j] = ++k; //fill from 1 to 10
array2[i][j] = ++l; //fill from 11 - 19
}
}
/*merge arrays*/
for(int i = 0; i < 6; i++)
{
for(int j = 0; j < 3; j++)
{
(i < 3) ? (arraySum[i][j] = array2[i][j]) : (arraySum[i][j] = array1[i-3][j]);
//fill arraySum with array2 and append with array1.
//just so that arraySum does not have any order
}
}
printf("Arrays before sorting");
printf("Array 1: ");
print(array1,3);
printf("Array2: ");
print(array2,3);
printf("arraySum");
print(arraySum,6);
/* bubble sort*/
for(int i = 0; i < 6; i++)
{
for(int j = 0; j < 3; j++)
{
for(int k = i+1; k < 6; k++)
{
for(int m = 0; m < 3; m++)
{
if(arraySum[i][j] > arraySum[k][m])
{
//swap
int temp = arraySum[i][j];
arraySum[i][j] = arraySum[k][m];
arraySum[k][m] = temp;
}
}
}
}
}
printf("\n\n Merged Array after sorting");
print(arraySum,6);
return 0;
}
void print(int a[][3],int m)
{
for(int i = 0; i < m; i++)
{
for(int j = 0; j < 3; j++)
{
printf("%d" , a[i][j]);
}
}
}
I hope this code will be usefull.
Thank you.
I believe you're trying to be too smart with ternary operator, you can do it simpler way:
if (i < 3)
arraySum[i][j] = array2[i][j];
else
arraySum[i][j] = array1[i-3][j];
Listen to your compiler it would've told you what was wrong if you've compiled with -Wall -Wextra.
And if you insist on using ternary then this would probably be clearer:
arraySum[i][j] = (i < 3) ? array2[i][j] : array1[i-3][j];