Last active
May 30, 2018 13:39
-
-
Save not7cd/2ab9439f7ca10872ca1549634d68da50 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* example10-3.c */ | |
#include <stdlib.h> | |
#include <stdio.h> | |
/* https://www.eskimo.com/~scs/cclass/int/sx9b.html */ | |
void print_matrix(float **M, int n, int m) { | |
int i,j; | |
for (i=0; i<n; i++) | |
{ | |
for (j=0; j<m; j++) | |
{ | |
printf(" %10.3f",M[i][j]); | |
} | |
printf("\n"); | |
} | |
} | |
float** calloc_matrix(n, m) { | |
float **M = malloc(n * sizeof(float *)); | |
if(M == NULL) return EXIT_FAILURE; | |
int i,j; | |
for (i=0; i<n; i++) | |
{ | |
M[i] = calloc(m, sizeof(int)); | |
if(M[i] == NULL) return EXIT_FAILURE; | |
} | |
return M; | |
} | |
void copy_to(float **A, float **B, int n, int m) { | |
int i,j; | |
for (i=0; i<n; i++) | |
for (j=0; j<m; j++) | |
A[i][j] = B[i][j]; | |
} | |
void add_to(float **A, float **B, int n, int m) { | |
int i,j; | |
for (i=0; i<n; i++) | |
for (j=0; j<m; j++) | |
A[i][j] += B[i][j]; | |
} | |
void subtract_to(float **A, float **B, int n, int m) { | |
int i,j; | |
for (i=0; i<n; i++) | |
for (j=0; j<m; j++) | |
A[i][j] -= B[i][j]; | |
} | |
int main() | |
{ | |
int n, m; | |
printf("Enter matrix dim: "); | |
scanf("%i %i", &n, &m); | |
float **A = calloc_matrix(n, m); | |
float **B = calloc_matrix(n, m); | |
float **C = calloc_matrix(n, m); | |
float **D = calloc_matrix(n, m); | |
int i,j; | |
for (i=0; i<n; i++) | |
{ | |
for (j=0; j<m; j++) | |
{ | |
printf("A[%d][%d]: ",i,j); | |
scanf("%f",&A[i][j]); | |
} | |
} | |
for (i=0; i<n; i++) | |
{ | |
for (j=0; j<m; j++) | |
{ | |
printf("B[%d][%d]: ",i,j); | |
scanf("%f",&B[i][j]); | |
} | |
} | |
copy_to(C, A, n, m); | |
add_to(C, B, n, m); | |
copy_to(D, A, n, m); | |
subtract_to(D, B, n, m); | |
printf("A:\n"); | |
print_matrix(A, n, m); | |
printf("B:\n"); | |
print_matrix(B, n, m); | |
printf("C:\n"); | |
print_matrix(C, n, m); | |
printf("D:\n"); | |
print_matrix(D, n, m); | |
return EXIT_SUCCESS; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment