Matrix addition using multithreading.

pthread_matrix_add.c

#include <stdio.h>
#include <pthread.h>

#define T 2
#define N 4

int A[N][N] = {{1,0,1,0},{0,1,1,0},{1,0,1,0},{0,1,1,0}};
int B[N][N] = {{0,2,2,0},{2,0,2,0},{0,2,2,0},{2,0,2,0}};
int C[N][N] = {{0}};

void *matrix_add(void *arg) {
	int id = *(int*)arg;
	int i, j;

	for (i = id; i < N; i += T)
		for (j = 0; j < N; j++)
			C[i][j] = A[i][j] + B[i][j];

	pthread_exit(NULL);
}

int main()
{
        pthread_t thread[T];
        int tid[T];
	int i, j;

	for (i = 0; i < T; i++) {
		tid[i] = i;
		pthread_create(&thread[i], NULL, matrix_add, &tid[i]);
	}

	for (i = 0; i < T; i++)
		pthread_join(thread[i], NULL);

	for (i = 0; i < N; i++)
		for (j = 0; j < N; j++)
			printf((j < N-1) ? "%d " : "%d\n", C[i][j]);

	return 0;
}

sir how to solve it