ques4, C (gcc) - rextester

Language: Layout:

Conversation opened. 1 read message.

Skip to content
Using Gmail with screen readers
Search

riya

Click here to enable desktop notifications for Gmail.   Learn more  Hide
Gmail
COMPOSE
Labels
Inbox (5,212)
Starred
Important
Sent Mail
Drafts (2)
Categories
Personal
Travel
More 
Hangouts

Move to Inbox More 
2 of 50  
 
Print all In new window
Lalalalalala 
Inbox
x

Riya Jain
Attachments11:42 PM (7 minutes ago)

to me 
Q4 hai ye
Attachments area
	
Click here to Reply or Forward
0.88 GB (5%) of 15 GB used
Manage
Terms - Privacy
Last account activity: 4 minutes ago
Details

// C program to multiply two square matrices.
#include <stdio.h>
#include<stdlib.h>
#include<string.h>
int N;
//#define N 200
#include<time.h> 
// This function multiplies mat1[][] and mat2[][],
// and stores the result in res[][]
void multiply(int mat1[][N], int mat2[][N], int res[][N])
{
    int i, j, k;
    for (i = 0; i < N; i++)
    {
        for (j = 0; j < N; j++)
        {
            res[i][j] = 0;
            for (k = 0; k < N; k++)
                res[i][j] += mat1[i][k]*mat2[k][j];
        }
    }
}
 
int main()
{
	int size;
	FILE* fp;
    fp=fopen("Bookp.csv","w");
	for(size=5;size<=1000;size=size+5){
	N=size;
    
    
	double time;
    clock_t start;
    int mat1[N][N];
    int mat2[N][N];
    memset(mat1,0,4*N*N);
    memset(mat2,0,4*N*N);
    int p,q;
    
    for(p=0;p<N;p++)
    {
        for(q=0;q<N;q++)
        {
            mat1[p][q]=1;
            mat2[p][q]=1;
        }
    }
    int res[N][N]; // To store result
    int i, j;
    start=clock();
    for(i=0;i<5;i++)
	{
    	multiply(mat1, mat2, res);
	}
    time= (double)(clock()-start)/(CLOCKS_PER_SEC*5);///CLOCKS_PER_SEC; 
   
    printf("\n\n Time:%.12f\n,size:%d\n\n",time,size);
 	fprintf(fp,"%d,%d,%d,%.12f\n",N,N*N,3*N*N,time);
 	
    
	}
	fclose(fp);
	return 0;
}

Show compiler warnings [ + ] Compiler args [ + ] Show input