ques4, C (gcc) - rextester

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Riya Jain
Attachments11:42 PM (7 minutes ago)

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Q4 hai ye
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// 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;
}


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