creatematrix.c

在MPI上实现的矩阵相乘并行计算的源程序。

/*create a file which store a metrix with specific Row &Column
 in the file the first two int are the Row&column of the matrix*/
#include "stdio.h"
#include "stdlib.h"
#define MAX 20
#define INTSIZE sizeof(int)
#define CHARSIZE sizeof(char)
/*assume the max value of every element of that matrix */
int main() 
{
  char *filename;
  FILE *fd;
  int row,column;
  int i,j;/*loop variable*/
  int value; 
printf("Open a new file for write only!\n");
printf("WARING:If the file already exist,it will be truncated to zero length!\n"); 
  printf("Please enter file name:");
  filename=(char *)malloc(CHARSIZE*128);
  scanf("%s",filename);
/* printf("the filename is %s\n",filename);*/
 fd=fopen(filename,"w");
 if (fd==NULL)
/*CANNOT create the file and exit the system*/
 {
 printf("error in create the file %s\n",filename);
 exit(0);
}/*if*/
else 
  printf("Successfully create a new file %s\n",filename);
/*create a file for write only,or open a file and truncate it to zero length*/
  printf("Please input the ROW and COLUMN of the file please?\n");
  printf("Row:");
  scanf("%d",&row);
  printf("Column:");
  scanf("%d",&column);
  printf("Matrix Row=%d,column=%d\n",row,column); 
  printf("the first two int of the file write down number of the Row&column of the matrix!\n");
  fwrite(&row,INTSIZE,1,fd);
  fwrite(&column,INTSIZE,1,fd); 
 srand(getpid());/*reset the seed,and initialize the pseudo-random creation process*/
for (i=0;i<row;i++)
 {
    for (j=0;j<column;j++)
        {     value=MAX*rand()/(RAND_MAX+1);
            
              printf("%d ",value);
              fwrite(&value,INTSIZE,1,fd);
        } /*for  j*/
  printf("\n");
} /*for i*/
fclose(fd);
free(filename);
/*close the file fd*/
return(0);
}
/*main*/