C language file Operation 05--matrix (data) reading method

Data read
/*
===============================================================
Title: Read The matrix A, b from Test.txt, and calculate their product, output to the screen!
===============================================================
*/
#include <stdio.h>
#define M 3
#define N 5
void Main ()
{
FILE *FP;
int a[m][n],b[n][m],c[m][m];
int i,j,k;
Fp=fopen ("D:\\test.txt", "R");
if (fp==null)
printf ("File open failed!") \ n ");
Else
{
Read a, just like normal write, change scanf to FSCANF
printf ("Read Matrix a:\n");
for (i=0;i<m;i++)
for (j=0;j<n;j++)
FSCANF (FP, "%d", &a[i][j]);
for (i=0;i<m;i++)
{
for (j=0;j<n;j++)
printf ("%3d", A[i][j]);
printf ("\ n");
}

Read in B, just like normal write, change scanf to FSCANF
printf ("Read Matrix b:\n");
for (i=0;i<n;i++)
for (j=0;j<m;j++)
FSCANF (FP, "%d", &b[i][j]);
for (i=0;i<n;i++)
{
for (j=0;j<m;j++)
printf ("%3d", B[i][j]);
printf ("\ n");
}
Fclose (FP);
Multiplication of two-dimensional matrices
printf ("Matrix A and B product: \ n");
for (i=0;i<m;i++)
for (j=0;j<m;j++)
{
c[i][j]=0;
for (k=0;k<n;k++)
C[i][j]+=a[i][j]*b[j][i];
}
Output
for (i=0;i<m;i++)
{
for (j=0;j<m;j++)
printf ("%5d", C[i][j]);
printf ("\ n");
}
}
}
/*
========================================================================
Evaluation:

The reading of a two-dimensional array is actually a single fetch number, i.e. A[I][J];FSCANF (FP, "%d", &a[i][j]);

Use "R" when you save your data without any other characters, and a set of data is saved with a single file to ensure that the data can be

The reading sex.

========================================================================

*/

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C language file Operation 05--matrix (data) reading method