问用指针乘法2个矩阵

EN

#include <stdio.h>
#include<conio.h>
#include <stdlib.h>
#include <iostream>

/* Routines called. */
int loadMatrixFromFile(char *filename, int *data);
void showMatrix(int *data, int len);
int makeIdent(int matrixB[5][5], int length);
int matrixA[5][5];
int matrixB[5][5];
int matrixC[5][5];
void multiplyMatrices(int matrixA[5][5], int matrixB[5][5],int matrixC[5][5]);

int main(){
    int len, data[1000];
    len = loadMatrixFromFile("Numbers.txt", data);
    showMatrix(data, len);
    makeIdent(matrixB,len);
    multiplyMatrices(matrixA, matrixB, matrixC);
}

int makeIdent(int matrixB[5][5], int len){
    int i,j;
    printf("Matrix B is: \n");
    for(i=0;i<5;i++){
           for(j=0;j<5;j++){
                 if(i==j){
                         matrixB[i][j]=1;
                         printf("%d ",matrixB[i][j]);
                 }
                 else{
                     matrixB[i][j]=0;
                     printf("%d ",matrixB[i][j]);
                 }
           }
           printf("\n");
     }
    return matrixB[i][j];
     printf("\n");
}
int loadMatrixFromFile(char *filename, int *data){
    FILE *in;
    int len;
    int j;
    in = fopen(filename, "r");
    if (in == NULL) {
        printf("Could not find file: %s \n", filename);
    }
    else {
        printf("Reading numbers...\n");
        fscanf(in, "%d", &len);
        printf("reading %d numbers from file %s ....\n", len, filename);
        for(j=0;j<len;j++) {
            fscanf(in, "%d", data + j);
        }
        fclose(in);
    }
    for(int i = 0; i<5; i++){
        for(int j = 0; j < 5; j++){
                matrixA[i][j] = *(data + i*5 + j);
        }
    }
    return len;
}
void showMatrix(int *data, int len){
    int j;
    int count = 0;
    printf("Showing %d numbers from data array....\n", len);
    printf("Matrix A is: \n");
    for(j=0;j<len;j++) {
        printf("%d ", *(data + j));
        count++;
        if(count % 5 == 0){
            printf("\n");
        }
    }
    printf("\n");
}

void multiplyMatrices(int matrixA[5][5], int matrixB[5][5],int matrixC[5][5]){
     int i, n, j;
     int count = 0;

     printf("\n");
     printf("Matrix A x Matrix B is: \n");
     for (i = 0; i<5; i++){
            for (j = 0; j<5; j++){
                matrixC[i][j] = 0;
                matrixC[i][j] += matrixA[i][j]*matrixB[i][j];
                printf("%d ",matrixC[i][j]);
                count++;
                if(count % 5 == 0){
                printf("\n");
      }
    }
  }
}