访问冲突写入位置c，2D动态数组

Question

亲爱的用户，我正在尝试将数据写入数组，但是由于某种原因，我一直都收到此错误。.请帮助我

int** input_array_dyn1(int n,int m) 
{
int i,**a; //index and array we want to set up.
a=(int**)calloc(n,sizeof(int*)); //get room for array in size n of ints.
assert(a); //checking that we have space.
for (i=0;i<n;i++)  //loop for getting value in each cell...
{
a[i]=(int*)calloc(m,sizeof(int)); //get room for array in size n of ints.
assert(a[i]); //checking that we have space.
}
return a; //returning the new array we made.
}

void randomMat(int** a,int n,int m)
 {
int i,j;
for(i=1;i<=n;i++)           
    for(j=1;j<=m;j++)
        a[i][j]=rand()%2;

printf ("you'r first matrix is:\n");
//print_mat(a,m,n);
}

我总是从a[i][j]=rand()%2;行中得到错误a[i][j]=rand()%2; Acces违反规定的位置，请帮帮我！

Answer 1

您会发现自己在input_array_dyn1和randomMat中的循环有所不同

比较例如

for (i=0;i<n;i++)  //loop for getting value in each cell...
{
a[i]=(int*)calloc(m,sizeof(int)); //get room for array in size n of ints.
assert(a[i]); //checking that we have space.
}

和

for(i=1;i<=n;i++)           
    for(j=1;j<=m;j++)
        a[i][j]=rand()%2;

如果数组具有n元素，则索引的有效范围是[0, n-1]