c++ - Error: cannot convert 'int (*)[3]' to 'int (*)[100]' for argument '1' to 'void repl(int (*)[100], int, int)' -

hello im trying write program replace each negative number -1 , positive 1 error :

[error] cannot convert 'int ()[3]' 'int ()[100]' argument '1' 'void replace(int (*)[100], int, int)'

what mean ??

#include<iostream> using namespace std; void replace(int arr[][100],int rsize, int csize) {   for(int r=0;r<rsize;r++)   {     (int c=0;c<csize;c++)     {       if (arr[r][c]>0) arr[r][c]=1;       else if (arr[r][c]<0) arr[r][c]=-1;       else arr[r][c]=0;     }   }  }  int main() {     int a[4][3]={     {2,0,-5},     {-8,-9,0},     {0,5,-6},     {1,2,3}};      replace(a,4,3);      for(int i=0;i<4;i++)       (int j=0;j<3;j++)         cout<<a[i][j]<<" ";}cout<<endl;      system ("pause");     return 0; } 

you declared function void replace(int arr[][100],int rsize, int csize) - expects 2d array, 'inner' dimension being 100. pass int a[4][3] has 'inner' dimension 3. compiler can't convert it. dimensions used calculate memory position shift when using arr[x][y] (it equivalent *(arr + x * 100 + y). that's why compiler can't assign array 3 array 100.

if want replace work dimension change to: void replace(int* arr,int rsize, int csize). use *(arr + r*csize + c) access fields instead of arr[r][c]

even better solution: tagged question c++ - use c++ library :) - std::vector<std::vector<int> > or std::array (c++11)