循环数组时显示“堆栈粉碎检测到 abc2 终止中止”

Question

When I try to compile the below code terminal says stack smashing detected abc2 terminated Aborted (core dumped) . This error shows when for loop going through the two dimensional array .

What I want to do is get user input to first column using cin>>arr[0][i]; and 0 for every other columns using arr[i+1][r]=0; .

#include <iostream>

    using namespace std;

    void displayArray(int arr[][4],int row,int col);
    int main(){
    int arr[3][4];
    for(int i=0;i<4;i++){
            cout<<"enter value ";
            cin>>arr[0][i];
            for(int r=0;r<3;r++){
                    arr[i+1][r]=0;
            }
    }



            displayArray(arr,3,4);

            return 0;
    }

    void displayArray(int arr[][4],int row,int col){
            for(int i=0;i<row;i++){
                    for(int r=0;r<col;r++){
                            cout<<arr[i][r]<<" ";
                    }cout<<endl;
            }

    }

Answer 1

You are going beyond the bounds of your array here:

int arr[3][4];
for(int i=0;i<4;i++){
 //...
   arr[i+1][r]=0; // <-- i+1 when i == 2 is going to give trouble
//...
}

If i >= 2 , you're writing to arr[3] , arr[4] , etc. This is a memory overwrite and the behavior then becomes undefined.

Obviously the fix is either to throttle the loop back so that i is always less than 2, or your array's first dimension needs to be increased from 2 to a bigger number.