c++ program multiple declaraton error

I am getting multiple declaration error in this c++ program

#include<iostream.h>
#include<conio.h>
void main ()
clrscr();
int a[10][10],r,q,i;
cout<<"enter how many rows and colomn you want in the matrix:";
cin>>n;
cout<<"enter the matrix n";
for(int r=0;r<n;++r)

for(int q=0;q<n;++q)

cin>>a[r][q];



for(int i=0;i<n;i++)
cout<<"n the diagnol elements are:";
cout<<a[n-i-1][i];

getch();



it is a program for finding diagnol elements in a matrix

2 Answers
2

That's because you have already declared the r, q, i as int at line 5 as below:

r

q

i

int

int a[10][10],r,q,i;
^^^^^


While your three for loops, again re-declares for e.g. like this:

for(int r=0;r<n;++r)
^^^


So it re-declares the same variable in above case it's r, while the other for loop q and i which is not allowed.

r

q

i

Two ways to solve the problem:

a. Either you remove int from your for loop.

b. Either you remove declaration of variables used in for loop from line 5.

The only issue i am seeing is, you are not declaring the variable "n" . Other than that, everything seems to be fine.

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