good time people
I have a code like the one below:

#include <vector>
#include <stdio.h>
#include "mymath.h"
using namespace std;
int main(){
    int n;
    char a='y';
    do{
        cout<<"\n----------------------------------------\n";
        cout<<"Enter a number for prime factorization : ";
        cin>>n;
        cout<<"\n----------------------------------------\n";
        int *result=pfact(n);
        for(int i;result[i][0]!=0;++i){
            if(result[i+1][0]!=0) cout<<result[i][0]<<"^"<<result[i][1]<<"*";
            else cout<<result[i][0]<<"^"<<result[i][1]<<"=";}
        cout<<n;
        cout<<"\n----------------------------------------\n";
        cout<<"Do you want to continue (y/n) ?  ";
        cin>>a;}while(a=='y');}

with having mymath.h like the one below:

#ifndef MYMATH_H_INCLUDED
#define MYMATH_H_INCLUDED

#endif // MYMATH_H_INCLUDED
#include <stdio.h>
#include <vector.h>
int *pfind(int num){
    int index=0,*prime;
    prime=new int[num];
    for(int i=1;i<=num;++i){
                int flag=0;
                for(int j=2;j<i;++j){
                    if(i%j==0){
                        ++flag;}}
                if(flag==0 && i>1){
                    prime[index]=i;
                    ++index;}}
            prime[index]=0;
            return prime;}
int *pfact(int num){
    int *prime=pfind(num/2);
    int re[num][2];
    int index=0;
    for(int i=0;prime[i]!=0;++i){
        for(int j=1;num%prime[i]==0;++j){
            re[index][0]=prime[i];
            re[index][1]=j;}
        ++index;}
        re[index][0]=0;
    return *re;}

when I run the program,I'll get six errors like:

error : invalid types 'int[int]' for array subscript

for every use of array result.
please help
thanks

Since you are just finding the prime factors of a number,how about something like this::

//fragment code where num is your real number 
if(num>0)
  {

    for(int i=1;i<=num;++i)
    {

      if(i==1)
      {
      cout<<i<<" ";//Can be done without it
      continue;//Don't dare get into a while loop with 1
      }

      while(num%i==0)
      {
      cout<<i<<" ";//Successively divide  any number
                    //as every composite number can 
                    // be expressed as multiple of  prime  numbers

      num/=i;

      }

    }

  }

You can't run this program; moreover, you can't compile it:

int *result=pfact(n); // You declare a pointer to int
for (int i; result[i][0] !=0; ++i) {
      // You are trying to subscript result
      if(result[i+1][0]!=0) ... 
      // result[i] is int and now you are trying
      // to index this int ???!!!

Never place function definitions in .h files (only function prototypes).

I have the same problem and get the same error.
Any ideea how I can initialise the matrix ?, in this case to make the result[0]=0;
Sorry if the question is too banal.

You can't run this program; moreover, you can't compile it:

int *result=pfact(n); // You declare a pointer to int
for (int i; result[i][0] !=0; ++i) {
      // You are trying to subscript result
      if(result[i+1][0]!=0) ... 
      // result[i] is int and now you are trying
      // to index this int ???!!!

Never place function definitions in .h files (only function prototypes).

Don't hijack old threads.

If you need to start a new thread with your question and post an example of your code.

This article has been dead for over six months. Start a new discussion instead.