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// 6.cpp
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <iomanip>
using namespace std;
void llenarMatriz(int **ptr, int nfil, int ncol);
void mostrarMatriz(int **ptr, int nfil, int ncol);
void liberaMemoria(int **ptr, int nfil);
int main(void){
int cnt=0;
int nfil,ncol;
int **ptr;
int **D;
cout<<"Dimension de la matriz: ";
cin>>nfil>>ncol;
//iii.Reservar memoria dinamicamente para ptr
ptr= new int*[nfil];
for (int f=0; f<nfil; f++)
ptr[f]= new int[ncol];
llenarMatriz(ptr, nfil, ncol);
cout<<"Matriz ingresada\n";
mostrarMatriz(ptr, nfil, ncol);
//cnt - cantidad de elem diferentes de cero
for (int i=0; i<nfil; i++){
for (int j=0; j<ncol; j++)
if (ptr[i][j]!=0)
cnt++;
}
float pceros = (float)(nfil*ncol-cnt)/(nfil*ncol);
cout<<"porc. ceros "<<pceros<<endl;
if (pceros<0.75)
cout<<"no es conveniente reducir\n";
else{
cout<<"es conveniente reducir\n";
//iii.Reservar memoria dinamicamente para D
D = new int*[cnt+1];
for (int f=0;f<cnt+1;f++)
D[f]= new int[3];
D[0][0] = nfil;
D[0][1] = ncol;
D[0][2] = cnt;
int k=1;
for(int i=0; i<nfil; i++)
for(int j=0; j<ncol; j++)
if(ptr[i][j]!=0){
D[k][0]=i;
D[k][1]=j;
D[k][2]=ptr[i][j];
k++;
}
cout<<endl;
cout<<"Matriz reducida\n";
for(int i=0; i<k; i++){
for (int j=0; j<3; j++)
cout<<D[i][j]<<" ";
cout<<endl;
}
}
liberaMemoria(ptr,nfil);
}
void mostrarMatriz(int **ptr,int nfil,int ncol){
for (int i=0;i<nfil;i++){
for (int j=0;j<ncol;j++)
cout<<setw(3)<<ptr[i][j];
cout<<endl;
}
}
void llenarMatriz(int **ptr,int nfil,int ncol){
cout<<"Ingrese valores a la matriz\n";
for (int i=0;i<nfil;i++){
cout<<"Ingrese "<<ncol<<" datos para la fila "<<i+1<<": ";
for (int j=0;j<ncol;j++)
cin>>ptr[i][j];
}
}
void liberaMemoria(int **ptr,int nfil){
for (int i=0;i<nfil;i++)
delete[] ptr[i];
delete[] ptr;
}
Compiling Program...
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