Valor Absoluto de un número en c++ – Accident – Money – Motor – Accident – Record

Elvalor absoluto de un número real es su valor numérico sin tener en cuenta su signo, sea este positivo o negativo,el valor absoluto se refiere a la distancia que existe desde un número al origen.

Ejemplo el valor absoluto de 3 es 3 a su vez el valor absoluto de -3 es 3.

--------------------------------------------------
-3 2 1 0 1 2 3

Sí observamos la recta real, la distancia que existe desde 0 a -3 es 3, similarmente de 0 a 3.

Para encontrar elvalor absoluto de un número en c++, haremos uso de la funciónabs de la libreríastdlib.h

Vamos a hacer un programa en c++ que nos pida que ingresemos por teclado un número entero cualquiera y nos imprima su valor absoluto.

#include iostream
#include stdlib.h
//#include
using namespace std;

int main(){
 int a;
 int absoluto;
 cout  "Ingrese un número"  endl;
 cin  a;
 absoluto = abs(a);
 cout  "El absoluto de "  a  " es "  absoluto;
 return 0;
}

Declaramos dos variables de tipo int y pedimos al usuario queingrese un número entero cualquiera. Posterior a estoguardamos el número en la variablea y obtenemos su valor absoluto con la funciónabs, el resultado lo guardamos en la variableabsoluto. Finalmente imprimimos el resultado.

Salida:

Ingrese un número

-5

El absoluto de -5 es 5

Vamos a hacer algo un poco mas interesante...

Realicemos un programa en c++ el cual nos generealeatoriamente 10 número enteros (positivos y negativos) y nos imprima su valor absoluto.

#include iostream
#include stdlib.h

using namespace std;

int main(){
 int a;
 for(int i = 0; i  10; i++){
 a = rand()%10 - 6;
 cout  "El absoluto de "  a  " es "  abs(a)  endl;
 }
 return 0;
}

Creamos una variablea de tipoint,posterior a esto hacemos un ciclo for que se repetirá 10 veces, en cada ciclo la variablea tomará un valor aleatorio que será el resultado derand()%10 - 6,donderand()%10 nosgenera un número aleatorio entre 0 y 9 (10 - 1) y a este número aleatorio lerestaremos 6 (con el objetivo de obtener números negativos en algunas ocasiones). Por último, imprimimos el número aleatorio guardado en la variablea y su valor absoluto obtenido por lafunción abs.

Salida:

El absoluto de -5 es 5
El absoluto de 1 es 1
El absoluto de -2 es 2
El absoluto de -6 es 6
El absoluto de 3 es 3
El absoluto de -2 es 2
El absoluto de 2 es 2
El absoluto de 2 es 2
El absoluto de -4 es 4
El absoluto de -2 es 2

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4. Algoritmo - Factorial de un número en C++
5. Matriz de la relación predecesor inmediato en c++.

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Abrir una direccion web con c++. – Phone – cancer

Para abrir direcciones web conc++ lo que haremos será usar la funciónsystem de la libreríastdlib.h de la siguiente manera:

system("start www.WebQueQuieresAbrir.com");

Donde"Start" abre la dirección y "www.WebQueQuieresAbrir.com" es la dirección que quieres abrir.

Un ejemplo de esto sería algo como:

system("start www.google.com");

Esto lo que hará será abrirwww.google.comen nuestro navegador predeterminado.

Veamos algo un poco más formal:

#include iostream
#include stdlib.h

using namespace std;

int main(){
 cout  "Presione enter para abrir www.google.com"  endl;
 system("pausenull");
 system("start www.google.com");
 cout  "Presione enter para salir"  endl;
 system("pausenull");
 return 0;
}

La consola nos dirá que presionemos la tecla enter para abrirgoogle.com, "system("pausenull");" se encargará de pausar el programa hasta que presionemos enter,"system("start www.google.com");" abrirá google.com en nuestro navegador predeterminado, y"system("pausenull");" nuevamente pausará el programa y luego de presionar la tecla enter (ó cualquiere otra) éste se cerrará.

Y si desean abrir más de una dirección web lo que deben hacer es usar la sentencia switch case, esto sería:

#include iostream
#include stdlib.h

using namespace std;

int main(){
 system("cls");
 cout  "Presione 1 y luego enter para abrir www.google.com"  endl;
 cout  "Presione 2 y luego enter para abrir www.youtube.com"  endl;
 cout  "Presione 0 y luego enter para salir"  endl;
 int opcion;
 cin  opcion;
 switch(opcion){
 case 1:
 system("start www.google.com");
 main();
 break;
 case 2:
 system("start www.youtube.com");
 main();
 break;
 case 0:
 exit(0);
 break;
 }
 return 0;
}

Contamos con dos opciones en la consola, la primera para abrirgoogle.com y la segunda para abriryoutube.com, escribimos "main()" al final de cadacase (antes del break) para que después de ejecutar cada opción siga dentro de lafuncion main, y un "system("cls");" para limpiar la pantalla luego abrir alguna web.

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