Prime / odd and even numbers C [closed]

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Prime / odd and even numbers C [closed]

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#1 by (3 votes)
#2 by (1 votes)

0

I want to make a program in C in which you are asked to enter numbers until you enter a "0" or a negative number, when this happens the program should show:

How many numbers were entered

How many numbers are cousins

How many numbers are even

How many numbers are odd

I have done practically each paragraph separately, but I do not know how I could put everything in the same program.

#include <stdio.h>
int main()
{
    int n, i, flag = 0;

    printf("Teclea un numero entero positivo: ");
    scanf("%d",&n);

    for(i=2; i<=n/2; ++i)
    {
        if(n%i==0)
        {
            flag=1;
            break;
        }
    }

    if (flag==0)
        printf("%d SI es un numero primo.",n);
    else
        printf("%d NO es un numero primo :(",n);
        getch();

    return 0;
}

c

asked by P. Garcìa 02.08.2017 в 19:14

source

2 answers

1

What you have to add is a loop to repeat the whole process that you already have, in this example I am using a while loop, although you could also use a do-while .

while (n > 0) {
//realizar proceso
}

Your code would be:

#include <stdio.h>
int main()
{
  int n=1, i, flag = 0;
  while (n > 0){
    printf("Teclea un numero entero positivo: ");
    scanf("%d",&n);

    for(i=2; i<=n/2; ++i)
      {
        if(n%i==0)
          {
            flag=1;
            break;
          }
      }

    if (flag==0)
      printf("%d SI es un numero primo.",n);
    else
      printf("%d NO es un numero primo :(",n);
    getch();
    printf("\n");
  }
  return 0;
}

Note : I initialized the variable n so that it can enter the loop.

answered by 02.08.2017 в 19:39

I can add a field that keeps 1 and 0 separated by semicolons invalid conversion from 'char' to 'const char'

score 3 · Accepted Answer

You could use something like this:

#include <stdio.h>

int esPrimo(int n)
{
    int i, cant = 0;
    for(i = 1; i <= n; i++)
    {
        if(n % i == 0)
            cant++;
    }
    if(cant == 2)
        return 1;
    else
        return 0;
}

int main(void)
{
    int n;
    int cantNum = 0, cantPrimos = 0, cantPar = 0, cantImpar = 0;

    printf("Teclea un numero entero positivo: ");
    scanf("%d",&n);
    while (n > 0)
    {
        cantNum++;
        if(n % 2 == 0)
            cantPar++;
        else
            cantImpar++;
        if (esPrimo(n))
            cantPrimos++;
        printf("Teclea un numero entero positivo: ");
        scanf("%d",&n);
    }
    printf("Cantidad de numeros ingresados: %d\n", cantNum);
    printf("Cantidad de numeros primos: %d\n", cantPrimos);
    printf("Cantidad de numeros pares: %d\n", cantPar);
    printf("Cantidad de numeros impares: %d\n", cantImpar);

    return 0;
}