Using if else statements instead of while - c

Question

Is there any way to write this program by only using if-else, else if statements instead of using while.
And I also want all the inputs just in one line, instead of
enter the number1:
enter the number2:
enter the number3:
enter the number4:
enter the number5:
it should be like
Enter 5 numbers: _ _ _ _ _
And when I write the same largest number twice, I want this program to show me the largest number as the second-largest number, too.
For example:
Enter 5 integers: -88 53 41 53 -17
The largest one is: 53
The second largest one is: 53
53 is the multiple of 53
53 and 53 is equal to each other.
53 is an odd number.
This is my code:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
int sayi = 0;
int sayac = 1;
printf("Sayiyi Girin:");
scanf("%d", &sayi);
//ilk sayinin en buyuk oldugunu kabul ediyoruz.
int enbuyuk = sayi;
int ikinci_buyuk = sayi;
while (sayac != 5)
{
sayac++;
printf("Sayiyi Girin:");
scanf("%d", &sayi);
/*kitapligi ilk sayinin en buyuk oldugunu farz ediyor
* eger ikinci sayi daha buyukse buyuk olanın yerini alacak
* ayrica ikincisinide kontrol edecek
*/
if (sayi > enbuyuk)
{
ikinci_buyuk = enbuyuk;
enbuyuk = sayi;
}
else if (sayi < enbuyuk)
{
// This to avoid if numbers are arranges descending
if (sayac == 2)
{
ikinci_buyuk = sayi;
}
else if (sayi > ikinci_buyuk)
{
ikinci_buyuk = sayi;
}
//This to avoid if the user entered two equal numbers
else if (enbuyuk == ikinci_buyuk)
{
ikinci_buyuk = enbuyuk;
}
}
}
printf("sayac: %d\n", sayac);
printf("En buyuk sayi: %d\n", enbuyuk);
printf("İkinci en buyuk sayi: %d\n", ikinci_buyuk);
if (enbuyuk % ikinci_buyuk != 0)
{
printf("%d %d nin tam kati degildir. is not the multiple of", enbuyuk, ikinci_buyuk);
}
else
{
printf(" %d %d nin tam katidir. is the multiple of", enbuyuk, ikinci_buyuk);
}
if (enbuyuk != ikinci_buyuk)
{
printf(" %d ve %d birbirine esit degildir. not equal each other", enbuyuk, ikinci_buyuk);
}
else
{
printf(" %d ve %d birbirine esitir. equal each other", enbuyuk, ikinci_buyuk);
}
if (enbuyuk % 2 != 0)
{
printf("%d tek sayidir. odd number", enbuyuk);
}
else
{
printf("%d cift sayidir.even number", enbuyuk);
}
system("pause");
return 0;
}

Answer 1

From the title of your question:
if-else are a conditional code flow structure without any repetition. Without any other instruction (like goto for example) you can't make it a loop like while.
But I think this is not the core of your question. You seem to want to read 5 numbers and check them. For now you do this in a loop and you like to replace that loop with something else.
You can print the one and only prompt and then call a function for each of the 5 numbers to check them.
Since your variables are not translated and your intend is not clear, I'll leave the code inside the function as an exercise for you.
printf("Enter 5 integers: ");
for (int i = 1; i <= 5; ++i)
{
readnumber(/* you might need arguments */);
}
The function will read and check one number. scanf() will read just one number and leave the remainder of the input line for some next call.
void readnumber(/* see above */)
{
if (scanf("%d", &number) == 1)
{
/* handle the number */
}
else
{
/* handle the scan error */
}
}

Answer 2

You can read 5 numbers simply by prompting with a single printf() and reading into 5 variables, or 5 array elements with a single scanf():
#include <stdio.h>
#include <stdlib.h>
int main(void) {
int a[5];
int first, second, i, j;
printf("Enter 5 numbers: ");
if (scanf("%d%d%d%d%d", &a[0], &a[1], &a[2], &a[3], &a[4]) != 5) {
printf("Invalid input\n");
return 1;
}
/* I cannot adapt the rest of the code because I cannot understand your language */
/* Here is my quick implementation from the desired output */
/* select the 2 largest numbers */
for (i = 0; i < 2; i++) {
for (j = i + 1; j < 5; j++) {
if (a[i] < a[j]) {
int tmp = a[i];
a[i] = a[j];
a[j] = tmp;
}
}
}
first = a[0];
second = a[1];
printf("The largest one is: %d\n", first);
printf("The second largest one is: %d\n", second);
if (second != 0 && first % second == 0)
printf("%d is a multiple of %d\n", first, second);
if (first == second)
printf("%d and %d are equal\n", first, second);
if (first % 2 != 0)
printf("%d is an odd number.\n", first);
return 0;
}