4. while do while

Nov 13, 2019Download as PPTX, PDF0 likes256 views

Brankica Jokić

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While petlja
Petlјa While se najčešće koristi ako broj ponavlјanja petlјe nije unaprijed poznat, nego zavisi o ispunjenju zadanog
uslova. Osnovni oblik While petlјe je:
while (uslov)
{
blok naredbi
}
naredba iza bloka
Kod ove vrste petlјi uslov se ispituje na početku, a blok naredbi petlјe
se ponavlјa sve dok je uslov istinit (različit od 0). Kada uslov postane
neistinit (false, 0), program se nastavlјa prvom naredbom iza petlјe.
Uslov može biti promjenjiva, aritmetički izraz ili logički izraz.
Kako se kod petlјe while uslov ispituje na početku može se dogoditi
da se blok naredbi u petlјi ne izvrši niti jednom.
Pošto petlјa for i while imaju ispitivanje uslova na početku vrijedi da
se svaka programska petlјa for može zamijeniti petlјom while i
obrnuto. Kada će se koristiti koja petlјa zavisi od samog programera i
njegovih navika.

1. Napiši program (While) koji ispisuje prirodne brojeve do broja n.
#include <iostream>
using namespace std;
int main()
{
int i,n;
cin>>n;
i=1;
while(i<n)
{
cout<<i<<" ";
i++;
}
return 0;
}

2.Napiši program (While) koji računa i ispisuje sumu prirodnih brojeva do broja n.
#include <iostream>
using namespace std;
int main()
{
int i,s,n;
cout<<"n= ";
cin>>n;
s=0;
i=1;
while(i<n)
{
s=s+i;
i++;
}
cout<<"Suma do "<< n <<" je "<<s<<endl;
return 0;
}

#include <iostream>
using namespace std;
int main()
{
int i,s,n,br;
cout<<"n= ";
cin>>n;
i=1;
br=0;
while(i<n )
{
if(i%2==0)
cout<<i<<" ";
if(i%2==0)
br=br+1;;
i++;
}
cout<<endl;
cout<<"parnih ima "<<br;
return 0;
}
Napišite program koji ispisuje parne brojeve i njihov broj do unesenog broja n.

Napišite program koji ispisuje cifre unesenog broja n.
#include <iostream>
using namespace std;
int main()
{
int i,n;
cout<<"n= ";
cin>>n;
while(n>0)
{
i=n%10;
n=n/10;
cout<<i<<" ";
i++;
}
cout<<endl;
return 0;
}

Do while petlja
U ovoj petlјi blok naredbi se izvodi sve dok je uslov
ispunjen, a izvešće se bar jedanput bez obzira na
tačnost uslova.
Uslov se ispituje nakon izvođenja bloka naredbi petlјe.
U ovome i jeste osnovna razlika između petlјi for i
while, i petlјe do while.
Zadatak 1. Napiši program koji računa i ispisuje sumu
parnih brojeva do broja n.
#include <iostream>
using namespace std;
int main()
{
int i,n,s;
cout<<"n= ";
cin>>n;
i=0;
s=0;
do
{
if(i%2==0)
s=s+i;
i++;
}
while(i<n);
cout<<"s= "<<s<<endl;
return 0;
}

Zadatak 2: Napiši program koji ispisuje sve unesene brojeve dok ne unesete 0. Nakon
unošenja 0 program prekida rad.
#include <iostream>
using namespace std;
int main()
{
int i;
cin>>i;
do
{
cin>>i;
}
while(i>0);
return 0;
}

Zadatak 3: Napiši program koji ispisuje najveći uneseni broj . Unos brojeva je sve dok ne unesete 0.
#include <iostream>
using namespace std;
int main()
{
int i,max;
cin>>i;
max=i;
do
{
cin>>i;
if(i>max) max=i;
}
while(i>0);
cout<<endl;
cout<<max;
return 0;
}

Zadaca 8.
1. Napisi program (While) koji ispisuje prirodne brojeve do broja n.
2. Napišite program koji ispisuje parne brojeve i njihov broj do unesenog broja n.
Ulaz:9 Izlaz: 2 4 6 8
Ulaz:9 Izlaz: 4
3. Napiši program koji ispisuje cifre unesenog broja n. Npr. N=305 Izkaz: 3 0 5
Do while
1. Do while! Napiši program koji ispisuje sumu parnih brojeva do broja n.
2. Napiši program koji ispisuje sve unesene brojeve dok ne unesete 0. Nakon unošenja 0 program prekida rad.
3. Napiši program koji ispisuje najveći uneseni broj . Unos brojeva je sve dok ne unesete 0.
4. Napiši program koji unosi brojeve sve dok ne uneste 0 i računa aritmeticku sredinu unesenih brojeva.
5. Napiši program koji sabira pozitivne brojeve sve dok ne unesete negativan broj. Nakon unosa negativnog broja program ispisuje sumu i
prekida rad.
6. Ispisati prirodne brojeve od 1 do 5 koji su djeljivi sa a.
7. Izračunati i ispisati sumu kvadrata prvih n prirodnih brojeva
8. Napisati program za ispis sume reciprocnih vrijednosti prvih n prirodnih brojeva.
9. Prebrojati prirodne brojeve u intervalu od 1 do n koji nisu djeljivi sa a.
10. Učitati visine i težinu za n osoba. Ispisati prosječnu, najmanju i najveću visinu i težinu.

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4. while do while

1. While petlja Petlјa While se najčešće koristi ako broj ponavlјanja petlјe nije unaprijed poznat, nego zavisi o ispunjenju zadanog uslova. Osnovni oblik While petlјe je: while (uslov) { blok naredbi } naredba iza bloka Kod ove vrste petlјi uslov se ispituje na početku, a blok naredbi petlјe se ponavlјa sve dok je uslov istinit (različit od 0). Kada uslov postane neistinit (false, 0), program se nastavlјa prvom naredbom iza petlјe. Uslov može biti promjenjiva, aritmetički izraz ili logički izraz. Kako se kod petlјe while uslov ispituje na početku može se dogoditi da se blok naredbi u petlјi ne izvrši niti jednom. Pošto petlјa for i while imaju ispitivanje uslova na početku vrijedi da se svaka programska petlјa for može zamijeniti petlјom while i obrnuto. Kada će se koristiti koja petlјa zavisi od samog programera i njegovih navika.

2. 1. Napiši program (While) koji ispisuje prirodne brojeve do broja n. #include <iostream> using namespace std; int main() { int i,n; cin>>n; i=1; while(i<n) { cout<<i<<" "; i++; } return 0; }

3. 2.Napiši program (While) koji računa i ispisuje sumu prirodnih brojeva do broja n. #include <iostream> using namespace std; int main() { int i,s,n; cout<<"n= "; cin>>n; s=0; i=1; while(i<n) { s=s+i; i++; } cout<<"Suma do "<< n <<" je "<<s<<endl; return 0; }

4. #include <iostream> using namespace std; int main() { int i,s,n,br; cout<<"n= "; cin>>n; i=1; br=0; while(i<n ) { if(i%2==0) cout<<i<<" "; if(i%2==0) br=br+1;; i++; } cout<<endl; cout<<"parnih ima "<<br; return 0; } Napišite program koji ispisuje parne brojeve i njihov broj do unesenog broja n.

5. Napišite program koji ispisuje cifre unesenog broja n. #include <iostream> using namespace std; int main() { int i,n; cout<<"n= "; cin>>n; while(n>0) { i=n%10; n=n/10; cout<<i<<" "; i++; } cout<<endl; return 0; }

6. Do while petlja U ovoj petlјi blok naredbi se izvodi sve dok je uslov ispunjen, a izvešće se bar jedanput bez obzira na tačnost uslova. Uslov se ispituje nakon izvođenja bloka naredbi petlјe. U ovome i jeste osnovna razlika između petlјi for i while, i petlјe do while. Zadatak 1. Napiši program koji računa i ispisuje sumu parnih brojeva do broja n. #include <iostream> using namespace std; int main() { int i,n,s; cout<<"n= "; cin>>n; i=0; s=0; do { if(i%2==0) s=s+i; i++; } while(i<n); cout<<"s= "<<s<<endl; return 0; }

7. Zadatak 2: Napiši program koji ispisuje sve unesene brojeve dok ne unesete 0. Nakon unošenja 0 program prekida rad. #include <iostream> using namespace std; int main() { int i; cin>>i; do { cin>>i; } while(i>0); return 0; }

8. Zadatak 3: Napiši program koji ispisuje najveći uneseni broj . Unos brojeva je sve dok ne unesete 0. #include <iostream> using namespace std; int main() { int i,max; cin>>i; max=i; do { cin>>i; if(i>max) max=i; } while(i>0); cout<<endl; cout<<max; return 0; }

9. Zadaca 8. 1. Napisi program (While) koji ispisuje prirodne brojeve do broja n. 2. Napišite program koji ispisuje parne brojeve i njihov broj do unesenog broja n. Ulaz:9 Izlaz: 2 4 6 8 Ulaz:9 Izlaz: 4 3. Napiši program koji ispisuje cifre unesenog broja n. Npr. N=305 Izkaz: 3 0 5 Do while 1. Do while! Napiši program koji ispisuje sumu parnih brojeva do broja n. 2. Napiši program koji ispisuje sve unesene brojeve dok ne unesete 0. Nakon unošenja 0 program prekida rad. 3. Napiši program koji ispisuje najveći uneseni broj . Unos brojeva je sve dok ne unesete 0. 4. Napiši program koji unosi brojeve sve dok ne uneste 0 i računa aritmeticku sredinu unesenih brojeva. 5. Napiši program koji sabira pozitivne brojeve sve dok ne unesete negativan broj. Nakon unosa negativnog broja program ispisuje sumu i prekida rad. 6. Ispisati prirodne brojeve od 1 do 5 koji su djeljivi sa a. 7. Izračunati i ispisati sumu kvadrata prvih n prirodnih brojeva 8. Napisati program za ispis sume reciprocnih vrijednosti prvih n prirodnih brojeva. 9. Prebrojati prirodne brojeve u intervalu od 1 do n koji nisu djeljivi sa a. 10. Učitati visine i težinu za n osoba. Ispisati prosječnu, najmanju i najveću visinu i težinu.

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4. while do while

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4. while do while