# Tutorial dan Contoh User-defined Function Types C++

##### Artikel Terkait Tutorial C
For better understanding of arguments and return in functions, user-defined functions can be categorised as:
• Function with no argument and no return value
• Function with no argument but return value
• Function with argument but no return value
• Function with argument and return value
Consider a situation in which you have to check prime number. This problem is solved below by making user-defined function in 4 different ways as mentioned above.

## Function with no argument and no return value

``# include <iostream>using namespace std;void prime();int main() {    prime();      // No argument is passed to prime().    return 0;}// Return type of function is void because value is not returned.void prime() {    int num, i, flag = 0;    printf("Enter a positive integer enter to check: ");    cin>>num;    for(i = 2; i <= num/2; ++i){        if(num%i == 0) {            flag=1;             break;        }    }    if (flag == 1) {        cout<<num<<" is not a prime number.";    }    else {        cout<<num<<" is a prime number.";    }}``

## Function with no arguments but return value

``#include <iostream>using namespace std;int prime();int main() {    int num, i, flag = 0;    num = prime();     /* No argument is passed to prime() */    for (i = 2; i <= num/2; ++i) {        if (num%i == 0) {            flag = 1;            break;        }    }    if (flag == 1) {        cout<<num<<" is not a prime number.";    }    else {        cout<<num<<" is a prime number.";    }    return 0;}// Return type of function is intint prime() {    int n;    printf("Enter a positive integer to check: ");    cin>>n;    return n;}``

## Function with argument but no return value

``#include <iostream>using namespace std;void prime(int n);int main() {    int num;    cout<<"Enter a positive integer to check: ";    cin>>num;        prime(num);  // Argument num is passed to function.     return 0;}// There is no return value to calling function. */``
``// Hence, return type of function is void. ``*/  void prime(int n) {    int i, flag = 0;    for (i = 2; i <= n/2; ++i) {        if (n%i == 0) {            flag = 1;            break;        }    }    if (flag == 1) {        cout<<n<<" is not a prime number.";    }    else {        cout<<n<<" is a prime number.";    }}``

## Function with arguments and return value.

``#include <iostream>using namespace std;int prime(int n);int main() {    int num, flag = 0;    cout<<"Enter positive enter to check: ";    cin>>num;    flag = prime(num); /* Argument num is passed to check() function. */    if(flag == 1)        cout<<num<<" is not a prime number.";    else        cout<<num<<" is a prime number.";    return 0;}/* This function returns integer value.  */int prime(int n){    int i;    for(i = 2; i <= n/2; ++i){        if(n%i == 0)            return 1;    }    return 0;}``
All four programs above gives the same output and all are technically correct program. There is no hard and fast rule on which method should be chosen. The particular method is chosen depending upon the situation and how a programmer want to solve that problem.

Tag : Function with no argument and no return value, Function with no argument but return value, Function with argument but no return value, Function with argument and return value, Function with no argument, Function with argument.

Selain Sebagai Penyedia Panduan Belajar Database dan Tutorial Pemrograman, Kami Juga Membagikan Kumpulan Source Code Program Aplikasi dan Ebook Pemrograman Terlengkap yang Bisa Anda Dapatkan Secara Gratis di Halaman :

##### Rekomendasi Web Hosting
Hosting murah minimal order 1 bulan cuma 20rb. Gunakan voucher diskon 30%, kode voucher: MCP, total bayar hanya 14rb!!! Daftar sekarang