c16rtomb() function in C/C++
Last Updated :
04 Sep, 2018
The c16rtomb() is a built-in function in C/C++ which converts 16 bit character representation to a narrow multibyte character representation. It is defined within the uchar.h header file of C++.
Syntax:
size_t c16rtomb(char* s, char16_t c16, mbstate_t* p)
Parameters: The function accepts three mandatory parameters as shown below:
- s: specifies the string where the multibyte character is to be stored.
- c16: specifies the 16 bit character to convert.
- p: specifies the pointer to an mbstate_t object used when interpreting the multibyte string.
Return Value: The function returns two values as shown below:
- On success of the program, the function returns the number of bytes written to the character array pointed to by s.
-
On failure, -1 is returned and EILSEQ is stored in err no.
Below programs illustrates the above function.
Program 1:
#include <iostream>
#include <uchar.h>
#include <wchar.h>
using namespace std;
int main()
{
const char16_t str[] = u "Ishwar Gupta" ;
char s[50];
mbstate_t p{};
size_t length;
int j = 0;
while (str[j]) {
length = c16rtomb(s, str[j], &p);
if ((length == 0) || (length > 50))
break ;
for ( int i = 0; i < length; ++i)
cout << s[i];
++j;
}
return 0;
}
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Program 2:
#include <iostream>
#include <uchar.h>
#include <wchar.h>
using namespace std;
int main()
{
const char16_t str[] = u "" ;
char s[50];
mbstate_t p{};
size_t length;
int j = 0;
while (str[j]) {
length = c16rtomb(s, str[j], &p);
if ((length == 0) || (length > 50))
break ;
for ( int i = 0; i < length; ++i)
cout << s[i];
++j;
}
return 0;
}
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Note: There is no output in the above program since it is a case of failure.
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