一小段C++程序,关于ltoa函数的

王朝c/c++·作者佚名  2006-02-01
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Example.

/* ltoa example */

#include <stdio.h>

#include <stdlib.h>

int main ()

{

int i;

char buffer [sizeof(long)*8+1];

printf ("Enter a number: ");

scanf ("%d",&i);

ltoa (i,buffer,10);

printf ("decimal: %s\n",buffer);

ltoa (i,buffer,16);

printf ("hexadecimal: %s\n",buffer);

ltoa (i,buffer,2);

printf ("binary: %s\n",buffer);

return 0;

}

Convert long integer value to string.

Converts a long integer value to a null-terminated string using the specified radix and stores the result in the given buffer.

If radix is 10 and value is negative the string is preceded by the minus sign (-). With any other radix, value is always considered unsigned.

buffer should be large enough to contain any possible value: (sizeof(long)*8+1) for radix=2.

Parameters.

value Value to be represented as a string. buffer Buffer where to store the resulting string. radix Numeral radix in which value has to be represented, between 2 and 36.

Return Value.

A pointer to the string.

Portability.

Not defined in ANSI-C. Supported by some compilers.

Output:

Enter a number: 16021977

decimal: 16021977

hexadecimal: f479d9

binary: 111101000111100111011001

 
 
 
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