sprintf
Syntax:
#include <cstdio> int sprintf( char *buffer, const char *format, ... );
The sprintf() function is just like printf(), except that the output is sent to buffer. The return value is the number of characters written. For example:
char string[50]; int file_number = 0; sprintf( string, "file.%d", file_number ); file_number++; output_file = fopen( string, "w" );
Note that sprintf() does the opposite of a function like atoi() – where atoi() converts a string into a number, sprintf() can be used to convert a number into a string. For example, the following code uses sprintf() to convert an integer into a string of characters:
char result[100]; int num = 24; sprintf( result, "%d", num );
This code is similar, except that it converts a floating-point number into an array of characters:
char result[100]; float fnum = 3.14159; sprintf( result, "%f", fnum );
Note that this function does not check the bounds of the buffer and therefore creates the risk of a buffer overflow. A secure alternative is snprintf