Creating C formatted strings (not printing them)

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Use sprintf. (This is NOT safe, but OP asked for an ANSI C answer. See the comments for a safe version.)

int sprintf ( char * str, const char * format, ... );

Write formatted data to string Composes a string with the same text
that would be printed if format was used on printf, but instead of
being printed, the content is stored as a C string in the buffer
pointed by str.

The size of the buffer should be large enough to contain the entire
resulting string (see snprintf for a safer version).

A terminating null character is automatically appended after the
content.

After the format parameter, the function expects at least as many
additional arguments as needed for format.

Parameters:

str

Pointer to a buffer where the resulting C-string is stored. The buffer
should be large enough to contain the resulting string.

format

C string that contains a format string that follows the same
specifications as format in printf (see printf for details).

... (additional arguments)

Depending on the format string, the function may expect a sequence of
additional arguments, each containing a value to be used to replace a
format specifier in the format string (or a pointer to a storage
location, for n). There should be at least as many of these arguments
as the number of values specified in the format specifiers. Additional
arguments are ignored by the function.

Example:

// Allocates storage
char *hello_world = (char*)malloc(13 * sizeof(char));
// Prints "Hello world!" on hello_world
sprintf(hello_world, "%s %s!", "Hello", "world");

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