把浮点数转换成字符串 gcvt

[c]代码库

int main ( void )
{
	char str[25];
	double num;
	int sig = 5; /* significant digits */
	/* a regular number */
	num = 9.876;
	gcvt ( num, sig, str );
	printf ( "string = %s\n", str );
	/* a negative number */
	num = -123.4567;
	gcvt ( num, sig, str );
	printf ( "string = %s\n", str );
	/* scientific notation */
	num = 0.678e5;
	gcvt ( num, sig, str );
	printf ( "string = %s\n", str );
	return ( 0 );
}