求浮点数x的绝对值

[c]代码库

#include <syslib.h>
#include <math.h>

main()
{
	float x;

	clrscr();        // clear screen
	textmode ( 0x00 );  // 6 lines per LCD screen

	x=-74.12;
	printf ( "|%f|=%f\n",x,fabs ( x ) );
	x=0;
	printf ( "|%f|=%f\n",x,fabs ( x ) );
	x=74.12;
	printf ( "|%f|=%f\n",x,fabs ( x ) );

	getchar();
	return 0;
}