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rickysteed
2005-06-17 00:06 |
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这是我再 这边看的的一个程式 #define Epsilon 1.0E-6 /*控制解的精度*/ #include<math.h> main() { float a,x0,x1; printf("请输入要求的数:"); scanf("%f .. 访客只能看到部份内容,免费 加入会员 x0
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MarkTzen
2005-06-17 01:26 |
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查查msdn:
函式名称:fabs 说明: Calculates the absolute value of the floating-point argument. Function prototype: double fabs( double x ); 回传值: fabs returns the absolute value of its argument. There is no error return. Example: /* ABS.C: This program computes and displays * the absolute values of several numbers. */ #include <stdio.h> #include <math.h> #include <stdlib.h> void main( void ) { int ix = -4, iy; long lx = -41567L, ly; double dx = -3.141593, dy; iy = abs( ix ); printf( "The absolute value of %d is %d\n", ix, iy); ly = labs( lx ); printf( "The absolute value of %ld is %ld\n", lx, ly); dy = fabs( dx ); printf( "The absolute value of %f is %f\n", dx, dy ); } 输出结果: The absolute value of -4 is 4 The absolute value of -41567 is 41567 The absolute value of -3.141593 is 3.141593 x0 |