/产生0--1之间的随机小数（精确到小数点后一位）include <stdlib.h> include include <stdio.h> void main(){ int i;double d;srand((unsigned)time(NULL));for(i=0;i <10;i++){ d=((double)rand())/RAND_MAX;printf( "d=%.1f\n ",d);} } ...
//下面这个代码可以测试这个值d = (double)f/(double)RAND_MAX;的范围是[0,1]#include <stdio.h>#include <stdlib.h>int main(){ int f= rand(); double d = (double)f/(double)RAND_MAX;//你的表达式值 while(d != 1)//测试值是否为1，如果可以输出Test End表示值可以为...
double x = rand() / (double )RAND_MAX , y = rand() / (double )RAND_MAX; well... what's the meaning of (double)? And what's the mean of RAN_MAX ... and what is its syntax with double? please reply ... I need help ...
for(inti=0;i<100;++i) data[i]=10.0*(-1.0+2.0*(double)rand()/2147483647); 在上例中,该实现版本中的 RAND_MAX 宏值是 2147483647。如果采用其他的编译器,RAND_MAX 的值可能会不一样。 如果编写的宏中包含了一个有操作数的表达式,应该把表达式放在圆括号内,以避免使用该宏时受运算符优先级的影响,进...
return probability > (double)rand() / RAND_MAX ? true : false; } int main() { double mass = 100; // 暗物质粒子质量(单位:GeV/c²) double recoilEnergy = 10; // 反冲能量(单位:keV) if (simulateDarkMatterScattering(mass, recoilEnergy)) { ...
import <Foundation/Foundation.h>int main (int argc, const char * argv[]){ NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; srand(time(0)); double random=rand()/(double)RAND_MAX; printf("%lf\n",random); [pool drain]; return 0;}多次运行结果...
2019-12-25 14:41 −C/C++怎样产生随机数:这里要用到的是rand()函数和srand()函数,C/C++里没有自带的random(int number)函数。(1) 如果你只要产生随机数而不需要设定范围的话,你只要用rand()就可以了:rand()会返回一随机数值, 范围在0至RAND_MAX 间。RA... ...
timeStep = timePerDiv * NUM_DIVISIONS / maxPoints; minValue =1e6; maxValue =-1e6; meanValue =0.; yScale =1.0/ voltsPerDiv;for(i=0; i<maxPoints; i++) { noise = noiseAmplitude * (rand()/(double)RAND_MAX -0.5); pData_[i] = AMPLITUDE * (sin(time*FREQUENCY*2*pi)) + nois...
h = ((double)rand()*height)/RAND_MAX; g.DrawRectangle(&bluePen,x,y,dx,h); x += dx; } } */ private: CPen m_RectPen; }; 值得一提的是,Windows Vista操作系统增加了对Double buffered paint的内建支持,这里有一篇文章介绍如何在Win32程序中使用这些API: ...
v = ub - delta_max *10*sqrt( -log( NOMAD::DEFAULT_EPSILON + ( i +NOMAD::RNG::rand()/NOMAD::D_INT_MAX ) * w ) );// there are no bounds: mapping [0;1] --> ]-INF;+INF[elsev = (NOMAD::RNG::rand()%2?-1.0:1.0) * delta_max *10*sqrt( -log( NOMAD::DEFAULT_EPSILON...