用二分法求方程x^5+3x-1=0的最小正根,要求误差不小于0.000005

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x^5+3x-1=0 （C语言源码）：
/* Begin */
#include
#include
#define EXPR pow(x,5)+3*x-1
float Solve(float a,float b,float Err)
{float x = a;
float f1,f2;
while((b - a) > Err){f1 = EXPR;
x = (a + b) / 2;
f2 = EXPR;
if(f1 * f2 {b = x;x = a;}else{a = x;}}return x;
}int main()
{float ans;
ans = Solve(0,0.5,0.000005);
printf(%f,ans);
return 0;
}/* End */
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