可以帮忙看看为什么会求不出来吗？。。arccosx的值

Metaphor ZHANG 2021-04-15 02:02:46

#include <stdio.h>
#include <math.h>
#define pi 3.1415926
int main() {
double x,a,b,m,answer;
scanf("%lf",&x);
m=0.000001;
a=0;
b=pi;
answer=pi/2;
while(fabs(cos(answer)-x)>m)
{
if(cos(answer)-x>m){
b=answer;
}
else{
a=answer;
}
answer=(a+b)/2;
}
printf("%.5lf",answer);
return 0;
}

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Metaphor ZHANG 2021-04-16

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引用 1 楼 qzjhjxj的回复:

供参考：

#include <stdio.h>
#include <math.h>
#define pi 3.1415926
int main() {
    double x,a,b,m,answer;
    scanf("%lf",&x);
    m=0.000001;
    a=0;
    b=pi;
    answer=pi/2;
    while(fabs(cos(answer)-x)>m)
    {
        if(cos(answer)-x>m){
           a=answer;//b=answer;
        }
        else{
           b=answer;//a=answer;
        }
        answer=(a+b)/2;
    }
    printf("%.5lf",answer);
    
    return 0;
}

好的谢谢您！

qzjhjxj 2021-04-15

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供参考：

#include <stdio.h>
#include <math.h>
#define pi 3.1415926
int main() {
    double x,a,b,m,answer;
    scanf("%lf",&x);
    m=0.000001;
    a=0;
    b=pi;
    answer=pi/2;
    while(fabs(cos(answer)-x)>m)
    {
        if(cos(answer)-x>m){
           a=answer;//b=answer;
        }
        else{
           b=answer;//a=answer;
        }
        answer=(a+b)/2;
    }
    printf("%.5lf",answer);
    
    return 0;
}