#include<stdio.h>
#include<math.h>

int main(){
    double f,n,xm,sum=0;    
    const double PI = 3.14159;
    
    printf("Enter the Value of 'f'(CM) : ");
    
    scanf("%lf",&f);
    
    for (double i = 1; i < 8; i++)
    {
       printf("\nEnter the Value of 2Xm(cm) : ");        
       scanf("%lf",&n);        
       xm = (n/2);
    
       printf("%lf",i);
    
       double theta = atan(xm/f);        
       double theta_m = theta * ( 180.0 / PI );        
       double sine_theta = sin(theta);                
       double lambda = (0.0000508*sine_theta)/(i);
    
    
       printf("\nXm : %.2lf",xm);        
       printf("\nTheta : %.4lf",theta_m);        
       printf("\nSine Theta(m) : %.4lf",sine_theta);
       printf("\nlambda : %.4lf",lambda);
       printf("");
       sum+=lambda;        
    }
    
    return 0;   
}

字符串
使用这些值：

• f = 85
• xm = 2.2、4.4、6.7或9

对于“f = 2.2”，lambda值应该在6.5532e-07左右，对于6.7 = 6.6717333333333e-07，依此类推。
但每次都显示0。