Switch Case with Loop
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Hi!
I need help with this code:
clc;
clear;
close all;
a=input('Enter the real value of load impedance ZL, a=');
b=input('Enter the Imagninary value of load impedance ZL, b=');
ZL=a+1i*b;
disp(['ZL=',num2str(ZL),'ohm']);
a1=input('Enter the real value of characteristic Impedance Z0, a1=');
b1=input('Enter the imaginary value of characteristic Impedance Z0, b1=');
Z0=a1+1i*b1;
disp(['Z0=',num2str(Z0),'ohm']);
disp('Enter the R- To determine the Voltage reflection coefficient');
disp('Enter the V- To determine the VSWR');
disp('Enter the Z- to determine the impedance Zx from load');
c=input('Enter your choice','s');
switch c
case 'R'
rc=(ZL-Z0)/(ZL+Z0);
x=real(rc);
y=imag(rc);
q=sqrt(x^2+y^2);
VSWR=(1+q)/(1-q);
disp(['The VSWR is',num2str(VSWR)]);
case 'Z'
zx=Z0*((ZL+1i*Z0*tan((2*pi)*0.35))/(Z0+1i*ZL*tan((2*pi)*0.35)));
disp(['The Zx from load ZL is ',num2str(zx),'ohm']);
otherwise
error('invalid choice');
end
I do not wish for the program to just end with an 'Invalid Choice' statement. I would like to program to loop back automatically prompting me to re-enter the parameters starting from Line 4. I am unsure on how to use syntaxes such as "if-else" or "for" or "while" to execute this. Please help!! Thank you :)
采纳的回答
KSSV
2018-8-17
c=input('Enter your choice','s');
while ~any(strcmp(c,{'R' 'Z'}))
c=input('Enter your choice','s') ;
end
switch c
case 'R'
rc=(ZL-Z0)/(ZL+Z0);
x=real(rc);
y=imag(rc);
q=sqrt(x^2+y^2);
VSWR=(1+q)/(1-q);
disp(['The VSWR is',num2str(VSWR)]);
case 'Z'
zx=Z0*((ZL+1i*Z0*tan((2*pi)*0.35))/(Z0+1i*ZL*tan((2*pi)*0.35)));
disp(['The Zx from load ZL is ',num2str(zx),'ohm']);
end
2 个评论
Lahiru Suraweera
2021-4-16
hi.
what about a switch statement with numerical cases. i only want input between 1 and 12 to be accepted.
c = input('Please enter the number of the conversion required: ');
switch (c)
case 1
whatever the program must do
case 2
whatever the program must do
...
case 12
whatever the program must do
otherwise
disp('invalid choice')
end
Image Analyst
2021-4-16
That's fine. It can take pure numbers, like doubles, for the values on a "case" line.
更多回答（1 个）
Image Analyst
2018-8-17
0 个投票
You might want to look at the menu() function.
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