MATLAB: How can create a loop to get value of n? for a known integration summation of 3.1515

MATLABnumerical integration

I've got the below code which get the value of s for n=100 , this is an example for Rectangular Numerical integration for F(x)= 4/1+x^2, I want to make a command to get the value of n? for s= 3.1515 , I've tried to do it with if command but for some reason I keep getting errors, I appreciate any help!
f = @(x) 4/(1+x^2);
a=0;b=1;s=0;
n=100
h=(b-a)/n;
for i=0:1:n-1 
  s=s+f(a+i*h);
end;
s=s*h;
fprintf("%f\n", s);

Best Answer

fprintf('%f\n', s);
Notice the use of ' instead of "
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