how to find values are within tol of on another or not?

i have the following code

that perform left sum and definate integral i have done it now i want to generate the output 1 if thes two valuse(leftsum and integral) are within tol of one another otherwise output 0

in myleftsum fuction f is function handel ,a and b are the real numbers a<b and n is an integer, tol is the positive number

function output=myleftcheck(f,a,b,n,tol)
syms x
    dx=(b-a)/n;
    % initialize r to f(a) (the left-end point of the first sub-interval
    % [a,a+dx])
    r=0;
    % need only consider the n-1 remaining sub-intervals
    for k=0:n-1
      c=a+k*dx;
      r=r+f(c);
    end 
    t=(dx*r);
    y=t
    
    o=int(f(x),a,b)
    if (o<=tol) & (tol<=t) 
output=1
    else
if (t<=tol) & (tol<=o) 
    output=1
    else
        output=0
end
    end

code is runnnig but output is not coming correct

for

myleftcheck(@(x) sin(x),0,3.14,10,0.001)

output=1

for

myleftcheck(@(x) sin(x),0,3.14,10,0.001)

output=0

[Voss]

You are calling myleftcheck two times with the same inputs and getting two different results? That's not what I get:

myleftcheck(@(x) sin(x),0,3.14,10,0.001)

y = 1.9833

o = 

output = 0

ans = 0

myleftcheck(@(x) sin(x),0,3.14,10,0.001)

y = 1.9833

o = 

output = 0

ans = 0

function output=myleftcheck(f,a,b,n,tol)
    syms x
    dx=(b-a)/n;
    % initialize r to f(a) (the left-end point of the first sub-interval
    % [a,a+dx])
    r=0;
    % need only consider the n-1 remaining sub-intervals
    for k=0:n-1
        c=a+k*dx;
        r=r+f(c);
    end 
    t=(dx*r);
    y=t
    
    o=int(f(x),a,b)
    if (o<=tol) & (tol<=t) 
        output=1
    else
        if (t<=tol) & (tol<=o) 
            output=1
        else
            output=0
        end
    end
end

Can you check that you have specified the two calls to myleftcheck correctly?