matlab debugging

Find what is wrong in the given code and correct it to find the output. syms x f=input('give the function') a=input('lower limit') b=input('upper limit') n=input('number of intervals') z=int(f,a,b) value=0; dx=(b-a); for k=1:n c=a+k*dx; d=subs(f,x,c); value=value+c end value=dx*value z=int(f,a,b) rsums(f,a,b)