The "input" of a while loop is the condition statement.Recreate the functionality of a for loop using a while loop. The "input" of a for loop is a variable and a vector of values.for loops and while loops are not inherently different:
#Matlab for loop code
Rewrite the above code for the first 100 primes without using neither continue nor break. The keywords break and continue are not "needed'' per se, but they can make the code more elegant and readable. M=m+1 % increment primes count if m>=100 % if we have enough break % stop looking for primes end Sprintf( '%d is prime!\n',n) % this is quite an interesting command. It could have also been done % differently with an "if" statement, but this can be more elegant end While 1 % this means that unless we use "break", the loop will continue "forever"įlag=0 % reset flag for i=2: ceil( sqrt(n)) % no need to check numbers greater than the square-root of n if mod(n,i)=0 % means that i divides n exactlyįlag = 1 % to know that we found a divisorīreak % no need to remain in the for loop endĬontinue % to avoid the next line. Here's example code for a while loop that uses both break and continue to find the first 100 primes (not very efficiently, but it's only an example): n=1 It avoids the rest of the statements of the inner most loop, but continues in the loop (does not stop like break). The keyword continue is similar but different.
Here is an example that computes the "trajectory" of 6 but stops if it finds a 17 in it: s=6 % initialize s to 6 while s~=1 % as long as s is not equal to 1 stay in the loop if s=17 % if s equals 17 sprintf( 'Found 17 in the loop!!')Įnd if mod(s,2) % the actual "brains" of the iteration It will only terminate one loop (in the case of nested loop, the innermost one it is in) and will normally be protected by an if statement (otherwise the loop is silly).
The break keyword tells MATLAB® to exit the loop immediately. Similarly a for loop will run through all of its iterations. As you may recall, a while loop will evaluate all its statements without checking the condition.
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