Show a nested loop which searches a two-dimensional array filled with random numbers uniformly distributed over 



[
1
,
…
,
20
]


{\displaystyle [1,\ldots ,20]}

.

The loops iterate rows and columns of the array printing the elements until the value 



20


{\displaystyle 20}

 is met.

Specifically, this task also shows how to break out of nested loops.



Related tasks

   Loop over multiple arrays simultaneously
   Loops/Break
   Loops/Continue
   Loops/Do-while
   Loops/Downward for
   Loops/For
   Loops/For with a specified step
   Loops/Foreach
   Loops/Increment loop index within loop body
   Loops/Infinite
   Loops/N plus one half
   Loops/Nested
   Loops/While
   Loops/with multiple ranges
   Loops/Wrong ranges


 
M = [rand(1:20) for i in 1:5, j in 1:10]
R, C = size(M)
 
println("The full matrix is:")
println(M, "\n")
 
println("Find the first 20:")
for i in 1:R, j in 1:C
    n = M[i,j]
    @printf "%4d" n
    if n == 20
        println()
        break
    elseif j == C
        println()
    end
end
 