draw triangle 3 Write a program which reads in three integers a, b, c, such that 0 < {a, b, c} <= 20 and a <= b. The program should print the + character a times, then a + c times, then a + c + c times, and so on. This pattern should repeat while the line is at most b characters long. At that point, the pattern is repeated backwards. For example input 4 7 1 will output: