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Need help with Loops

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I didn't understand how to do the loops with these class note questions:
Thank you if anyone can help me.

Write a program to the following specifications.
         1) Input two integers, for the start and end of an ascii code chart.
                  a) If the two integers are out of order, swap them.
                  b) If the start integer is less than 32, set it to 32.
                  c) If the end integer is greater than 255, set it to 255.
         2) Declare a named constant for the number of characters per line, such as 10
         3) For each number from start to end, inclusive, print out the number followed by a colon ( followed by the character with that ascii code followed by a space. (Hint: use a typecast.)
         4) Count the number of characters on the line as you print them. ┬áIf the count is equal to your named constant, set the count back to o and go to the next line.

Sample run, with 10 as the named constant's value:
start? 120
end? 62

62:> 63:? 64:@ 65:A 66:B 67:C 68:D 69:E 70:F 71:G
72:H 73:I 74:J 75:K 76:L 77:M 78:N 79:O 80:P 81:Q
82:R 83:S 84:T 85:U 86:V 87:W 88:X 89:Y 90:Z 91:[
92:\ 93:] 94:^ 95:_ 96:` 97:a 98:b 99:c 100:d 101:e
102:f 103:g 104:h 105:i 106:j 107:k 108:l 109:m 110:n 111:o
112:p 113:q 114:r 115:s 116:t 117:u 118:v 119:w 120:x
lowercase baba
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And what have you done so far?
Could you hold this kitten for a sec? I need to adjust this tiny ad:
a bit of art, as a gift, that will fit in a stocking
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