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use strict;

...
print "val2 = val1 + 5 = $val2\n";
#print "val3 = int(val2) = $val3\n";
print "val4 = val2 / exp = $val4\n";

Actual: 1.265
val1 = value x exp = 1265
val2 = val1 + 5 = 1270
val4 = va2 / exp = 1.27