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Programming and Problem Solving with C++

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  <td><font face="Times New Roman, Times, Serif" size="3">At first glance, the output does not seem right. If you count the characters by hand, you come up with three occurrences of 'i'. Note, however, that two of these are of 'I', not 'i'. If we want to count uppercase letters and lowercase letters as the same, we have to convert one of them (using, for example, the </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">tolower</font><font face="Times New Roman, Times, Serif" size="3"> or </font><font face="Courier New, Courier, Mono New, Courier, Mono" size="3">toupper</font><font face="Times New Roman, Times, Serif" size="3"> standard library functions).</font></td>
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  <td><font face="Times New Roman, Times, Serif" size="3">Testing: The test data for this program should include cases in which (1) there are no characters to be counted and (2) there is no text to count.</font></td>
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