Cbsc4103 Software Construction|Output : Integer Assessment Answer
Lexical Analysis is the first phase of compiler also known as scanner. It converts the high level input program into a sequence of tokens.
Given a diagram in Figure 1 that shows the function of lexical analyzer.
a) What is a token?
b) Give example of tokens.
c) Give example of non-tokens.
d) A C++ program (ProjectTOKEN.cpp) has been developed to check if a string is a valid integer or not. Compile and run this program:
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#include using namespace std;
// This is a CPP program to check if a given string is a valid integer
bool isNumber(string s) { for (int i = 0; i < s.length(); i++) if (isdigit(s[i]) == false) return false;
return true; }
int main(int argc, char *argv[]) { // the input in string string str = "1234";
if (isNumber(str)) cout << "Input: " << str << "\tOutput : Integer"; else cout << "Input: " << str << "\tOutput : String"; return 0; } |
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Output: Input: 1234 Output : Integer Input: a1234 Output : String |
i. Provide the screenshot of THREE different output for the above program.
ii. Re-write the program (save as ProjectTOKEN2.cpp) by changing the input to be entered by the end user as shown in a sample of output below:
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Enter the Input (by user): 1234 Input: 1234 Output : Integer
Enter the Input (by user): a1234 Input: a1234 Output : String |
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