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main.cpp

#include <iostream> using namespace std; bool isNumeric(string str) { for (int i=0; i<str.length(); i++) if (isdigit(str[i]) == false) return false; return true; } int main() { string str; cout << "Enter a number: "; cin >> str; if (isNumeric(str)) cout << "This is a number" << endl; else cout << "This is not a number" << endl; return 0; }

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