code. compile. run. debug. share.
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//for inputs/outputs:
#include <iostream>
//just a preference for convenience:
using std::cout;
using std::cin;
using std::string;
//create our function with bool datatype just for convenience:
bool numbers_only(string funcsake)
{
//this loop compares each of the characters in the string to numbers.
int i = 0;
string target;
do
{
//this is setting "target" to the target character to be "scanned":
target = funcsake.substr(i, 1);
//this is "scanning" the target character (or just comparing to numbers):
if(target == "1");
else if(target == "2");
else if(target == "3");
else if(target == "4");
else if(target == "5");
else if(target == "6");
else if(target == "7");
else if(target == "8");
else if(target == "9");
else if(target == "0");
else return false;
//we return false if even one character is not a number:
//incrementing i for loop puposes:
i++;
}
while(i < funcsake.size());
//loop continues until an unrecognized character is found, or until the string's length is reached.
//if all checks, we return true:
return true;
}
int main()
{
//this is simple, you most likley will understand it:
cout << "Enter a number.\n";
string number;
cin >> number;
bool check = numbers_only(number);
if(check == true) cout << "You entered a valid number.\n";
else cout << "Error: Your string contains an unrecognized character.\n";
}
Compiling Program...
Standard Input:
Interactive Console
Text
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