c++ string find last number
//Example
string str = "sdfsd34";
//Find the first first number and then all the number after
str.substr(str.find_first_of("0123456789"))
//Find the last number
size_t last_index = str.find_last_not_of("0123456789");
string result = str.substr(last_index + 1);first and last digit of a number in c++
// Program to find first and last
// digits of a number
#include <bits/stdc++.h>
using namespace std;
// Find the first digit
int firstDigit(int n)
{
// Find total number of digits - 1
int digits = (int)log10(n);
// Find first digit
n = (int)(n / pow(10, digits));
// Return first digit
return n;
}
// Find the last digit
int lastDigit(int n)
{
// return the last digit
return (n % 10);
}
// Driver program
int main()
{
int n = 98562;
cout << firstDigit(n) << " "
<< lastDigit(n) << endl;
return 0;
}Copyright © 2021 Codeinu
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