string to int in c++
#include <iostream>
#include <string>
using namespace std;
int main() {
string s = "10";
try
{
int i = stoi(s);
cout << i << '\n';
}
catch (invalid_argument const &e)
{
cout << "Bad input: std::invalid_argument thrown" << '\n';
}
catch (out_of_range const &e)
{
cout << "Integer overflow: std::out_of_range thrown" << '\n';
}
return 0;
}how to convert string to int in c++
string s = "123";
int n = s.size();
int num = 0;
for(int i = 0 ; i<n;i++)//this what stoi built function do XD
{
num = num*10+(s[i]-'0');
}string to int c++
#include <iostream>
#include <string>
// namespace because why not
namespace dstd
{
int StringtoInt(std::string str)
{
int multiplier = 1;
int sum = 0;
for(int i = str.size() - 1;i >= 0; i--)
{
switch(str[i])
{
case '0':
sum += 0;
break;
case '1':
sum += 1 * multiplier;
break;
case '2':
sum += 2 * multiplier;
break;
case '3':
sum += 3 * multiplier;
break;
case '4':
sum += 4 * multiplier;
break;
case '5':
sum += 5 * multiplier;
break;
case '6':
sum += 6 * multiplier;
break;
case '7':
sum += 7 * multiplier;
break;
case '8':
sum += 8 * multiplier;
break;
case '9':
sum += 9 * multiplier;
break;
case '-':
sum *= -1;
break;
case ' ':
continue;
case
}
multiplier *= 10;
}
return sum;
}
}
int main()
{
//just an example of how to use the function
int a = dstd::StringtoInt("1992");
std::cout<<a<<'\n';
}Copyright © 2021 Codeinu
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