String to Integer in Different Programming Languages
Last Updated :
24 Aug, 2024
Improve
Below are example programs to do string to integer conversion in different programming languages.
#include <bits/stdc++.h>
using namespace std;
int main()
{
int val;
char strn1[] = "12546";
val = atoi(strn1);
cout << "String value = " << strn1 << endl;
cout << "Integer value = " << val << endl;
char strn2[] = "GeeksforGeeks";
val = atoi(strn2);
cout << "String value = " << strn2 << endl;
cout << "Integer value = " << val << endl;
return (0);
}
// This code is contributed by shivanisinghss2110
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
int val;
char strn1[] = "12546";
val = atoi(strn1);
printf("String value = %s\n", strn1);
printf("Integer value = %d\n", val);
char strn2[] = "GeeksforGeeks";
val = atoi(strn2);
printf("String value = %s\n", strn2);
printf("Integer value = %d\n", val);
return (0);
}
import java.util.*;
public class Main {
public static void main(String[] args)
{
int val;
String strn1 = "12546";
val = Integer.parseInt(strn1);
System.out.println("String value = " + strn1);
System.out.println("Integer value = " + val);
String strn2 = "GeeksforGeeks";
try {
val = Integer.parseInt(strn2);
System.out.println("String value = " + strn2);
System.out.println("Integer value = " + val);
}
catch (NumberFormatException e) {
val = 0;
System.out.println("String value = " + strn2);
System.out.println("Integer value = " + val);
}
}
}
def main():
strn1 = "12546"
val = int(strn1)
print("String value = ", strn1)
print("Integer value = ", val)
strn2 = "GeeksforGeeks"
try:
val = int(strn2)
except ValueError:
val = 0
print("String value = ", strn2)
print("Integer value = ", val)
if __name__ == "__main__":
main()
using System;
namespace GeeksforGeeks {
class Program {
static void Main(string[] args)
{
String strn1 = "12546";
int val = int.Parse(strn1);
Console.WriteLine("String value = " + strn1);
Console.WriteLine("Integer value = " + val);
String strn2 = "GeeksforGeeks";
try {
val = int.Parse(strn2);
}
catch (FormatException e) {
val = 0;
Console.WriteLine("String value = " + strn2);
Console.WriteLine("Integer value = " + val);
}
}
}
}
// Javascript code to convert string to integer
let val;
let strn1 = "12546";
val = parseInt(strn1);
console.log("String value = " + strn1);
console.log("Integer value = " + val);
let strn2 = "GeeksforGeeks";
val = parseInt(strn2);
console.log("String value = " + strn2);
console.log("Integer value = " + val);
// This code is contributed by prasad264
Output
String value = 12546 Integer value = 12546 String value = GeeksforGeeks Integer value = 0
Complexity Analysis of Standard Functions
Below is a typical time complexity analysis of the library functions
- Time Complexity: O(n), Only one traversal of the string is needed.
- Space Complexity: O(1), As no extra space is required.
Detailed Articles for Different Languages:
Below are detailed articles in different programming languages to do string to integer conversion.
String to Integer in C/C++
String to Integer in Java
String to Integer in JavaScript
String to Integer in Python
String to Integer in C#
String to Integer in PHP
How to implement your own conversion?
We need to write a function that takes a string as an argument and returns its equivalent integer value. Please refer the below post for details.
Write your own string to integer converter.
