Syntax to convert string formatted value to an integer:
integer_variable = Convert.ToInt32(Console.ReadLine());
Program:
/*C# program to input and print an integer number*/
using System;
class ReadIntExample {
static void Main() {
//declare an integer variable
int num = 0;
//prompt message to take input
Console.Write("Input an integer value: ");
num = Convert.ToInt32(Console.ReadLine());
//print the value
Console.WriteLine("num = " + num);
}
}
Output
Input an integer value: 200
num = 200
Program:
using System;
class ReadIntExample {
static void Main() {
try{
//declare an integer variable
int num = 0;
//prompt message to take input
Console.Write("Input an integer value: ");
num = Convert.ToInt32(Console.ReadLine());
//print the value
Console.WriteLine("num = " + num);
}
catch(Exception ex){
Console.WriteLine("Error: " + ex.ToString());
}
}
}
Output (when the input value is an integer)
Input an integer value: 200
num = 200
Output (when input value is a string)
Input an integer value: Hello
Error: System.FormatException: Input string was not in the correct format
at System.Int32.Parse (System.String s) [0x00000] in
<filename unknown>:0
at System.Convert.ToInt32 (System.String value) [0x00000]
in <filename unknown>:0
at ReadIntExample.Main () [0x00000]
in <filename unknown>:0