How to create a customized atoi() function in C language?

The atoi() is predefined function used to convert a numeric string to its integer value.

Create a customized atoi()

The atoi() only converts a numeric string to integer value, so we need to check the validity of the string.

If this function encounters any non-numeric character in the given string, the conversion from string to integer will be stopped.

Example

 Live Demo

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(){
   int value;
   char string1[] = "3567";
   value = atoi(string1);
   printf("String value = %s\n", string1);
   printf("Integer value = %d\n", value);
   char string2[] = "TutorialsPoint";
   value = atoi(string2);
   printf("String value = %s\n", string2);
   printf("Integer value = %d\n", value);
   return (0);
}

Output

String value = 3567
Integer value = 3567
String value = TutorialsPoint
Integer value = 0

Bhanu Priya

Updated on 09-Mar-2021 09:31:03

• Related Questions & Answers
• String to Integer (atoi) in C++
• Create a DataFrame with customized index parameters in Pandas
• Write your own atoi() in C++
• Recursive Implementation of atoi() in C++
• How to create a pointer for strings using C language?
• isalnum() function in C Language
• isupper() function in C Language
• What is a malloc function in C language?
• Enum with Customized Value in C#
• How to use Pre-defined mathematical function in C language?
• Explain Squeeze Function C language
• fgetc() function in C Programming Language
• Explain feof() function in C language with a program
• How to pass entire array as an argument to a function in C language?
• Program with calling function in c language