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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
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(){
int value;
char string1[] = "3567";
value = atoi(string1);
printf("String value = %s
", string1);
printf("Integer value = %d
", value);
char string2[] = "TutorialsPoint";
value = atoi(string2);
printf("String value = %s
", string2);
printf("Integer value = %d
", value);
return (0);
}Output
String value = 3567 Integer value = 3567 String value = TutorialsPoint Integer value = 0
Updated on: 09-Mar-2021
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