C Program to Demonstrate use of atoi Function

/*

C program: atoi function use

Description: atoi function convert string to integer representation of integral numbers.



Example 1: string "02302"    converts to number 2302

Example 2: string "abcd"     returns 0

Example 3: string "-0234"    converts to number -234

Example 4: string "0023ABCD" converts to number 23

Example 5: string "12abc45g" converts to number 12

Example 6: string "--0123"   returns 0

Example 7: string "" (NULL)  returns 0

Example 8: string "   234a"  converts to number 234

Example 9: string "+  239b"  returns 0

Example10: string "+239"     converts to number 239

Example11: string "   +12"   converts to number 12

Example12: string "   -12"   converts to number -12



Compiler: Turbo C++ 3.0

Author: Mangilal Sharma

Date: September 12, 2015

Program for: world-of-c-programming.blogpost.com

Program number: 101

*/



#include<stdio.h> //for printf and gets

#include<conio.h> //for clrscr and getch

#include<stdlib.h> //for atoi

#include<string.h> //for strcpy



void main()

{

 char string[] = "02302";

 clrscr();

 printf("String value = %s, Int value = %d\n",string,atoi(string));

 strcpy(string,"C Program");

 printf("String value = %s, Int value = %d\n",string,atoi(string));



 printf("Press y for try your strings to atoi function.\n");

 printf("Press any other key to exit.\n");

 while(getch() == 'y')

 {

  printf("Enter String and press enter:");

  gets(string);

  printf("String value = %s, Int value = %d\n",string,atoi(string));

 }

}