atoi is a function in the C programming language that converts a string into an integer numerical representation. atoi stands for ASCII to integer. It is included in the C standard library header file stdlib.h. Its prototype is as follows:

atoi : ASCII to integer 


    //INPUT : 24 83 0 2 


    //OUTPUT : 24 83 0 2

#include<stdio.h>

#include<string.h>
int atoi(int K[10],char string[30])
{
    int j=0,i=0,temp=0;
    while(string[i]!='\0')
    {
        temp=0;
        while(string[i]!=' ' && string[i]!='\0')
            temp=temp*10 + (string[i++]-'0') ;
        if(string[i]==' ')
            i++;
        K[j++]=temp;
    }
return j;
}

int main()
{
    char string[30];
    int i,a,A[10];
    printf("\nEnter String : ");
    gets(string);
    a=atoi(A,string);
    printf("\nIntegers are : ");
    for(i=0;i<a;i++)
        printf("%d ",A[i]);
    printf("\n");
return 0;
}