#include<iostream>

#include<string>

using namespace std;

int atoi(char *s);

void main()

{

char *str;

cout<<"insert String: "<<endl;

cin>>*str;

cout<<"Integer= "<<atoi(str);

}

int atoi(char *s)

{

int i, n,sign;

for(i=0; s[i]==' '||s[i]=='\n'||s[i]=='\t'; i++)

sign=1;

if(s[i]=='+'||s[i]=='-')

sign=(s[i++]=='+')?1:-1;

for(n=0; s[i]>='0'&& s[i]<= '9'; i++)

n=10*n+s[i]-'0';

return (sign * n);

}