Write your own C program to implement the atoi() function

The prototype of the atoi() function is ...


int atoi(const char *string);



Here is a C program which explains a different way of coding the atoi() function in the C language.


#include

int myatoi(const char *string);

int main(int argc, char* argv[])
{
printf("\n%d\n", myatoi("1998"));
getch();
return(0);
}

int myatoi(const char *string)
{
int i;
i=0;
while(*string)
{
i=(i<<3) + (i<<1) + (*string - '0');
string++;

// Dont increment i!

}
return(i);
}


Try working it out with a small string like "1998", you will find out it does work!.