#include <stdio.h>

#ifndef NULL
#define NULL (void *) 0
#endif

#define LINE_LEN 64

int atoigt(char line[]) {
    int val = 0;
    int ptr = 0;
    while (line[ptr] >= '0' && line[ptr] <='9' && line[ptr]!='\0') {
        val = val * 10 + (line[ptr] - '0');
        ptr++;
    }
    return val;
}

int main(int argc, char const *argv[])
{
    char line[LINE_LEN];
    printf("Enter an integer: ");
    while (NULL != fgets(line, LINE_LEN, stdin))
    {
        printf("The original string:<%s>  Print the string as in int:<%d>  the integer:%d\n", line, line, atoigt(line));
        printf("\nEnter an integer: ");
    }
    return 0;
}