http://www.stroustrup.com/new_learning.pdf

c_alternative.c

//
// Created by Cengiz Can on 01/07/15.
//

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>

void quit() {
    perror("memory exhausted\n");
    exit(1);
}

int main() {
    size_t max = 20;

    char *name = (char *) malloc(max);

    if (name == 0) {
        quit();
    }

    printf("Enter stuff:\n");

    while (1) {
        int c = getchar();

        if (c == EOF)
            break;

        if (!isspace(c)) {
            ungetc(c, stdin);
            break;
        }
    }

    int i = 0;

    while (1) {
        int c = getchar();

        if (c == '\n' || c == EOF) {
            name[i] = 0;
            break;
        }

        name[i] = (char) c;

        if (i == max - 1) {
            max = max + max;
            name = (char *) realloc(name, max);
            if (name == 0) quit();
        }

        i++;
    }

    printf("Hello %s\n", name);

    free(name);

    return 0;
}