#include <stdio.h>
#include <stdlib.h>
#include <string.h>
main() {
    char * str;
    str = (char*)malloc(51 * sizeof(char));  /* (not forgetting the nul) */
    if (str == NULL) {
        fprintf(stderr, "ERROR: no space left.\n");
        exit(EXIT_FAILURE);
    }
    printf("Allocation succeeded!\n");
    strcpy(str, "Up to 50 characters");  /* Use str like any char array */
    return 0;
}