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void main()
{
char *str, c;
int i = 0, j = 1;
str = (char*)malloc(sizeof(char));
printf("Enter String : ");
while (c != '\n') {
// read the input from keyboard standard input
c = getc(stdin);
// re-allocate (resize) memory for character read to be stored
str = (char*)realloc(str, j * sizeof(char));
// store read character by making pointer point to c
str[i] = c;
i++;
j++;
}
str[i] = '\0'; // at the end append null character to mark end of string
printf("\nThe entered string is : %s", str);
free(str); // important step the pointer declared must be made free
}