What is the method to input a 99-digit integer using scanf in the C programming language?

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The scanf function in C has a limitation of only reading integers with a limited number of digits, typically not more than 10-12 digits. However, to input a 99-digit integer, you can use a character array as a buffer to store the number as a string and then convert it to a long long integer using the strtoull function.

Here is an example code snippet to input 99-digit integer using scanf:

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

int main() {
    char num[100]; // buffer to store the 99-digit integer
    printf("Enter a 99-digit integer: ");
    scanf("%s", num); // read the input as string
    long long int n = strtoull(num, NULL, 10); // convert the string to integer
    printf("The integer you entered is: %lld\n", n);
    return 0;
}

Note that this method has limitations in terms of the size of the integer that can be inputted due to memory constraints. Also, this method is not suitable for inputting negative integers, as it does not handle the negative sign.