Answer / Abhinav Awasthi

Here's an example of a simple C program that checks if a number is an Armstrong number. Note that this program assumes the input number to be a positive integer less than 1000 for efficiency.n```n#include <stdio.h>nvoid armstrong(int n){ // function to check armstrong numbertint i, sum = 0, temp = n;n while (temp > 0){ntsum += (temp % 10) * (temp % 10) * (temp % 10);ntemp /= 10;n}n if (sum == n) printf("%d is an Armstrong number.", n);n else printf("%d is not an Armstrong number.", n);n}nint main(){n int num; /* input number */nprintf("Enter a positive integer less than 1000: ");nscanf("%d", &num);narmstrong(num);nreturn 0;n}n```

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