How do you write a c program to accept 20 characters and display whether each input given is a digit a lower case or upper case using only arrays and while loops and for loops?

Answer 1

#include<stdio.h>

bool is_digit (char c) {

return (c>='0' && c<='9');

}

bool is_upper (char c) {

return (c>='A' && c<='Z');

}

bool is_lower (char c) {

return (c>='a' && c<='z');

}

int main () {

char input[20];

printf ("Enter a 20 character string containing digits and letters: ");

scanf ("%s", &input); /* beware of buffer overflow */

for (int index=0; index<20; ++index) {

printf ("The character at index %d is ");

if (is_digit (input[index]))

printf ("a digit.\n");

else if (is_upper (input[index]))

printf ("an uppercase letter.\n");

else if (is_lower (input[index])) printf ("a lowercase letter.\n");

else

printf ("a non-alphanumeric character.\n");

}

return 0;

}