Write a C Program to Check Whether it is Alphabet or Number

In this tutorial learn how you can write a c program to enter a character from keyboard and check whether it is alphabet or number. If character is an lowercase alphabet convert it to uppercase and vice versa. The program should use unformatted I/O functions.

C programming is a powerful general-purpose programming language. It can be used to develop software like operating systems, databases, compilers, etc.

Write a Program to Check Whether it is Alphabet or Number

Here is the code to enter a character from keyboard and check whether it is alphabet or number. If character is an lowercase alphabet convert it to uppercase and vice versa. The program should use unformatted I/O functions. in C programming.

#include <stdio.h> //WAP to enter a character from keyboard and check whether it is alphabet or number. If character is an lowercase alphabet convert it to uppercase and vice versa. The program should use unformatted I/O functions.
#include <ctype.h>
int main()
{
    char word;
    puts("Please enter any character:");
    word = getchar();
    if (isalpha(word))
    {
        if (isupper(word) == 1)
            putchar(tolower(word));
        else
            putchar(toupper(word));
    }
    else
    {
        putchar(word);
        puts(" is number.");
    }
    return 0;
}

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Conclusion

This is how you can enter a character from keyboard and check whether it is alphabet or number. If character is an lowercase alphabet convert it to uppercase and vice versa. The program should use unformatted I/O functions in c programming. Comment below if you like our tutorial.