C program to check whether the given letter is small letter or capital letter.

Program code

#include <stdio.h>

#include <conio.h>

void main()

{

char letter;

clrscr();

printf("Please input an alphabet.\n");

scanf("%c",&letter);

switch(letter)

{

case 'a':printf("You have typed small letter.\n");

break;

case 'b':printf("You have typed small letter.\n");

break;

case 'c':printf("You have typed small letter.\n");

break;

case 'd':printf("You have typed small letter.\n");

break;

case 'e':printf("You have typed small letter.\n");

break;

case 'f':printf("You have typed small letter.\n");

break;

case 'g':printf("You have typed small letter.\n");

break;

case 'h':printf("You have typed small letter.\n");

break;

case 'i':printf("You have typed small letter.\n");

break;

case 'j':printf("You have typed small letter.\n");

break;

case 'k':printf("You have typed small letter.\n");

break;

case 'l':printf("You have typed small letter.\n");

break;

case 'm':printf("You have typed small letter.\n");

break;

case 'n':printf("You have typed small letter.\n");

break;

case 'o':printf("You have typed small letter.\n");

break;

case 'p':printf("You have typed small letter.\n");

break;

case 'q':printf("You have typed small letter.\n");

break;

case 'r':printf("You have typed small letter.\n");

break;

case 's':printf("You have typed small letter.\n");

break;

case 't':printf("You have typed small letter.\n");

break;

case 'u':printf("You have typed small letter.\n");

break;

case 'v':printf("You have typed small letter.\n");

break;

case 'w':printf("You have typed small letter.\n");

break;

case 'x':printf("You have typed small letter.\n");

break;

case 'y':printf("You have typed small letter.\n");

break;

case 'z':printf("You have typed small letter.\n");

break;

case 'A':printf("You have typed capital letter.\n");

break;

case 'B':printf("You have typed capital letter.\n");

break;

case 'C':printf("You have typed capital letter.\n");

break;

case 'D':printf("You have typed capital letter.\n");

break;

case 'E':printf("You have typed capital letter.\n");

break;

case 'F':printf("You have typed capital letter.\n");

break;

case 'G':printf("You have typed capital letter.\n");

break;

case 'H':printf("You have typed capital letter.\n");

break;

case 'I':printf("You have typed capital letter.\n");

break;

case 'J':printf("You have typed capital letter.\n");

break;

case 'K':printf("You have typed capital letter.\n");

break;

case 'L':printf("You have typed capital letter.\n");

break;

case 'M':printf("You have typed capital letter.\n");

break;

case 'N':printf("You have typed capital letter.\n");

break;

case 'O':printf("You have typed capital letter.\n");

break;

case 'P':printf("You have typed capital letter.\n");

break;

case 'Q':printf("You have typed capital letter.\n");

break;

case 'R':printf("You have typed capital letter.\n");

break;

case 'S':printf("You have typed capital letter.\n");

break;

case 'T':printf("You have typed capital letter.\n");

break;

case 'U':printf("You have typed capital letter.\n");

break;

case 'V':printf("You have typed capital letter.\n");

break;

case 'W':printf("You have typed capital letter.\n");

break;

case 'X':printf("You have typed capital letter.\n");

break;

case 'Y':printf("You have typed capital letter.\n");

break;

case 'Z':printf("You have typed capital letter.\n");

break;

default:printf("Invalid alphabet.\n");

break;

}

getch();

}

Example of output

Please input an alphabet.

a

You have typed small letter.