Assembly Program to Count Vowels in a String

The program will prompt the user to input a string and will count the number of vowels present in that string.

The program takes a string and stores the string in STRING and will start iteration if there is a consonant the program will continue without incrementing VOWELS and if there is a VOWEL the program will increment VOWELS. After counting the vowels the program simply prints the number of vowels.

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.MODEL SMALL .STACK 100H .DATA STRING DB 100 DUP(?) MSG1 DB "ENTER A STRING: $" MSG2 DB 0DH, 0AH, "NO. OF VOWELS_FOUNDS: $" VOWELS DW 0 .CODE MAIN PROC MOV AX, @DATA MOV DS, AX MOV ES, AX MOV AH, 9 LEA DX, MSG1 INT 21H LEA DI, STRING MOV AH, 1 READ: INT 21H CMP AL, 0DH JE ENDOFSTRING STOSB JMP READ ENDOFSTRING: MOV AL, "$" STOSB XOR BX, BX COUNT: MOV AL, STRING[BX] CMP AL, "$" JE EXIT CMP AL, "a" JE VOWEL_FOUND CMP AL, "e" JE VOWEL_FOUND CMP AL, "i" JE VOWEL_FOUND CMP AL, "o" JE VOWEL_FOUND CMP AL, "u" JE VOWEL_FOUND CMP AL, "A" JE VOWEL_FOUND CMP AL, "E" JE VOWEL_FOUND CMP AL, "I" JE VOWEL_FOUND CMP AL, "O" JE VOWEL_FOUND CMP AL, "U" JE VOWEL_FOUND INC BX JMP COUNT VOWEL_FOUND: MOV CX, VOWELS INC CX MOV VOWELS, CX INC BX JMP COUNT EXIT: MOV AH, 9 LEA DX, MSG2 INT 21H MOV AH, 2 MOV DX, VOWELS ADD DX, 30H INT 21H MAIN ENDP END MAIN

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