C++ Program to Convert Lowercase to Uppercase

To write a program to convert lowercase to uppercase or to convert uppercase to lowercase, we need to use the ASCII values of the letters. This can be an amazing beginner level project as a C++ programmer. If you want to know how to convert lowercase letters to uppercase or vice versa using C++, this article is for you. In this article, I will introduce you to a tutorial on how to write a C++ program to convert lowercase to uppercase of a letter and vice versa.

C++ Program to Convert Lowercase to Uppercase

To understand the logic behind converting a lowercase letter to uppercase or vice versa, you need to understand the full ASCII table. It stands for American Standard Code for Information Interchange. It is nothing more than a character encoding standard for electronic communications. Below is the full ASCII table that will help you understand the logic behind writing a program to convert lowercase to uppercase or vice versa.

Letter	ASCII Code	Binary	Letter	ASCII Code	Binary
a	97	1100001	A	65	1000001
b	98	1100010	B	66	1000010
c	99	1100011	C	67	1000011
d	100	1100100	D	68	1000100
e	101	1100101	E	69	1000101
f	102	1100110	F	70	1000110
g	103	1100111	G	71	1000111
h	104	1101000	H	72	1001000
i	105	1101001	I	73	1001001
j	106	1101010	J	74	1001010
k	107	1101011	K	75	1001011
l	108	1101100	L	76	1001100
m	109	1101101	M	77	1001101
n	110	1101110	N	78	1001110
o	111	1101111	O	79	1001111
p	112	1110000	P	80	1010000
q	113	1110001	Q	81	1010001
r	114	1110010	R	82	1010010
s	115	1110011	S	83	1010011
t	116	1110100	T	84	1010100
u	117	1110101	U	85	1010101
v	118	1110110	V	86	1010110
w	119	1110111	W	87	1010111
x	120	1111000	X	88	1011000
y	121	1111001	Y	89	1011001
z	122	1111010	Z	90	1011010

I hope you have understood the ASCII table shown above. The only things that you should take away from the above table for writing this program are:

65 to 90 = A to Z
97 to 122 = a to z

Now below is how you can write a C++ program to convert a letter with lowercase to uppercase or vice versa:

Summary

So this is how you can write a program for converting the lowercase of a letter to uppercase or vice versa by using the C++ programming language. This can be an amazing beginner level project as a C++ programmer. I hope you liked this article on how to write a C++ program to convert lowercase to uppercase or vice versa using C++. Feel free to ask your valuable questions in the comments section below.