C Program - Display Characters from A to Z Using For Loop

This C code block is a program that prints the ASCII codes and corresponding characters for uppercase and lowercase alphabets.

#include <stdio.h>

int main()
{

    char char_atm;

    printf("----------- \n");
    printf("Uppercase:  \n");
    printf("----------- \n");

    for (char_atm = 'A'; char_atm <= 'Z'; char_atm++)
    {
        printf("%d <--> %c \n", char_atm, char_atm);
    }

    printf("----------- \n");
    printf("Loweracse:  \n");
    printf("----------- \n");

    for (char_atm = 'a'; char_atm <= 'z'; char_atm++)
    {
        printf("%d <--> %c \n", char_atm, char_atm);
    }

    return 0;
}

Result: 

-----------
Uppercase:
-----------
65 <--> A
66 <--> B
67 <--> C
68 <--> D
69 <--> E
70 <--> F
71 <--> G
72 <--> H
73 <--> I
74 <--> J
75 <--> K
76 <--> L
77 <--> M
78 <--> N
79 <--> O
80 <--> P
81 <--> Q
82 <--> R
83 <--> S
84 <--> T
85 <--> U
86 <--> V
87 <--> W
88 <--> X
89 <--> Y
90 <--> Z
-----------
Loweracse:
-----------
97 <--> a
98 <--> b
99 <--> c
100 <--> d
101 <--> e
102 <--> f
103 <--> g
104 <--> h
105 <--> i
106 <--> j
107 <--> k
108 <--> l
109 <--> m
110 <--> n
111 <--> o
112 <--> p
113 <--> q
114 <--> r
115 <--> s
116 <--> t
117 <--> u
118 <--> v
119 <--> w
120 <--> x
121 <--> y
122 <--> z

Process returned 0 (0x0)   execution time : 0.109 s
Press any key to continue.

Let's go through it line by line: 

#include <stdio.h>

This line includes the standard input/output header file. 

int main()
{

This line defines the main function of the program. 

    char char_atm;

This line declares a character variable char_atm which will be used to store the alphabets. 

    printf("----------- \n");
    printf("Uppercase:  \n");
    printf("----------- \n");

These lines print a header indicating the following output will show the ASCII codes and corresponding characters for uppercase alphabets. 

    for (char_atm = 'A'; char_atm <= 'Z'; char_atm++)
    {
        printf("%d <--> %c \n", char_atm, char_atm);
    }

This for loop iterates through each uppercase alphabet from 'A' to 'Z', and for each alphabet, it prints the corresponding ASCII code and character using the printf() function. %d represents the ASCII code and %c represents the corresponding character. 

    printf("----------- \n");
    printf("Loweracse:  \n");
    printf("----------- \n");

These lines print a header indicating the following output will show the ASCII codes and corresponding characters for lowercase alphabets. 

    for (char_atm = 'a'; char_atm <= 'z'; char_atm++)
    {
        printf("%d <--> %c \n", char_atm, char_atm);
    }

This for loop iterates through each lowercase alphabet from 'a' to 'z', and for each alphabet, it prints the corresponding ASCII code and character using the printf() function. %d represents the ASCII code and %c represents the corresponding character. 

    return 0;
}

This line indicates the end of the main() function and returns 0, indicating that the program has executed successfully.