Lesson 11: C Programming, introduction to CHAR data type

This C program first includes the standard input/output library, stdio.h, which provides functions for reading and writing data. It then defines a main() function, which is the entry point of the program. Inside the main() function, it declares a variable named letter of type char. This variable can hold a single character or a small integer value.

Next, the program assigns the character literal 'A' to the letter variable using single quotes to indicate a character literal. It uses the printf() function to print out the value of letter twice, first as a character (%c), and then as an integer (%d). The printed values are enclosed in quotes and preceded by %c= and %d=, respectively. The first printf() statement outputs the character 'A' followed by its corresponding integer value, which is usually 65 in ASCII encoding.

Then, the program assigns the integer value 66 to the letter variable directly. It uses printf() again to print out the value of letter twice, first as a character (%c), and then as an integer (%d). The second printf() statement outputs the character 'B' followed by its corresponding integer value, which is usually 66 in ASCII encoding.

Finally, the program terminates. Overall, this program demonstrates how to declare and use the char data type in C to represent characters and small integers. It also shows how to output the value of a char variable using printf() with the appropriate format specifiers.

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