What does %d mean in the C programming language?

The format specifier '%d' is used in the 'printf()' and'scanf()' functions of the C computer language to represent an integer number.

'%d' is used to format and print the value of an integer variable or expression when used with 'printf()'. For instance:

int num = 10;

printf("The value of num is: %d\n", num);

The value of the 'num' variable is denoted in the code above by the placeholder '%d'. During the execution of "printf()," the real value of "num" will be replaced with "%d," producing the output "The value of num is: 10."

In a same manner, '%d' is used in conjunction with'scanf()' to read an integer value from the input. For instance:

int num;

scanf("%d", &num);

The '%d' operator in this code snippet instructs the function'scanf()' to read an integer value from the user input and store it in the variable 'num'.

It's important to note that C offers a variety of format specifiers, with '%d' being only one of them. '%f' for floating-point numbers, '%c' for characters, '%s' for strings, and '%x' for hexadecimal integers are some other format specifiers that are frequently used. Each format specifier has its own formatting and value-reading guidelines and is used to handle a particular kind of data.