%d in c

%d is a format specifier in the C programming language that is used to print or scan an integer value. It is part of the printf() and scanf() functions in C. When using printf(), %d is used to display the value of an integer variable. When using scanf(), %d is used to read an integer value from the user.

Example using printf():

int num = 10;
printf("The value of num is %d\n", num);

Output:

The value of num is 10

Example using scanf():

int num;
printf("Enter a number: ");
scanf("%d", &num);
printf("You entered: %d\n", num);

Output:

Enter a number: 5
You entered: 5

In both examples, %d is used as a placeholder for the integer value. It tells the printf() and scanf() functions where to insert or read the integer value. The & operator is used with scanf() to get the address of the variable where the integer value should be stored.