How to retrieve values in printf function in C language?

In C language, the printf function is used to output various types of data to the standard output device (usually the screen). The basic syntax of the printf function is as follows:

int printf(const char *format, ...);

“Among them, ‘format’ is a format string used to specify the output format, with ellipsis indicating that it can accept multiple parameters, which will be output according to the format specified in the ‘format’ string.”

For example, if you want to output an integer variable num, you can use the %d placeholder to specify the output format and then pass num as a parameter to the printf function.

int num = 42;
printf("The number is: %d\n", num);

This will output “The number is: 42”. In addition to %d for integers, there are other formatting placeholders, such as %f for floating point numbers, %c for characters, %s for strings, and so on. For more detailed formatting placeholders, you can refer to the documentation or tutorials of the C language.