What this. (%d) means in c ?

Answer 1

%d is used in functions like printf and scanf to denote base 10 (decimal) intger input/output.

Answer 2

%d refers to an integer (or decimal) for example %s refers to a string. %c refers to a char. %d is used to print some number to standard output:

https://code.sololearn.com/c63jW27320s0/?ref=app

Hope this helps! 😁