what is % in c code example

Example 1: %e in c programming

follow this for best answer 
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https://www.freecodecamp.org/news/format-specifiers-in-c/

Example 2: how to use ? in c

result = comparison ? if_true : if_false;

Example 3: %= in c

Modulus AND assignment operator. It takes modulus using two operands and assigns the result to the left operand.