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 In the C programming language, placeholders and control characters are used to format and control the output of text in console-based programs. They are special characters or sequences of characters that have specific meanings. Here are the placeholders and control characters commonly used in C: 1. Placeholders:    - %d: Used to display signed integers.      Example: printf("The value is %d", 10);    - %u: Used to display unsigned integers.      Example: printf("The value is %u", 10);    - %f: Used to display floating-point numbers.      Example: printf("The value is %f", 3.14);    - %c: Used to display characters.      Example: printf("The character is %c", 'A');    - %s: Used to display strings (sequence of characters).      Example: printf("The string is %s", "Hello");    - %p: Used to display memory addresses (pointers)...