In the C programming language, the format specifier for integers is %d when using the printf or scanf function. The %d is called the conversion specifier, and it tells the function to expect an integer value. For example, the following code would print the value of the integer variable x:

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int x = 5; printf("The value of x is %d", x);

This will output:

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The value of x is 5

In addition to %d, there are also other format specifiers for integers such as %i, %u for unsigned integer, %x for Hexadecimal, %o for octal representation of integer.

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printf("The value of x in hexadecimal is %x", x);

This will output:

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The value of x in hexadecimal is 5