a--  Arithmetic Operators in C, post-decrement operator decreases the integer value by one.

C Programming Language Operators and Enums in C Language (Article) Operators and Enums in C Language (Program)

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Program:

#include"stdio.h"
void main()
{
   int a = 23;
   a--;
   printf(" Value of c is %d\n", a );
}

Output:

 Value of c is 22
Press any key to continue . . .

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