/=   Assignment Operators in C, Modulus AND assignment operator. It takes modulus using two operands and assigns the result to the left operand.

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

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Program:

//Assignment operator 

#include"stdio.h"
void main() {

   int a = 2;
   int c = 12 ;
   c %=  a; // c=c%a c=12%2=0  
   printf(" %=  Operator Example\n Value of c = %d \n", c );
   c = 11 ;
   c %=  a; // c=c%a c=11%2=1 
   printf(" %=  Operator Example\n Value of c = %d \n", c );
}

Output:

 /=  Operator Example
 Value of c = 0
 =  Operator Example
 Value of c = 1
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