Please Explain Comma Operator in this Program

Question

Please explain me the output of this program:

int main()
{    
    int a,b,c,d;  
    a=10;  
    b=20;  
    c=a,b;  
    d=(a,b);  
    printf(\"\\nC= %d\"         


        

Answer 1

The comma operator evaluates all its operands, then yields the value of the last expression.