Pre-Increment : y = ++ivar  Steps :

1. Value of ivar is incremented 
2. Then value of ivar is assigned to y

In Short :

• When Prefix (++/--) is used with a variable in an Expression .
• The variable is incremented/decremented by one  then  Expression is evaluated using the original value of variable
• Here a is incremented /decremented before use

Live Example :

#include<stdio.h>
void main()
{
int a,b,x=10,y=10;
a = x++;
b = ++y;                    // Pre-Incremented
printf("Value of a : %d",a);
printf("Value of b : %d",b);
}

Output :

Value of a : 10
Value of b : 11

Why Output is 11 in case of Pre-increment : 

1. Pre (before) , Value of y is first incremented i.e y = 11
2. Then y is assigned to b

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Tags / Keywords : | Post-Decrement, Post-Increment, Pre-Decrement, Pre-Increment

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