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Increment & Decrement Operators in Operators of Programming in C
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Increment & Decrement Operators 
Increment and decrement operators are used to increase or decrease the variable value by 1. It is doing postincrement or preincrement. postincrement is assigning the value to the variable then increasing(a = b++;). Preincrement is increasing the value before assign the value to the left hand side variable(a = ++b;).
Operators and meaning 
Operators Name Meanings Example
a++ Post increment Increase the value after assign to the variable. b = a++;
++a pre increment Increase the value before assign to the variable. b = ++a;
a-- Post decrement Decrease the value after assign to the variable. b = a--;
--a pre decrement Decrease the value before assign to the variable. b = --a;
Program
#include
void main(){
   int a,b,c;
   a = 30;b = 20;
   c = a++;
   printf("C = %d\n",c);
   c = ++b;
   printf("C = %d\n",c);
}
Output 
C = 30
C = 21
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