Decrement operator

There are two types of Decrement Operator:
(1) Postfix decrement operator
(2) Prefix decrement operator

Postfix Decrement operator(--)

It is use to decrement value of variable one by one.

Syntax

variableName--

Program

#include <stdio.h> 
#include <conio.h> 
void main(){ 
 int a; 
 int b; 
 clrscr(); 
 printf("Enter value of a: "); 
 scanf("%d",&a); 
 b = a--;
 printf("\n value of b = %d",b);
 printf("\n value of a = %d",a);
 getch();
}

See Output

In above program you have read b = a--;.In this statement value of a first assign to b then decrement a.

Program

#include <stdio.h> 
#include <conio.h> 
void main(){
 int a; 
 int b; 
 int c; 
 clrscr();
 printf("Enter value of a: ");
 scanf("%d",&a);
 printf("\n Enter value of b: ");
 scanf("%d",&b); 
 c = a-- + b--; 
 printf("\n value of a = %d",a); 
 printf("\n value of b = %d",b);
 printf("\n value of c = %d",c); 
 getch(); 
}

See Output

In above program you have read c = a-- + b--;.In this statement value of a and value of b first add then result assign to c after assignment value of a and value of b will be decrement.

Program

#include <stdio.h> 
#include <conio.h> 
void main(){ 
 int a;
 clrscr();
 printf("Enter value of a: ");
 scanf("%d",&a);
 printf("\n value of a = %d",a--);
 printf("\n after decrement value of a : %d",a);
 getch();
}

See Output

In above program you have read printf("value of a = %d",a--);. In this statement first value of a will be display on output screen then value of a will be decrement.

prefix decrement operator(--)

It is also used to decrement value of variable one by one.

Syntax

--variableName;

Program

#include <stdio.h> 
#include <conio.h> 
void main(){ 
 int a; 
 int b;
 clrscr();
 printf("Enter value of a: ");
 scanf("%d",&a);
 b = --a;
 printf("\n value of b = %d",b);
 printf("\n value of a = %d",a);
 getch();
}

See Output

In above program you have read b = --a;. In this statement value of a first decrement then assign to b.

Program

#include <stdio.h> 
#include <conio.h> 

void main(){
 int a;
 int b; 
 int c;  
 clrscr(); 
 printf("Enter value of a: "); 
 scanf("%d",&a); 
 printf("\n Enter value of b: "); 
 scanf("%d",&b);
 c = --a + --b; 
 printf("\n value of a = %d",a); 
 printf("\n value of b = %d",b); 
 printf("\n value of c = %d",c); 
 getch(); 
}

See Output

In above program you have read c = --a + --b;.In this statement value of a and value of b first decrement then add. After addition result will be assign to c.

Program

#include <stdio.h> 
#include <conio.h> 
void main(){ 
 int a; 
 clrscr(); 
 printf("Enter value of a: "); 
 scanf("%d",&a); 
 printf("\n value of a = %d",--a); 
 printf("\n after decrement value of a : %d",a); 
 getch();  
}

See Output

In above program you have read printf("value of a = %d",--a);. In this statement first value of a will be decrement then display on output screen.

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