Q.Write a C program to illustrate the use of decrement operator.

#include<stdio.h>  
void main()  
{  
    int a=7, b=5;  
    printf("a=%d\h",--a);  
    printf("b=%d\h",b--);  
}  

The decrement operator -- subtracts one from a variable; pre-decrement (--a) subtracts first and then uses the new value, while post-decrement (b--) uses the current value first and then subtracts. …

[!TLDR]

Pre-decrement (--a) yields the value after subtracting one, so it prints 6; post-decrement (b--) yields the value before subtracting, so it prints 5.

The decrement operator -- reduces an integer by one and, like ++, behaves differently depending on its position:

• In pre-decrement --a, a is decreased first and the new value is used. With a = 7, printf("a=%d", --a) prints 6.
• In post-decrement b--, the current value of b is used first and only then is b decreased. With b = 5, printf("b=%d", b--) prints 5, after which b becomes 4.

A complete, corrected version is:

#include <stdio.h>

int main(void)
{
    int a = 7, b = 5;
    printf("a=%d\n", --a);
    printf("b=%d\n", b--);
    return 0;
}

Output:

a=6
b=5 …