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//program to demonstrate (-=) operator, a-=2 is same as a=a-2 #include<stdio.h> #include<conio.h> void main() { int a; clrscr(); printf("enter a value for a"); scanf("%d",&a); printf("number you entered is %d",a); a-=2; printf("number after subtracting 2 is %d",a); getch(); }