try yourself |run 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 increment value of a : %d",a);
 getch();
}

Program Output

Enter value of a: 10
value of a = 11
after increment value of a : 11