C programming language: C program to subtract two numbers (Mathematics operation).

//Normal program
#include<stdio.h>

#include<conio.h>

void main()

{

int a=20,b=10;

printf("%d",a-b);

getch();

}

output:- 10

//Ask number from user to Subtract

#include<stdio.h>
#include<conio.h>
void main()
{
int a,b,c;
printf("Enter No to subtract: ");
scanf("%d %d",&a,&b);
c=a-b;
printf("Subtraction= %d",c);
getch();
}