1. Control Statements_2

2. Programming tasks
Write a program to add an 8% sales tax to a given amount and round the result to the nearest cent.
Write a program to tell if a number is prime.
Write a program that takes a series of numbers and counts the number of positive and negative values.

3. int num,i,count=0;
printf("Enter a number: ");
scanf("%d",&num);
for(i=2;i<=num-1;i++){
if(num%i==0){
count++;
break; }
if(count==0 && num!= 1)
printf("%d is a prime number",num);
else
printf("%d is not a prime number",num);
return 0;

4. Program to find factorial of a number
#include<stdio.h>
#include<conio.h>
void main() {
int n,i,fact=1;
printf(“Enter any no: ”);
scanf(“%d”,&n);
for(i=n;i>=1;i--)
fact=fact*i; }
printf(“Factorial=%d”,fact);
getch();

5. #include <stdio.h>
int main(int numParms, char *parms[]) {
int sumEven;
int sumOdd;
int count;
sumEven = 0;
sumOdd = 0;
for (count=1; count<=5; count++)
if ((count%2)==0)
sumEven += count; }
else
sumOdd += count; }}
printf("The sum of the even values is %d \n", sumEven);
printf("The sum of the odd values is %d \n", sumOdd);
return 0;

6. Scope and Class
All variables have two attributes: scope and class. The scope of a variable is the area of the program in which the variable is valid.
A global variable is valid everywhere (hence the name global), so its scope is the whole program.
A local variable has a scope that is limited to the block in which it is declared and cannot be accessed outside that block.
A block is a section of code enclosed in curly braces ({}).

7. Local and global variables

8. Cont..
You can declare a local variable with the same name as a global variable.
Normally, the scope of the variable count (first declaration) would be the whole program.
The declaration of a second local count takes precedence over the global declaration inside the small block in which the local count is declared.
In this block, the global count is hidden . You can also nest local declarations and hide local variables