Simple if Statement

[raj21]

I created two programs (Number 1 and Number 2) using simple if statements. As you know there are two way to create program using simple if statements, syntax are:

A. if (condition)
       Statement;


B. if(condition)
    {
      Block of statements;
    }

My both programs are same except i used set brackets in number 2 and I didn't use set brackets in number 1 but both codes are working fine. Is it not necessary to use set brackets when we write "block of statements" ?
I also want to know a live example of "Block of Statements" I know that when we use more than one statement within set brackets that is called Block of Statements.

if(gross_salary>=10000)
        {
                tax = gross_salary*0.15;
            net_salary = gross_salary - tax;
        }

is above one has example of "Block of statements" ?

Below are my both programs

//Number 1
/* Program to calculate the net Salary of an employee */
#include<stdio.h>
int main()
{
    float tax, gross_salary, net_salary;
    printf(" Enter Gross Salary of Employee: ");
    scanf("%f", &gross_salary);
    printf(" Employee Gross Salary %9.2f\n", gross_salary);
    if(gross_salary<10000)
        net_salary=gross_salary;
    if(gross_salary>=10000)
        tax = gross_salary*0.15;
        net_salary = gross_salary - tax;
    printf(" Tax: %26.2f", tax);
    printf("\n Net Salary Rs. %16.2f\n", net_salary);
}

// Number 2
/* Program to calculate the net Salary of an employee */
#include<stdio.h>
int main()
{
    float tax, gross_salary, net_salary;
    printf(" Enter Gross Salary of Employee: ");
    scanf("%f", &gross_salary);
    printf(" Employee Gross Salary %9.2f\n", gross_salary);
    if(gross_salary<10000)
        net_salary=gross_salary;
    if(gross_salary>=10000)
        {
                tax = gross_salary*0.15;
            net_salary = gross_salary - tax;
        }
    printf(" Tax: %26.2f", tax);
    printf("\n Net Salary Rs. %16.2f\n", net_salary);
}

[laserlight]

Is it not necessary to use set brackets when we write "block of statements" ?

If you omit the braces then the body of the if statement would be just one statement. As an example, consider:

#include <stdio.h>

int main(void)
{
    int n = 0;

    if (n != 0)
        printf("#1\n");
        printf("#2\n");

    if (n != 0)
    {
        printf("#3\n");
        printf("#4\n");
    }

    return 0;
}

If you compile and run the above program, you will find that "#2" is printed even though the statement to print "#2" was indented as if it were part of the body of the first if statement. So, it is usually better to have the braces even when they are not necessary.

is above one has example of "Block of statements" ?

Yes.

[raj21]

#include<stdio.h>
main()
{
    puts("My doubts");
    system("cls");
    puts("Thanks");
}