Flow of Control | C++ - C++ Nested if | 11th Computer Science : Chapter 10 : Flow of Control
Chapter: 11th Computer Science : Chapter 10 : Flow of Control
C++ Nested if
Nested if
An if statement contains another if statement is called nested if. The nested can have one of the following three forms.
1. If nested inside if part
2. If nested inside else part
3. If nested inside both if part and else part
The syntax of the nested if:
If nested inside if part
if (expression-1)
{
if (expression)
{
True_Part_Statements;
}
else
{
False_Part_Statements;
}
}
else
body of else part;
If nested inside else part
if (expression-1)
{
body of else part;
}
else
{
if (expression)
{
True_Part_Statements;
}
else
{
False_Part_Statements;
}
}
If nested inside both if part and else part
if (expression)
{
if (expression)
{
True_Part_Statements;
}
else
{
False_Part_Statements;
}
}
else
{
if (expression)
{
True_Part_Statements;
}
else
{
False_Part_Statements;
}
}
In the first syntax of the nested if mentioned above the expression-1 is evaluated and the expression result is false then control passes to statement-m. Otherwise, expression-2 is evaluated,if the condition is true, then Nested-True-block is executed, next statement-n is also executed. Otherwise Nested-False-Block, statement-n and statement-m are executed.
The working procedure of the above said if..else structures are given as flowchart below:
Illustration 10.5 – C++ program to calculate commission according to grade using nested if statement
#include <iostream>
using namespace std;
int main()
{
int sales, commission;
char grade;
cout << "\n Enter Sales amount: ";
cin >> sales;
cout << "\n Enter Grade: ";
cin >> grade;
if (sales > 5000)
{
commission = sales * 0.10;
cout << "\n Commission: " << commission;
}
else
{
commission = sales * 0.05;
cout << "\n Commission: " << commission;
}
cout << "\n Good Job ..... ";
return 0;
}
Output:
Enter Sales amount: 6000
Enter Grade: A
Commission: 600
Good Job .....
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