Decision Making in C++

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Decision making structures helps to the programme evaluate one or more conditions in the program. If the condition is true it executes true statement otherwise it executes the false statement.

  • If Statement
  • If-else Statement
  • Nested If statement
  • Switch Statement
  • Nested Switch Statement
C++ if else flow

If Statement:-

The if statement has a Boolean expression which contains one or more statements. The if condition is true it executes true statement.

if(boolean_expression) {
  /* statements will execute if the boolean expression is true */
}

Example:-

#include <iostream>    
using namespace std;
  
int main(){ 
	int a=10;
	if(a) {   
    	cout << "Print the value of a "<< a << endl; 
    }
   	return 0;      
}
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If-else Statement:-

The if-else statement functions execute code statements if the test expression is true and some other code statements if the test expression is false.

C++ If else statement

Syntax:-

if(boolean_expression) {
	/* statements will execute if the boolean expression is true */
}
else{
	/* statements will execute if the boolean expression is false */
}

Example

#include <iostream>    
using namespace std;
  
int main(){ 
	int a=10,b=15;
	if(a > b) {   
    	cout << "Print the value of a "<< a << endl;
    }
    else{
    	cout << "Print the value of b "<< b << endl; 
    }
   	return 0;    
}
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Nested If Statement:-

Nested If statement is used if or if-else inside another if or if-else.

Syntax:-

#include <iostream> 
using namespace std;
  
int main(){ 
	int a=12,b=7,c=5;
	if(a > b) {   
	    if(a > c){
            cout << "Print the value of a "<< a << endl; 
	    }
	    else{
            cout << "Print the value of c "<< c << endl; 
	    }
    }  
    else{
        if(b > c){
            cout << "Print the value of b "<< b << endl; 
        }
         else{
            cout << "Print the value of c "<< c << endl; 
         }
    }
   	return 0;  
}
Run ›
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