C++ LANGUAGE FOR LOOP PAGE 49

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C++ LANGUAGE FOR LOOP

for Loop 


A for loop is a repetition control structure that allows you 
to efficiently write a loop that needs to execute a specific 
number of times. 
Syntax 
The syntax of a for loop in C++ is: 
for ( init; condition; increment ) 
{ 
   statement(s); 
} 
Here is the flow of control in a for loop: 

1. The init step is executed first, and only once. This step 
Allows you to declare and initialize any loop control variables. 
You are not required to put a statement here, as long as a 
semicolon appears. 

2. Next, the condition is evaluated. If it is true, the body of 
the loop is executed. If it is false, the body of the loop does 
not execute and flow of control jumps to the next statement just 
after the for loop. 

3. After the body of the for loop executes, the flow of control 
jumps back up to the increment statement. This statement allows 
you to update any 



loop control variables. This statement can be left blank, as 
long as a semicolon appears after the condition. 

4. The condition is now evaluated again. If it is true, the 
loop executes and the process repeats itself (body of loop, 
then increment step, and then again condition). After the 
condition becomes false, the for loop terminates. 

Example 
#include <iostream> 
using namespace std; 
  
int main () 
{ 
   // for loop execution 
   for( int a = 10; a < 20; a = a + 1 ) 
   { 
       cout << "value of a: " << a << endl; 
   } 
  
   return 0; 
} 
When the above code is compiled and executed, 
it produces the following result: 

value of a: 10 
value of a: 11 
value of a: 12 
value of a: 13 
value of a: 14 
value of a: 15 
value of a: 16 
value of a: 17 
value of a: 18 
value of a: 19