C++ LANGUAGE NESTED LOOPS PAGE 51

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C++ LANGUAGE NESTED LOOPS

nested Loops 


A loop can be nested inside of another loop. C++ allows at 
least 256 levels of nesting. 
Syntax 
The syntax for a nested for loop statement in C++ is as follows: 
for ( init; condition; increment ) 
{ 
   for ( init; condition; increment ) 
   { 
      statement(s); 
   } 
   statement(s); // you can put more statements. 
} 
The syntax for a nested while loop statement in C++ is as follows: 
while(condition) 
{ 
   while(condition) 
   { 
      statement(s); 
   } 
   statement(s); // you can put more statements. 
} 
The syntax for a nested do...while loop statement in C++ is as follows: 
do 
{ 
   statement(s); // you can put more statements. 
   do 
   { 
      statement(s); 
   }while( condition ); 
 
}while( condition ); 
Example 
The following program uses a nested for loop to find the prime numbers from 2 to 100: 
#include <iostream> 
using namespace std; 
  
int main () 
{ 
   int i, j; 
    
   for(i=2; i<100; i++) { 
      for(j=2; j <= (i/j); j++) 
        if(!(i%j)) break; // if factor found, not prime 
        if(j > (i/j)) cout << i << " is prime\n"; 
   } 
   return 0; 
} 
This would produce the following result: 
2 is prime 
3 is prime 
5 is prime 
7 is prime 
11 is prime 
13 is prime 
17 is prime 
19 is prime 
23 is prime 
29 is prime 
31 is prime 
37 is prime 
41 is prime 
43 is prime 
47 is prime 
53 is prime 
59 is prime 
61 is prime 
67 is prime 
71 is prime 
73 is prime 
79 is prime 
83 is prime 
89 is prime 
97 is prime