Question about nested loops

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C++

Why we need nested loop and what is its purpose

Posted 23-Nov-12 22:42pm

ALIWAZ

Updated 23-Apr-18 4:24am

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OriginalGriff · Accepted Answer · 2012-11-23T22:57:00

You use a nested loop for a lot of reasons: Think about it in real life.
When you read a book, you are using a loop:

foreach page in book
   {
   read page
   }

But reading a page involves a loop as well:

foreach line in page
   {
   read line
   }

And to read a line, you need to read each word. and for each word, you need to read each character.

Computing is the same: you want to do a task, which needs you to loop through items. Each item needs further processing which requires you to loop though smaller portions.

C++

for (i = 0; i < linesCount; i++)
   {
   char* line = lines[i];
   for (j = 0; j < line.Length; j++)
      {
      // Do somethign with each character of the line
      }
   }

CPallini · Accepted Answer · 2012-11-23T23:30:00

Solution 3

As an example, you might find nested loops useful for creating a table:

C

int table[10][10];
for (i=1; i<=10; i++)
 for (j=1; j<=10; j++)
   table[i][j] = i*j;

The above C code creates the classical school multiplication table.

Posted 23-Nov-12 23:30pm

CPallini

Vishal.Shimpi144 · Accepted Answer · 2012-11-23T22:54:00

Solution 1

There is the lots of thing where we need to use nested loop... try the different sorting algorithm in c, c++ in which u must have to use nested loop.
In matrix multiplication also u have to use nested loop.
in short.. you can implement nested loop as per your need.

Posted 23-Nov-12 22:54pm

Vishal.Shimpi144