For Loop in c Programming Examples

C programming for loop; Through this tutorial, you will learn how to use for loop in C programming with examples.

C Programming For Loop

• Definition of For Loop
• Syntax of for loop in c
• Example 1 – C program to print 1 to 10 numbers using for loop
• Example 2 – C program to print even numbers from 1 to 10 using for loop
• Example 3 – C program to print odd numbers from 1 to 10 using for loop

Definition of For Loop

In C programming, a for loop is used to repeat a block of statements until a specified condition is satisfied. And It is also known as an entry-controlled loop.

Syntax of for loop in c

The syntax of for loop in c; as shown below:

for (initializationStatement; testExpression; updateStatement)
{
    // statements inside the body of loop
}

Explanation of above given c for loop syntax

• In For loop itetartion; Initialization statement is executed only once.
• Then test expression is evaluated to true, statements inside the body of the for loop are executed, and the update expression is updated.
• OR test expression is evaluated. If the test expression is evaluated to false, the for loop is terminated.
• Again the test expression is evaluated.
• This process goes on until the test expression is false. When the test expression is false, the loop terminates.

Example 1 – C program to print 1 to 10 numbers using for loop

See the following c program to print 1 to 10 number using for loop; as shown below:

// Print numbers from 1 to 10
#include <stdio.h>

int main() {
  int i;

  for (i = 1; i < 11; ++i)
  {
    printf("%d ", i);
  }
  return 0;
}

Output

1 2 3 4 5 6 7 8 9 10

Explanation of above c program to print 1 to 10 number using for loop

• Initialized i variable with value 1.
• Intialized body of for loop with test condition.
• Inside for loop; print i value. And The body of for loop is executed, until test condition is met true.
• Update statement ++i is executed and the test expression i < 11 is evaluated.
• This process goes on until i becomes 11.
• When test condition will be false, and the for loop terminates.

Example 2 – C program to print even numbers from 1 to 10 using for loop

See the following c program to print even numbers from 1 to 10 using for loop; as shown below:

#include<stdio.h>
 
int main()
{
  	int i;
  	int  number = 10;
 
  	printf("\n The even number from 1 to 10 : ");
  
  	for(i = 1; i <= number; i++)
  	{
    	if ( i % 2 == 0 ) 
    	{
  			printf(" %d\t", i);
    	}
  	}
 
  	return 0;
}

Output

The even number from 1 to 10 :  2	 4	 6	 8	 10

Explanation above C program to print even numbers from 1 to 10 using for loop

• Initialized i variable with value 1.
• Initialized number variable with value 10.
• Iterate body of for loop until the condition met true else terminate for loop exection.
• Inside for loop body; use i%2 ==0 test condition to find even number from 1 to n and print it.

Example 3 – C program to print odd numbers from 1 to 10 using for loop

See the following c program to print odd numbers from 1 to 10 using for loop; as shown below:

#include<stdio.h>
 
int main()
{
  	int i;
  	int  number = 10;
 
  	printf("\n The odd number from 1 to 10 : ");
  
  	for(i = 1; i <= number; i++)
  	{
    	if ( i % 2 != 0 ) 
    	{
  			printf(" %d\t", i);
    	}
  	}
 
  	return 0;
}

Output

The odd number from 1 to 10 :  1	 3	 5	 7	 9

Explanation above C program to print odd numbers from 1 to 10 using for loop

• Initialized i variable with value 1.
• Initialized n variable with value 10.
• Iterate body of for loop until the condition met true else terminate for loop exection.
• Inside for loop body; use i%2 !=0 test condition to find odd number from 1 to n and print it.