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for Loop in C: Usage and Examples

Rumman Ansari   Software Engineer   2024-07-04 05:17:57   13262  Share
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A for loop in C is a control flow statement that allows you to iterate over a range of values. It is typically used to execute a block of code a certain number of times, or until a certain condition is met.

In C, you can repeatedly execute a sequence of code in several ways. These looping capabilities are the subject of this chapter, and they consist of the following:

1. The for statement
2. The while statement
3. The do while statement

Syntax of for loop

 
for (initial-action; loop-continuation-condition; action-after-each-iteration) {
// Loop body;
Statement(s);
}
 

 
 for (i = initialValue; i < endValue ; i++) {
  // Loop body;
  Statement(s);
}

Similar Syntax while loop

 
i = initialValue; // Initialize loop control variable
while (i < endValue) {
  // Loop body
  ...
i++; // Adjust loop control variable
}
 

Similar Syntax do while loop

 
i = initialValue; // Initialize loop control variable
do{
// Loop body
...
i++; // Adjust loop control variable
}while (i < endValue) ;

The for loop allows many variations, but its most common form works like this:

The initialization is an assignment statement that is used to set the loop control variable.

The condition is a relational expression that determines when the loop exits.

The increment defines how the loop control variable changes each time the loop is repeated.

You must separate these three major sections by semicolons.The for loop continues to execute as long as the condition is true. Once the condition becomes false, program execution resumes on the statement following the for.

flowchart of the for loop

A for loop performs an initial action once, then repeatedly executes the statements in the loop body, and performs an action after an iteration when the loop-continuation-condition evaluates to true.

Example of for Loop

 #include<stdio.h>
 void main()
 {
    int i;
    for (i = 0; i < 100; i++) {
    printf("Welcome to atnyla! \n");
    }
    
 }

 

The above code is written in C programming language. The code includes a 'for loop' which is used to execute a block of code repeatedly. The 'for loop' starts with the keyword 'for', followed by an initialization statement 'i=0', a termination condition 'i<100', and an increment or decrement statement 'i++' inside the parenthesis. The initialization statement initializes the loop variable 'i' to 0. The termination condition checks whether the loop variable is less than 100, and if it is true, the code inside the loop will execute. The increment statement increments the value of the loop variable by 1 after each iteration of the loop.

The code inside the for loop is "printf("Welcome to atnyla! \n");" which will print the "Welcome to atnyla!" on the screen and '\n' is used to change the line after each execution.

The for loop will execute 100 times, and each time it will print the "Welcome to atnyla!" on the screen.

 Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
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Welcome to atnyla!
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Welcome to atnyla!
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Welcome to atnyla!
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Welcome to atnyla!
Welcome to atnyla!
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Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Welcome to atnyla!
Press any key to continue . . .
 

Example of for Loop

 
 #include<stdio.h>
 void main()
 {  
      int i;
      for(i=1;i<=10;i++){
	     printf("%d \n",i);
	    }
 }
 

1
2
3
4
5
6
7
8
9
10
Press any key to continue . . .

Another Example of for Loop

 
 #include<stdio.h>
 void main()
 {  
      int x;
      for(x = 15; x < 25; x = x + 1) {
         printf("value of x : %d",x);
         printf("\n");
      }
 }
 

value of x : 15
value of x : 16
value of x : 17
value of x : 18
value of x : 19
value of x : 20
value of x : 21
value of x : 22
value of x : 23
value of x : 24
Press any key to continue . . .

MCQ Available

There are 3 MCQs available for this topic.

3 MCQ

Related Assignment

• Assignment 1: do while loop in C Programming language
• Assignment 2: For loop Example Program in C Programming Language
• Assignment 3: Nested For Loop in C
• Assignment 4: for loop with multiple test conditions
• Assignment 5: C program to find the sum of first n natural numbers.
• Assignment 6: Write a program to print the sum of the series 1+2+3+4+... up to n terms.
• Assignment 7: Write a program that prints the sum of digits of a number using for loop.
• Assignment 8: C Program - Write a program to find the factorial of a number using for loop
• Assignment 9: C program to print the multiplication table of 6 from 1 to 10 using for loop.
• Assignment 10: Write a program that prints out a multiplication table.
• Assignment 11: Write a program that will compute the binary equivalent number of a decimal number and print it as output.
• Assignment 12: Write a program that will compute the Fibonacci series and print it as output.
• Assignment 13: Write a program that will search and find out the position where the given key element exist in a user chosen array and print it as output.
• Assignment 14: Nested for Loop in C Programming Language
• Assignment 15: C program break statement in for loop
• Assignment 16: continue statement in for loop
• Assignment 17: C program to print square or rectangle star pattern
  

  *****
  *****
  *****
  *****
  *****
  

• Assignment 18: C program to print square or rectangle star pattern
  

  ********************
  ********************
  ********************
  ********************
  ********************
  

• Assignment 19: C program to print hollow square or rectangle star pattern.

  *****
  *   *
  *   *
  *   *
  *****
  

• Assignment 20: Logic to print hollow rectangle star pattern.

  ***************
  *             *
  *             *
  *             *
  ***************
  

• Assignment 21: C program to print hollow square star pattern with diagonal

  *****
  ** **
  * * *
  ** **
  *****
  

• Assignment 22: C program to print rhombus or parallelogram star pattern

      *****
     *****
    *****
   *****
  *****

• Assignment 23: C program to print hollow rhombus, parallelogram star pattern

      *****
     *   *
    *   *
   *   *
  *****
  

• Assignment 24: C program to print mirrored rhombus, parallelogram star pattern

  *****
   *****
    *****
     *****
      *****
  

• Assignment 25: Program to print mirrored parallelogram star pattern

   
  ********
   ********
    ********
     ********
      ********
       ********
        ********
         ********
          ******** 
  

• Assignment 26: C program to print hollow mirrored rhombus, parallelogram star pattern

  *****
   *   *
    *   *
     *   *
      *****
  

• Assignment 27: Program to print hollow mirrored parallelogram star pattern

  *********
   *       *
    *       *
     *       *
      *       *
       *********
  

• Assignment 28: C program to print right triangle star pattern

  *
  **
  ***
  ****
  *****
  

• Assignment 29: C program to print hollow right triangle star pattern

  *
  **
  * *
  *  *
  *****
  

• Assignment 30: C program to print mirrored right triangle star pattern

      *
     **
    ***
   ****
  *****
  

• Assignment 31: C program to print hollow mirrored right triangle star pattern

      *
     **
    * *
   *  *
  *****
  

• Assignment 32: C program to print reverse right triangle star pattern

  *****
  ****
  ***
  **
  *
  

• Assignment 33: C program to print hollow inverted right triangle star pattern

  *****
  *  *
  * *
  **
  *
  

• Assignment 34: C program to print reversed mirrored right triangle star pattern

  *****
   ****
    ***
     **
      *
  

• Assignment 35: C program to print hollow mirrored inverted right triangle star pattern

  *****
   *  *
    * *
     **
      *
  

• Assignment 36: C program to print Equilateral triangle (Pyramid) star pattern

      *
     ***
    *****
   *******
  *********
  

• Assignment 37: C program to print hollow pyramid (Equilateral triangle) star pattern

      *
     * *
    *   *
   *     *
  *********
  

• Assignment 38: C program to print reverse Pyramid star pattern

   
     *********
     *******
     *****
     ***
      * 
  

• Assignment 39: C program to print hollow inverted pyramid star pattern

  *********
   *     *
    *   *
     * *
      *
  

• Assignment 40: C program to print half diamond star pattern

  *
  **
  ***
  ****
  *****
  ****
  ***
  **
  *
  

• Assignment 41: C program to print hollow diamond star pattern

  **********
  ****  ****
  ***    ***
  **      **
  *        *
  *        *
  **      **
  ***    ***
  ****  ****
  **********
  

• Assignment 42: C program to print mirrored half diamond star pattern

      *
     **
    ***
   ****
  *****
   ****
    ***
     **
      *
  

• Assignment 43: C program to print right arrow star pattern

  *****
    ****
      ***
        **
          *
        **
      ***
    ****
  *****
  

• Assignment 44: C program to print diamond star pattern

      *
     ***
    *****
   *******
  *********
   *******
    *****
     ***
      *
  

• Assignment 45: C program to print left arrow star pattern

       *****
     ****
    ***
   **
  *
   **
    ***
     ****
      *****
  

• Assignment 46: C program to print plus star pattern

      +
      +
      +
      +
  +++++++++
      +
      +
      +
      +
  

• Assignment 47: C program to print X star pattern

  *       *
   *     *
    *   *
     * *
      *
     * *
    *   *
   *     *
  *       *
  

• Assignment 48: C program to print heart star pattern

    ***    ***
   *****  *****
  **************
  *************
   ***********
    *********
     *******
      *****
       ***
        *
  

• Assignment 49: C program to print 8 star pattern

   ****
  *    *
  *    *
  *    *
  *    *
   ****
  *    *
  *    *
  *    *
  *    *
   ****
  

• Assignment 50: C program to print heart star pattern with name in center

    *****     *****
   *******   *******
  ********* *********
  *******atnyla******
   *****************
    ***************
     *************
      ***********
       *********
        *******
         *****
          ***
           *
  

• Assignment 51: C program to print 0 or 1 square number pattern

  11111
  11111
  11111
  11111
  11111
  

• Assignment 52: Program to print number pattern of 1's and 0's at alternate rows

  11111
  00000
  11111
  00000
  11111
  

• Assignment 53: Program to print number pattern with 1, 0

  11111
  00000
  11111
  00000
  11111
  

• Assignment 54: C program to print number pattern with 1, 0 at alternate columns

  10101
  10101
  10101
  10101
  10101
  

• Assignment 55: Program to print number pattern at even/odd columns

  10101
  10101
  10101
  10101
  10101
  

• Assignment 56: C program to print chessboard number pattern with 1 and 0

  10101
  01010
  10101
  01010
  10101
  

• Assignment 57: C program to print box number pattern with 1 and 0

  11111
  10001
  10001
  10001
  11111
  

• Assignment 58: C program to print box number pattern with plus in center

  11011
  11011
  00000
  11011
  11011
  

• Assignment 59: C program to print box number pattern of 1 with 0 center

  11111
  11111
  11011
  11111
  11111
  

• Assignment 60: C program to print box number pattern of 1 and 0 with cross center

  10001
  01010
  00100
  01010
  10001
  

• Assignment 61: C program to print circle box number pattern with 1 and 0

  01110
  10001
  10001
  10001
  01110
  

• Assignment 62: Program to print the given pattern

  11111
  22222
  33333
  44444
  55555
  

• Assignment 63: Program to print the given pattern

  12345
  12345
  12345
  12345
  12345
  

• Assignment 64: Program to print the given pattern

  12345
  23456
  34567
  45678
  56789
  

• Assignment 65: Program to print the given number pattern

  1  2  3  4  5
  6  7  8  9 10
  11 12 13 14 15
  16 17 18 19 20
  21 22 23 24 25
  

• Assignment 66: Program to print number pattern

  55555
  54444
  54333
  54322
  54321
  

• Assignment 67: Program to print the given number pattern

  12345
  23455
  34555
  45555
  55555
  

• Assignment 68: Program to print the given number pattern reverse

  6777777
  5677777
  4567777
  3456777
  2345677
  1234567
   

• Assignment 69: Program to print the given pattern

  12345
  23451
  34521
  45321
  54321
  

• Assignment 70: Program to print the given number pattern

  12345
  21234
  32123
  43212
  54321
  

• Assignment 71: Print perfect square spiral number pattern

  1    2    3    4    5    620   21   22   23   24   719   32   33   34   25   818   31   36   35   26   917   30   29   28   27   1016   15   14   13   12   11 

• Assignment 72: Program to print the given number pattern

  555555555
  544444445
  543333345
  543222345
  543212345
  543222345
  543333345
  544444445
  555555555
  

• Assignment 73: Program to print the given number pattern

  1
  22
  333
  4444
  55555
  

• Assignment 74: Program to print the given number pattern

  55555
  4444
  333
  22
  1
  

• Assignment 75: Logic to print the given number pattern

  55555
   4444
    333
     22
      1
  

• Assignment 76: Program to print the given number pattern

  11111
  2222
  333
  44
  5

• Assignment 77: Logic to print the given number pattern

  11111
   2222
    333
     44
      5
  

• Assignment 78: Program to print the given number pattern

  5
  44
  333
  2222
  11111
  

• Assignment 79: Print the given number pattern

      5
     44
    333
   2222
  11111
  

• Assignment 80: Program to print the given number pattern

  1
  12
  123
  1234
  12345
  

• Assignment 81: Print the given number pattern

      1
     12
    123
   1234
  12345
  

• Assignment 82: Logic to print the given number pattern

• Assignment 83: Logic to print the given number pattern

  12345
   1234
    123
     12
      1
  

• Assignment 84: Logic to print the given number pattern

  1
  21
  321
  4321
  54321
  

• Assignment 85: Logic to print the given number pattern

      1
     21
    321
   4321
  54321
  

• Assignment 86: Program to print the given number pattern

  54321
  4321
  321
  21
  1
  

• Assignment 87: Logic to print the given number pattern

  54321
   4321
    321
     21
      1
  

• Assignment 88: Program to print the given number pattern

  5
  54
  543
  5432
  54321
  

• Assignment 89: Program to print the given number pattern

      5
     54
    543
   5432
  54321
  

• Assignment 90: Program to print the given number pattern

  54321
  5432
  543
  54
  5
  

• Assignment 91: Program to print the given number pattern

  54321
   5432
    543
     54
      5
  

• Assignment 92: Program to print the given number pattern

  5
  45
  345
  2345
  12345
  

• Assignment 93: Program to print the given number pattern

      5
     45
    345
   2345
  12345
  

• Assignment 94: Program to print the given number pattern

  12345
  2345
  345
  45
  5
  

• Assignment 95: Program to print the given number pattern

  12345
   2345
    345
     45
      5
  

• Assignment 96: Program to print the given number pattern

  1
  23
  345
  4567
  56789
  

• Assignment 97: Program to print the given number pattern

      1
     23
    345
   4567
  56789
  

• Assignment 98: Program to print the given number pattern

  56789
  4567
  345
  23
  1
  

• Assignment 99: Program to print the given number pattern

  56789
   4567
    345
     23
      1
  

• Assignment 100: Program to print the odd number pattern

  13579
  3579
  579
  79
  9
  

• Assignment 101: Program to print the odd number pattern with spaces

  13579
   3579
    579
     79
      9
  

• Assignment 102: Check whether a given number is prime or not (using for loop)
• Assignment 103: C Program to Check Armstrong Number
• Assignment 104: C program to find prime factors of a number using for loop

Related Questions

• Question 1: Differentiate between for loop and a while loop? What are its uses?
• Question 2: Explain the syntax for for loop.
• Question 3: What is a nested loop?
• Question 4: Write a loop statement that will show the following output:112123123412345

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